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Grade 09 CHM 41
Chapter 1 - More Practice Sheet
Topic 1 Practice Questions QP
Subtopic 1.1 Elements, Mixtures & Compounds
1. Which of the following is/are example(s) of
matter?
A.
Fog
B.
Lamp
C.
Helium gas
D.
All of the above
Consider the following particulate diagrams
to answer questions 5 and 6.
5. Which of the above figures is/are
considered a mixture?
2. All of the following are polyatomic
elements except ____________.
A.
Zn
B.
S8
C.
O3
D.
P4
A.
K only
B.
M only
C.
L and M only
D.
K, L and M
6. Which of the above diagrams is a pure
substance?
3. Which of the following is a polyatomic
element?
A.
L only
A.
S8
B.
M only
B.
I2
C.
K and L only
C.
Ne
D.
K, L and M
D.
Cu
____________________________________________________
4. Which of the following is a diatomic
element?
7. Tap water is an example of a(n) ______.
A. element
A.
S8
B.
pure substance
B.
P4
C.
homogenous mixture
C.
Xe
D.
heterogeneous mixture
D. I2
___________________________________________________
Topic 1 Practice Questions QP
1
Grade 09 CHM 41
8. Which of the following is a heterogeneous
mixture?
A.
Air
B.
Water
C.
Alloy
D.
Sea water
Use the following diagram to answer
questions 11 and 12.
______________________________________________________
11. Which of the above diagrams represents a
compound?
Use the following diagram to answer
questions 9 and 10.
9. Which of the following best describes
Figure A?
A.
W
B.
X
C.
Y
D.
Z
12. Which of the above diagrams represents a
mixture of an element and a compound?
A.
Element
A.
W
B.
Mixture
B.
X
C.
Solution
C.
Y
D.
Compound
D.
Z
13. Matter is best described as anything that
has _________________ only.
10. Which of the following statements is true?
A.
Figure B is composed of two
different compounds
B.
Figure C is composed of two
different compounds
C.
Figure C is composed of three
different types of elements
D.
All of the above
A.
mass
B.
mass and velocity
C.
mass and takes up space
D.
mass, density and exerts pressure
______________________________________________________
Topic 1 Practice Questions QP
2
Grade 09 CHM 41
14. Which of the following is/are properties of
a pure substance?
I.
Chemically inert
II.
Has a fixed composition
III.
Can be an element or a compound
18. Which of the following represents a
mixture of three different elements?
A.
X only
B.
Y only
A.
I only
C.
Z only
B.
I and II only
D.
X and Y only
C.
II and III only
D.
I, II and III
________________________________________________
Use the following diagram to answer
questions 19 and 20.
Consider the following diagrams to answer
questions 15 18.
19. Which of diagram represents(s) an
element?
15. Which of the diagrams (X, Y and Z)
represent(s) homogenous mixture?
A.
B.
C.
D.
X only
Y only
X and Y only
Y and Z only
16. Which of the diagrams (X, Y and Z)
represent(s) pure element?
A.
B.
W only
Z only
C.
X and Z only
D.
X, Y and Z only
20. Which of diagram represents(s) a
compound?
Z only
A.
B.
W only
Z only
C.
X and Y only
C.
X and Z only
D.
Y and Z only
D.
X, Y and Z only
A.
X only
B.
______________________________________________________
17. Which of the following could be Z?
A.
Water
B.
Salt and water
C.
Hydrogen gas
D.
Phosphorous
Topic 1 Practice Questions QP
3
Grade 09 CHM 41
21. Which of the following is/are example(s) of
an element?
I.
S8
II.
Fe
III.
Cl2
A.
B.
C.
D.
24. Which of the above particulate diagrams
represents carbon dioxide, CO2, molecules?
I only
II only
I and II only
I, II and III
A.
X only
B.
Y only
C.
Z only
D.
X and Y only
25. Which diagram(s) represent(s) a pure
substance?
______________________________________________________
Consider the following particulate diagrams
(X, Y and Z) to answer questions 22 25.
A.
X only
B.
Y only
C.
Y and Z only
D.
X, Y and Z
______________________________________________________
26. All of the following substances are elements
except _________.
22. Which diagram represents helium, He,
atoms?
A.
X only
B.
Y only
C.
Z only
D.
X and Y only
mixture
B.
element
C.
compound
D.
pure substance
Topic 1 Practice Questions QP
water
B.
oxygen
C.
chlorine
D.
nitrogen
27. Which of the following is not a compound?
23. Diagram X represents a(n) _______________.
A.
A.
A.
O2
B.
CO
C.
CO2
D.
NO
28. Bronze is considered as a __________.
4
A.
pure element
B.
pure compound
C.
homogenous mixture
D.
heterogeneous mixture
Grade 09 CHM 41
29. Air is a ________ mixture in which different
substances are _______ mixed.
A.
heterogeneous
evenly
B.
heterogeneous
not evenly
C.
homogeneous
not evenly
D.
homogeneous
evenly
Use the following particulate diagram to
answer questions 33 and 34.
33. The particulate diagram that represents a
heterogeneous mixture is ________ because
the components are _______ mixed.
30. Sea water is a _______ mixture in which
different substances are ______ mixed.
A.
heterogeneous
evenly
B.
heterogeneous
not evenly
C.
homogeneous
evenly
D.
homogeneous
not evenly
I only
B.
II only
C.
I and II only
D.
I, II and III
N
not evenly
B.
Q
evenly
C.
W
evenly
D.
Q
not evenly
34. The particulate diagram that represents a
homogeneous mixture is _______ because
the components are _________ mixed.
A.
N
not evenly
31. Which of the following mixtures is/are
heterogeneous?
I.
Sand and water
II.
Orange juice with pulp
III.
Sodium chloride dissolved in water
A.
A.
B.
Q
evenly
C.
W
evenly
D.
Q
not evenly
___________________________________________________
32. Which of the following is/are correct
safety precaution(s) when heating
flammable liquids?
I.
Use a hot plate
II.
Wear safety goggles
III.
Always tie any long hair
A.
B.
I only
II only
C.
I and III only
D.
I, II and III
Topic 1 Practice Questions QP
5
Grade 09 CHM 41
35. Classify each of the following diagrams as element, mixture or compound. If any is a mixture
specify its type.
______________________
______________________
______________________
______________________
______________________
______________________
36. Classify the following as pure substance, homogeneous mixture or heterogeneous mixtures.
a) Air
__________________________________________
b) Carbon dioxide
__________________________________________
c) Distilled water
__________________________________________
d) Sand and water
__________________________________________
e) Vinegar and water
__________________________________________
f) Table salt
__________________________________________
g) Blood
__________________________________________
h) Brass
__________________________________________
Topic 1 Practice Questions QP
6
Grade 09 CHM 41
37. Consider the following particulate diagrams to answer questions a c.
a) Write the letter (P, R, S, T or U) that matches each of the following statements.
(Each letter may be used once, more than once or not at all)
A mixture of an element and a compound
_________________
A mixture of more than one element
_________________
A heterogeneous mixture
_________________
A pure element
_________________
b) Which letter (P, R, S, T or U) represents a homogeneous mixture? Explain your answer.
c) Which letter (P, R, S, T or U) represents a pure compound? Justify your answer.
38. Use the particulate diagrams below to identify the letter (Q, R, S, T or U) that best fits each of the
following statement.
(Each letter may be list once, more than once or not at all)
a) These are elements
____________________
b) This is a solution
____________________
c) This is a compound
____________________
Topic 1 Practice Questions QP
7
Grade 09 CHM 41
39. Use the following figure to identify the letter (A I) that fits each of the following.
(Each letter may be used once, more than once or not at all)
Element
________________
Compound
________________
Mixture
________________
Mixture of a monoatomic element and a diatomic element
________________
This could be a mixture of He and H2
________________
This could be H2O
________________
This could be N2
________________
This could be a mixture of Na and HCl
________________
Topic 1 Practice Questions QP
8
Grade 09 CHM 41
40. Consider the three different substances given below to answer questions a c.
(Each substance may be used once, more than once or not at all)
a) Which of the above is/are pure substance(s)?
b) Which of the above is an element?
c) A student predicted that sea water is a heterogeneous mixture. Is the student correct? Justify
your answer.
41. Write the name of the laboratory equipment needed for each of the following.
Used to provide heat
_________________
Used to hold an evaporating dish
_________________
Important eye equipment for lab work
_________________
Used to transfer small amounts of solid
_________________
Used to measure volume of liquid accurately
_________________
You must always wear these to protect your hands
_________________
Used to hold solids or liquids and carry out reactions
_________________
Topic 1 Practice Questions QP
9
Grade 09 CHM 41
42. In the table below, write the name of the laboratory equipment that is needed for each of the
following uses.
Name of Laboratory
Equipment
Use
Protects the eyes from flying objects or chemical
splashes
A wide-mouthed container used to transport, heat or
store substances
P ec he cie i a d he cie i
cl he f
hazardous or hot chemicals
Used to dispense a very small amount of a liquid
Used to pour liquids into containers with small
openings or to hold filter paper
43. A student found the following labels on a bottle in the Chemistry lab. Write the name of each
hazard sign.
______________________
Topic 1 Practice Questions QP
______________________
10
______________________
Grade 09 CHM 41
44. On a school day, a Grade 09 student had a chemistry class in his chemistry lab. He shared with his
parents his experience during that day. Unfortunately, there were some mistakes in his actions
during the chemistry lab.
Read the passage below and identify the mistakes of the students. Propose a correct action for
each mistake the student have done.
Today I had a chemistry class. The teacher took us to the chemistry lab. I forgot my lab coat that day.
When we went to the lab, I put on my gloves and I wore my eye goggles although I was wearing my
lenses. The teacher asked us to carry out an experiment were we have to heat a liquid over the
Bunsen burner. My colleague and I collected the apparatus needed: Test tube, tongs, and Bunsen
burner. My colleague took a test tube and completely filled it with the liquid to be heated. He heated
it vertically over the Bunsen burner without moving it. After a while the liquid started splashing out
of the test tube and some drops came on my colleague hand. He quickly wiped it with a tissue. The
teacher then came to us and told us that we have done some mistakes during the lab that she needs
to discuss this with us later.
Incorrect Action 1: _______________________________________________________________________________________.
Correction: ________________________________________________________________________________________________.
Incorrect Action 2: _______________________________________________________________________________________.
Correction: ________________________________________________________________________________________________.
Incorrect Action 3: _______________________________________________________________________________________.
Correction: ________________________________________________________________________________________________.
Incorrect Action 4: _______________________________________________________________________________________.
Correction: ________________________________________________________________________________________________.
Incorrect Action 5: _______________________________________________________________________________________.
Correction: ________________________________________________________________________________________________.
Topic 1 Practice Questions QP
11
Grade 09 CHM 41
45. Identify five safety hazards in the figure below from a lab.
Topic 1 Practice Questions QP
12
Grade 09 CHM 41
46. Name the lab apparatus or equipment that fits each of the following functions.
Suitable Lab Apparatus or
Equipment
Function
o Used to hold crucibles or hot objects
o Protects the eyes from flying objects or chemical splashes
o Used to heat objects
o Used to pour liquids into containers with small openings or
to hold filter paper
o A small glass container used to view chemical reactions or to
heat small amounts of a substance
o A wide-mouthed container used to transport, heat or store
substances; not reliable for accurate volume measurement
o A narrow-mouthed container used to transport, heat or store
substances, often used when a stopper is required
47. Name the apparatus that can be used to perform each of the following task.
Suitable Lab
Apparatus
Function
o Holding 120. mL of water
o Measuring 27 mL of a liquid
o Measuring exactly 34 mL of an acid
o Measuring out 130 g of sodium chloride
o Mixing small amount of solids together
o Holding many test tubes filled with chemicals
Topic 1 Practice Questions QP
13
Grade 09 CHM 41
48. Decide whether each of the following statements is true (T) or false (F).
o While people who participate in extreme sports must think about safety all
the time, scientists never need to consider it.
__________
o Long, loose hair and lots of dangling jewelry is appropriate chemistry lab
attire
__________
o A messy workspace is safer, and may give you inspiration to do good
science work
__________
o It is very important to always follow directions.
__________
o Glassware is fragile, so you should be sure to place it away from the edge of
the table to prevent it from being knocked over.
__________
o Gloves help protect your hands from harmful substances.
__________
o It is best to assume that glassware is never hot, because it does not appear
hot.
__________
o Science labs are rarely equipped with fi re extinguishers, because fires do
not happen in science labs.
__________
Topic 1 Practice Questions QP
14
Grade 09 CHM 41
49. During the practical lesson in a Chemistry laboratory, the students must wear specific safety
clothes and they use different laboratory glassware or equipment. Complete the following table by
writing the missing name or its use.
Laboratory Equipment
Name
Use
Used to hold solids or liquids and
carry out reactions
Important eye equipment for lab
work
Pipette
Used to transfer small amounts of
solid
Used to provide heat
Topic 1 Practice Questions QP
15
Grade 09 CHM 41
Subtopic 1.2 Properties of Matter
1. Which of the following is/are physical
property?
I.
Conductivity
II.
Flammability
III.
Boiling point
A.
I only
B.
II only
C.
III only
D.
I and III only
4. Consider the following reaction:
W+Z
WZ. If 35.0 g of W combines
completely with Z to form 60.0 g of WZ,
what is the mass of Z needed?
Silver metal reacts with acids
B.
Sugar turning into brown solid
when heated
C.
Aluminum can be hammered
into thin sheets
D.
Sodium reacts vigorously when
dropped in water
25.0 g
B.
35.0 g
C.
60.0 g
D.
95.0 g
5. The figures below represent the particulate
diagrams of two different changes X and Y.
Which of the following correctly identifies
the changes X and Y?
2. Which of the following is not a chemical
property?
A.
A.
3. Hydrogen combines with nitrogen to form
ammonia. Which of the following correctly
lists the reactants and products of this
reaction?
A.
Reactant(s)
Product(s)
Hydrogen
Nitrogen
and
ammonia
Nitrogen
and
Hydrogen
Hydrogen
B.
Ammonia
C.
Nitrogen and
ammonia
D.
Nitrogen and
hydrogen
Topic 1 Practice Questions QP
Ammonia
16
X
Y
A.
Physical change
Chemical change
B.
Chemical change
Physical change
C.
Physical change
Physical change
D.
Chemical change
Chemical change
Grade 09 CHM 41
13. Which of the following indicates that a
chemical reaction occurred?
I.
The temperature of mixture
increased by 21℃
II.
The color of a solution changed from
orange to green
III.
A solid substance is formed after
mixing two solutions
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
16. Which of the following is/are considered
physical change(s)?
I.
Rusting of iron
II.
Evaporation of water
III.
Crushing salt crystals
I only
I and II only
C.
I and III only
D.
I, II and III
Cutting a sheet of paper
C.
Crushing an aluminum can
D.
Reacting carbon with
oxygen to form carbon
dioxide
B.
II only
C.
III only
D.
II and III only
A.
I only
B.
II only
C.
I and II only
D.
I, II and III
18. All of the properties below are physical
except _______________.
15. Which of the following is not a physical
change?
A.
Breaking a conical flask
B.
I only
17. Which of the following is/are considered
chemical change(s)?
I.
Rusting of iron
II.
Burning a candle
III.
Crushing salt crystals
14. A chemical reaction is a process that
involves ___.
I.
formation of new substances
II.
rearranging the atoms in the
reactants
III.
changing the type of atoms in the
reactants
A.
B.
A.
A.
odor
B.
color
C.
density
D.
flammability
19. Which of the following is a physical
property?
A.
B.
C.
D.
Topic 1 Practice Questions QP
18
Color
Combustion
Flammability
Reactivity with water
Grade 09 CHM 41
25. A student listed different properties of a substance in his lab report. Classify each of the following
as physical or chemical properties.
Is a gas
Flammable
Is colorless
Highly reactive
Has low boiling point
Complete the diagram below by adding the property in the correct place.
Physical Property
Chemical Property
26. A substance is formed from its component elements according to the following reaction:
X+Y
XY. Answer questions a c.
a) If 45.0 g of substance X reacts with substance Y to form 74.0 g of XY. What is the mass of B?
(You must show all your work to earn the full mark)
b) List and define the law that governs the above chemical reaction.
c) Identify the reactant(s) and product(s).
Reactant(s)
____________________________
Product(s)
____________________________
Topic 1 Practice Questions QP
20
Grade 09 CHM 41
27. Classify each of the following statements as a chemical property or a chemical change.
Gold is an unreactive metal
______________________________
Gasoline is a highly flammable liquid
______________________________
Zinc reacts with an acid to produce
hydrogen gas
______________________________
Magnesium burns in oxygen to produce a
bright white flame
______________________________
Sodium reacts with water to produce
bubbles of hydrogen gas
______________________________
28. Classify each of the following changes as physical or chemical change. For each chemical change
list one indication or evidence of the chemical change.
a) 10.0 g of salt dissolves readily in 100 ml water.
b) Aluminum metal can be hammered into thin sheets.
c) Charcoal burns in a grill.
29. Classify each of the following changes as a chemical change (C) or a physical change (P).
a) Evaporation of alcohol
______________________________
b) Crushing crystals of a solid
______________________________
c) Burning gasoline in car engine
______________________________
Topic 1 Practice Questions QP
21
Grade 09 CHM 41
35. Complete the diagram below by writing the letter of statements (Q, L, M or N) in the correct circle.
Q
Iron melts at 538℃
L
Grinding a piece of solid speeds up the reaction
M
Magnesium ribbon can be cut down into smaller pieces
N
Potassium reacts with water and produces hydrogen gas
Topic 1 Practice Questions QP
25
Grade 09 CHM 41
36. Read the following passage and use your knowledge about physical and chemical properties and
changes as well as intensive and extensive properties to answer questions a and b.
Sodium is a chemical element with the chemical symbol Na and atomic number 11. Compared to other
metals, sodium is soft and have a silvery white color, melts at 97.8 C and boils at 882.9 C and has a
density of 0.968 g/cm3.
Sodium is a highly reactive metal. It reacts violently with water where hydrogen gas is produced.
Sodium hardly reacts with carbon, but it does react with halogens to form sodium salts.
Sodium is the sixth most abundant element in he Ear h s cr s Sodi m is af er chloride he second
most abundant element dissolved in seawater.
a)
b)
i.
List two physical properties of sodium.
ii.
List two chemical properties of sodium.
i.
Write one intensive property of sodium.
ii.
List from the above paragraph one indicator of a chemical change.
Topic 1 Practice Questions QP
26
Grade 09 CHM 41
37. Read the following passage about sulfur then answer questions a c.
Sulfur element is an odorless, tasteless, light yellow solid at room temperature. It melts at 115 C,
boils at 444 C and has a density of 2.07g/cm3. Solid sulfur is combustible and molten sulfur is
flammable. Also, sulfur is a reactive element that can combine with many other elements except gold
and platinum.
a) List two physical properties of sulfur.
1) _____________________________________________________________
2) _____________________________________________________________
b) List two chemical properties of sulfur.
1) _____________________________________________________________
2) _____________________________________________________________
c) When burning sulfur in the presence of oxygen, a gas will be produced. Is this change physical
or chemical? Justify your answer.
Topic 1 Practice Questions QP
27
Grade 09 CHM 41
Subtopic 1.3 States of Matter
Consider the following particulate diagrams
Q and P to answer questions 1 and 2.
1. Which of the following correctly states that
state of P and Q?
A.
P is solid and Q is gas
B.
P is gas and Q is liquid
C.
P is liquid and Q is gas
D.
Both P and Q are gases
I only
B.
II only
C.
I and II only
D.
II and III only
Topic 1 Practice Questions QP
A.
I only
B.
II only
C.
III only
D.
I, II and III
4. Deposition is the change of state from _______
to ________.
2. Which of the following is true about P and
Q?
I.
Particles in P are compressible
II.
Particles in P have regular
arrangement
III.
Particles in Q have low density and
can be compressed
A.
3. Which of the following is/are true of
gases?
I.
Indefinite shape
II.
Indefinite volume
III.
High compressibility
A.
solid
liquid
B.
liquid
gas
C.
gas
liquid
D.
gas
solid
5. Solid has a(n) __________________.
A.
indefinite shape
B.
indefinite volume
C.
high compressibility
D.
regular arrangement of particles
6. Which of the following best describes
hydrogen gas?
28
A.
Low density
B.
Has a definite volume
C.
Particles slide past one another
D.
Regular arrangement of particles
Grade 09 CHM 41
13. Methane, CH4, has a melting point and
boiling point below 0℃. Methane is
expected to be a _______ at room
temperature.
A.
gas
B.
solid
C.
liquid
D.
plasma
15. During the process of ____________, heat is
________ a sample of a solid to change it to a
liquid.
A.
melting
added to
B.
melting
removed from
C.
freezing
added to
D.
freezing
removed from
14. During the process of ____________, heat is
________ a sample of solid to change it to a gas.
A.
sublimation added to
B.
sublimation removed from
C.
deposition
D.
evaporation removed from
added to
16. Use the following table to compare between the three states of matter in terms of shape, volume,
and compressibility.
State of matter
Solid
Liquid
Gas
Shape
Volume
Compressibility
Topic 1 Practice Questions QP
30
Grade 09 CHM 41
17. Consider the following particulate diagram to answer questions a and b.
a) Which letter represents the change that occurs by:
Addition of heat
________________
Removal of heat
________________
b) List the letter that best fits each of the following statements.
The state in which particles are highly compressible
________________
The state in which particles can slide past one another
________________
The state in which particles are closely packed together
________________
Evaporation
________________
Sublimation
________________
Deposition
________________
18. Identify the state of matter: solid, liquid or gas, that best fits each of the following statements.
a) Has an indefinite shape and definite volume
______________
b) Its particles vibrate in their fixed positions
c) Its particles have irregular arrangement and move
randomly
______________
Topic 1 Practice Questions QP
31
______________
Grade 09 CHM 41
21. For each of the following changes of state, identify the initial and final state of matter and
whether heat is added or removed.
Change of state
Initial State of Matter
Final State of Matter
Heat Added or
Removed
a) Melting
b) Deposition
c) Condensation
22. A student was asked to write in his Chemistry copybook about the three states of matter. Read the
following paragraph and identify TWO errors in the paragraph below and write the correct
statements.
Matter has only two main states: solid and liquid. A solid has a definite shape but an indefinite
volume. A liquid is highly incompressible and has regular arrangement of particles.
a) Error 1: ___________________________________________________________________________________________________
Correct statement 1: _____________________________________________________________________________________
b) Error 2:
_____________________________________________________________________________________________
Correct statement 2: ____________________________________________________________________________________
Topic 1 Practice Questions QP
33
Grade 09 CHM 41
39. Use the diagram below that represents three states of matter to identify the state of matter (X, Y
or Z) that best fits each of the following statements.
(Each letter may be used once, more than once, or not at all)
a) The state of matter with a definite shape
______________
b) The state of matter that has the highest density
______________
c) The state of matter that is highly compressible
______________
d) Particles in this state of matter slide past each other
______________
Topic 1 Practice Questions QP
36
Grade 09 CHM 41
Subtopic 1.4 Separation techniques
1. Which of the following separation
techniques can be used to separate an
insoluble solid from a liquid?
I.
Filtration
II.
Fractional distillation
III.
Using separating funnel
A.
I only
B.
II only
C.
III only
5. The diagram below represents ______________,
where oil is __________ than water that is why
it can be separated from a mixture of oil
and water at the end.
D.
I and II only
_____________________________________________________
2. Consider the following figure to answer
questions 2 and 3.
A.
filtration
denser
B.
separatory funnel
lighter
C.
separatory funnel
denser
D.
filtration
lighter
6. A mixture of solid ammonium chloride and
solid sodium chloride can be separated by
____________.
3. What is the name of the above separation
technique?
A.
Filtration
B.
Distillation
A.
filtration
C.
Decantation
B.
decantation
D.
Centrifugation
C.
sublimation
D.
centrifugation
4. What are the physical states of substance R
and T?
R
T
A.
Liquid
Solid
B.
Solid
Solid
C.
Solid
Liquid
D.
Liquid
Liquid
______________________________________________________
Topic 1 Practice Questions QP
37
Grade 09 CHM 41
7. The separation method in the diagram
below can best be used to separate_________.
A.
a mixture of oil and water
B.
a mixture of water and
ethanol
a mixture of sulfur and
iron
copper sulfate crystals
from copper sulfate
solution
C.
D.
Use the diagram below to answer questions
8 10.
9. This separation technique represented by
the diagram above is called _______________.
8. Which of the following statements is/are
true about the separation technique
represented below?
A.
filtration
B.
centrifugation
C.
simple distillation
D.
fractional distillation
10. In K ______ takes place and in M _______ takes
place.
Liquid V is denser than liquid W
It is used to separate two immiscible
liquids
It can be used to separate a mixture
of kerosene oil and water
I.
II.
III.
A.
I only
B.
II only
C.
I and II only
D.
II and III only
Topic 1 Practice Questions QP
A.
evaporation
deposition
B.
evaporation
condensation
C.
condensation
evaporation
D.
deposition
condensation
11. The laboratory equipment L is called a
______________.
A.
beaker
B.
burette
C.
cylinder
D.
Florence flask
______________________________________________________
38
Grade 09 CHM 41
12. The process of separation of insoluble
materials from a liquid where normal
filtration does not work well is called
________________.
A.
chromatography
B.
centrifugation
C.
distillation
D.
filtration
Use the diagram below to answer questions
14 16.
13. The separation technique in the diagram
can best be used to separate a mixture of
____________.
A.
sand and water
B.
alcohol and water
C.
camphor and water
D.
table salt and water
15. The separation technique in the diagram
above can be used to separate _________.
A.
oil and water
B.
water and ethanol
C.
immiscible liquids
D.
different components in a
liquid mixture
16. Dye ___________ is most soluble in the solvent
and dye __________ is the least soluble in the
solvent.
A.
1
2
14. The separation technique in the diagram
can best be used to separate a mixture of
____________.
B.
1
3
C.
3
1
D.
3
2
17. Which dye(s) is/are present in the mixture?
I.
Dye 1
II.
Dye 2
III.
Dye 3
A.
I only
A.
oil and water
B.
ethanol and water
B.
II only
C.
liquids of different colors
C.
III only
D.
I and III only
______________________________________________________
D.
blood components
______________________________________________________
Topic 1 Practice Questions QP
39
Grade 09 CHM 41
18. Which of the following separation
techniques can be used to separate two or
more miscible liquids with close boiling
points?
A.
Centrifugation
B.
Chromatography
C.
Simple distillation
D.
Fractional distillation
_____________________________________________________________________________________________________________________
19. Identify the separation technique that can best separate each of the following mixtures.
a) Iron and sulfur
_________________________
b) Oil and water
_________________________
c) Iodine from a mixture of iodine and sand
_________________________
Topic 1 Practice Questions QP
40
Grade 09 CHM 41
20. Salt is soluble in water, but sand is insoluble in water. This difference allows a mixture of salt and
sand to be separated using this apparatus. Answer questions a – c.
a) Use words from the box below to complete the sentences.
(Each word may be used once, more than once or not at all)
beaker
funnel
burette
water
glass rod
thermometer
Bunsen burner
conical flask
In Step 1, the mixture of salt and sand is placed in a ____________________________ containing
_____________________________ and stirred with a ______________________.
In Step 2, the mixture from Step 1 is poured through a _____________________________ into a
_____________________________.
In Step 3, the liquid is transferred to a basin to allow the. ____________________________ to be
removed.
b)
i.
What needs to be placed in A before the mixture from Step 1 is poured through it?
ii.
What is the solid removed in Step 2?
c) List the names of two processes used in this separation.
Topic 1 Practice Questions QP
41
Grade 09 CHM 41
21. Consider the following separation technique to answer questions a
c.
a) Name the method of separation represented by the figure above.
b) Identify the change of state that happens at A and D.
At A:
_____________________________
At D:
_____________________________
H:
_____________________________
C:
_____________________________
c) Label H and C.
Topic 1 Practice Questions QP
42
Grade 09 CHM 41
22. Ahmed wanted to find out if some food colorings contained a banned food dye. He put a drop of
each food coloring and the banned food dye onto some special paper. He hung the paper in a
beaker of water as shown in the figure below.
After 10 minutes, the banned food dye and some of the dyes from the food colorings had moved up
he a e Ah ed e l a e h
bel
Topic 1 Practice Questions QP
43
Grade 09 CHM 41
Answer questions a f.
a) Which method did Ahmed use to separate the dyes? Tick ONE correct box only.
Filtration
Distillation
Evaporation
Chromatography
b) Identify the mobile phase and stationary phase.
Mobile Phase:
_________________________
Stationary Phase:
_________________________
c) Ahmed used ink to draw the baseline. Is this step correct? Justify your answer.
Ba ed
Ah ed
e l
diffe e
d e i
e f he f
d c l i g had
ed
he a e
d) Which food coloring contained the banned dye?
e) Which food coloring contained the most dyes?
f) Which food coloring did not dissolve in water?
Topic 1 Practice Questions QP
44
Grade 09 CHM 41
23. A student wanted to separate a mixture of salt and sand dissolved in water to obtain salt. He used
two different separation techniques (P and Q) that are shown in the diagram below. Answer
questions a c.
a) Name the two separation techniques, P and Q.
P:
____________________________
Q:
_____________________________
b) Write the name of each of the following devices used in separation techniques P and Q.
O:
____________________________
Y:
_____________________________
c) The student added water to the sand and salt then stirred it very well. He decided to begin
with separation technique P then Q in separating the salt solution and sand. Did the student
take the right decision? Justify your answer.
Topic 1 Practice Questions QP
45
Grade 09 CHM 41
24. Ahmed used the apparatus below to distil 100 cm3 of water-soluble ink. Answer questions a c.
a) Which processes occur during distillation? Tick ONE correct box only.
Condensation then evaporation
Evaporation then condensation
Melting then boiling
Melting then evaporation
b) Give the name of the colourless liquid that collects in the test-tube.
c) What would the temperature reading be on the thermometer when the ink has been boiling for
two minutes?
_______°C
Topic 1 Practice Questions QP
46
Grade 09 CHM 41
25. A student wanted to separate a mixture of water, sand and salt. He sketched the diagram below.
Answer questions a and b.
a) Fill in the table below.
Letter
Name of lab equipment
Use
To heat a liquid
W
Filter funnel
P
b) Describe the action the student needs to take if any of the following accidents occur.
Accident
Action taken
The conical flask falls on the floor and breaks
The solution is spilled on the floor
The
de
c
b
k ca che fi e
A drop of the salty water entered the eye
Topic 1 Practice Questions QP
47
Grade 09 CHM 41
26. Identify the separation technique that best fits each of the following statements.
a) Separates liquids with different boiling points
_________________________
b) Separates a liquid and solid by boiling off the liquid
_________________________
c) Separates liquids of different colors
_________________________
d) Separates a solid that can dissolve in water from one
that cannot
_________________________
27. Identify the separation technique from the box below that can be used to separate each of the
following mixtures.
(Each word may be used once, more than once or not at all)
Filtration
Simple Distillation
Fractional Distillation
Decantation
Centrifugation
Evaporation
a) Separating a mixture of soil and water
_______________________________
b) Separating salt from a mixture of salt, sugar and alcohol
_______________________________
c) Separating a mixture of water and ethanol
_______________________________
d) Separating pure water from a solution of sodium chloride
_______________________________
Topic 1 Practice Questions QP
48
Grade 09 CHM 41
28. A student wanted to separate the different components in a liquid mixture. He carried out an
experiment as shown in the diagram below. Answer questions a e.
a) Name the separation technique represented by the diagram above.
b) Which is the most soluble color in the solvent?
c) Identify the stationary phase.
d) Identify the mobile phase.
e) Which color has the smallest Rf value?
Topic 1 Practice Questions QP
49
Grade 09 CHM 41
29. A student wanted to separate a mixture of acetone and water. Use the diagram below to answer
questions a e.
a) Name the separation technique represented by the diagram.
b) If the boiling point of acetone is lower than that of water, which component would be first
collected in container M?
c) The phase change that will take place in part L is _____________.
d) Name the pieces of apparatus listed below.
P:
____________________________
N:
_____________________________
K:
_____________________________
e) If the above apparatus is to be adjusted to separate water from table salt solution, what is
needed to be done?
Topic 1 Practice Questions QP
50
Grade 09 CHM 41
30. A student wanted to separate a mixture of chalk and water. He used the apparatus shown in the
diagram below. Answer questions a d.
a) Identify the filtrate.
b) Identify the residue.
c) Y is called _____________.
d) The mixture of chalk and water is __________________.
Topic 1 Practice Questions QP
51
Grade 09 CHM 41
Grade 09 – CHM 41
Topic 2 – Practice Questions – QP
Subtopic 2.1 – Units of Measurement
1. Which is an S.I unit of time?
5. The average temperature of the human body
is 36℃. This is equivalent to ______ Kelvin.
A.
Minute
B.
Second
A.
273
C.
Hour
B.
298
D.
Day
C.
300
D.
309
2. The SI base unit of mass is __________.
6. The average room temperature is 25 C which
is equivalent to ________ Kelvins.
A.
g
B.
kg
C.
cg
A.
273
D.
mg
B.
298
C.
300
D.
309
3. The prefix pico is _____________ of the SI unit.
A.
10
B.
10
C.
10
D.
10
12
7. What is the temperature of 5 K in Celsius?
3
4. The prefix Mega is __________ times larger than
the unit it precedes.
A.
10
B.
100
C.
1,000
D.
1,000,000
Topic 2 – Practice Questions QP
A.
268℃
B.
273 ℃
C.
268℃
D.
278℃
8. Which of the following units is the smallest?
1
A.
Micrometer
B.
Kilometer
C.
Decimeter
D.
Millimeter
Grade 09 – CHM 41
9. The S.I. unit of mass is ________.
12. The S.I. unit of length is ________.
A.
ounce
A.
meter
B.
pound
B.
decimeter
C.
newton
C.
centimeter
D.
kilogram
D.
millimeter
10. The prefix micro ______ the base unit ______
times.
13. The prefix pico ______ the base unit ______
times.
A.
increases
100
A.
increases
10
B.
increases
1 million
B.
increases
1 trillion
C.
decreases
100
C.
decreases
10
D.
decreases
1 million
D.
decreases
11. Which of the following units is the largest?
A.
Kilogram
B.
Decigram
C.
Centigram
D.
Nanogram
1 trillion
14. Which of the following units is not a SI base
unit?
A.
Celsius
B.
Kilogram
C.
Meter
D.
Mole
15. The prefix deci is __________ times smaller
than the unit it precedes.
Topic 2 – Practice Questions QP
2
A.
10
B.
100
C.
1000
D.
1000000
Grade 09 – CHM 41
16. Write the correct S.I unit for each of the following measurements.
Mass
______________________
Length
______________________
Temperature
______________________
17. A student wrote in his copybook the following paragraph. The class teacher reviewed the work and
told the student that the paragraph has some mistakes. Answer questions a and b.
A conversion factor is a ratio of different measurements. The measurements in the
numerator (on the bottom) is half the measurement in the denominator (on the
top). The numerical value and the unit do not change but the actual size changes.
a) Underline two wrong words and write the correction for each.
b) A student wanted to find the number of seconds in a 50 hour work week. He wrote the answer as
follows: 50 s
. Is the answer of the student correct? If not, write the correct
answer.
Topic 2 – Practice Questions QP
3
Grade 09 – CHM 41
18. A student recorded the temperature of a chemical reaction to be 85.0℃. At the end of the reaction the
temperature dropped to 60.0℃. Convert the temperatures into Kelvin.
(You must show all your work to earn the full mark).
19. Read each of the following statements and identify whether they are True or False. Correct the false
statement.
a) The prefix kilo is larger than milli.
b) A measurement includes a unit only.
c) The S.I unit of time is second.
d) When using a conversion factor, the actual size changes.
Topic 2 – Practice Questions QP
4
Grade 09 – CHM 41
Subtopic 2.2 – Using and Expressing Measurements
5. How many significant figures in 0.004?
1. The radius of a speck is 0.045 mm. The
correct value of this number in scientific
notation is ____________mm.
A.
4.5 × 103
B.
4.5 × 102
C.
4.5 × 10
D.
4.5 × 10
A.
One
B.
Two
C.
Three
D.
Infinite
6. How many significant figures in 10.0?
2. The radius of a speck is 0.67 mm. The correct
value of this number in scientific notation is
____________mm.
A.
One
B.
Two
A.
6.7 × 10
C.
Three
B.
6.7 × 10
D.
Four
C.
6.7 × 101
D.
6.7 × 102
7. How many significant figures in 1080.?
3. How many significant figures in 2371?
A.
1
B.
2
C.
3
D.
4
2.6 × 103
B.
2.6 × 102
C.
2.6 × 10
D.
2.6 × 10
Topic 2 – Practice Questions QP
One
B.
Two
C.
Three
D.
Four
8. The sum of the three numbers 8.32, 12.148
and 0.02 to the correct number of significant
figures is _______________.
4. The radius of a speck is 0.026 mm. The
correct value of this number in scientific
notation is ____________mm.
A.
A.
5
A.
20.488
B.
20.49
C.
20.5
D.
21
Grade 09 – CHM 41
9. The sum of the three numbers 9.765, 12.09
and 0.345 to the correct number of
significant figures is _______________.
A.
22.200
B.
22.20
C.
22.2
D.
22
13. In which of the following numbers is none of
the zero(s) significant?
A.
0.00001
B.
0.010
C.
100.0
D.
1065
14. How many significant figures should be
retained in the following calculation
.
.
?
.
10. The sum of the three numbers 9.1, 14.156
and 0.07 to the correct number of significant
figures is _______________.
A.
23.326
A.
1
B.
23.33
B.
2
C.
23.3
C.
3
D.
23
D.
4
11. The sum of the three numbers 7.412, 11.119
and 0.030 to the correct number of
significant figures is _______________.
15. The result of the operation
.
.
.
reported to the
correct number of significant figures is
__________________.
A.
18.561
B.
18.56
A.
2
C.
18.6
B.
2.5
D.
19
C.
2.46
D.
2.463
12. In which of the following numbers is none of
the zeros significant?
16. Which of the following measurements has
one significant figure?
A.
200.0
B.
1020
A.
0.0004 mL
C.
0.020
B.
4000. mL
D.
0.002
C.
4.000 mL
D.
4.00 mL
Topic 2 – Practice Questions QP
6
Grade 09 – CHM 41
17. How many significant figures should be
retained in the following
.
.
calculation:
? 17.5/2.40
.
A.
1
B.
2
C.
3
D.
4
21. The correct answer for the operation:
456.008 g – 34.008 g is ___________.
1.17
B.
1.176
C.
1.18
D.
1.2
0.0004 mL
B.
4000 mL
C.
4.000 mL
D.
4.44 mL
B.
422
C.
422.000 g
D.
42.2
A.
B.
8.348 m
8.35 m
C.
8.3 m
D.
8.4 m
23. The number of significant figures in the
measurement 103.500 m is __________.
19. Which of the following measurements has
four significant figures?
A.
422.00 g
22. Subtract 8.998 m – 0.65 m
18. The result of the operation:
.
.
.
reported to the
correct number of significant figures is
__________________.
A.
A.
A.
four
B.
three
C.
six
D.
five
24. When 0.90976 cm2 is rounded to three
significant figures the correct answer is _____.
20. Which of the following is the correct scientific
notation for 202000 g?
A.
0.910 cm2
B.
0.91 cm2
A.
2.02000 105 g
C.
0.9098 cm2
B.
2.02 105 g
D.
0.909 cm2
C.
20.2 104 g
D.
2.0200 10-5 g
Topic 2 – Practice Questions QP
7
Grade 09 – CHM 41
25. The number of significant figures in 0.00120
cm is __________.
Use the following information to answer
questions 28 – 30.
The following set of measurements is for
different objects in a chemistry lab.
A.
three
B.
five
11.21 mm
C.
four
2.410 mm
D.
two
6.40 mm
22.2 mm
26. A student measured the boiling point of
water and found it to be 99.20℃. If the
accepted value of the boiling point of water is
100.00℃, then the error is _______.
28. The sum of the above measurements
reported to four significant figures is _______.
A.
42 mm
A.
0.080
B.
42.2 mm
B.
0.80
C.
42.22 mm
C.
8.00
D.
4222 mm
D.
80.0
29. How many of the above measurements
has/have four significant figures?
27. The digit 700 has _________ significant
figure(s).
A.
1 only
A.
1
B.
2 only
B.
2
C.
3 only
C.
7
D.
D.
8
All of the measurements have four
significant figures
30. The result of dividing 22.2 mm by 6.40 mm
has ________ significant figures.
__________________________________________________
A.
1
B.
2
C.
3
D.
4
________________________________________________________
Topic 2 – Practice Questions QP
8
Grade 09 – CHM 41
34. In which of the following numbers is/are the
zero(s) insignificant?
I.
520.
II.
607
III.
18900
IV.
9.000009
Use the following information to answer
questions 31 – 33.
The following set of measurements is for
different objects in a chemistry lab.
12.34 mm
1.530 mm
8.50 mm
11.23 mm
31. The sum of the above measurements
reported to four significant figures is
________.
A.
3.36 mm
B.
33.6 mm
C.
33.60 mm
D.
336.0mm
1 only
B.
2 only
C.
3 only
D.
All of the measurements
have three significant
figures
1
B.
2
C.
3
D.
4
III only
C.
II and III only
D.
III and IV only
A.
8.62
10
7
B.
8.62
10
6
C.
8.62
106
D.
8.62 107
A.
one
B.
two
C.
three
D.
four
37. The correct scientific notation for
0.000000934 is _______.
_____________________________________________________
Topic 2 – Practice Questions QP
B.
36. If a student performed the operation below,
his answer must be reported to _____
significant figures.
.
𝐜
𝐜
. 𝐜
33. The result of dividing 1.530 mm by 8.50 mm
has ________ significant figures.
A.
I only
35. The correct scientific notation for
0.00000862 is _______.
32. How many of the above measurements
has/have three significant figures?
A.
A.
9
A.
9.34
10
7
B.
9.34
10
6
C.
9.34
106
D.
9.34 107
Grade 09 – CHM 41
38. In which of the following numbers is/are the
zero(s) not significant?
I.
0.0032
II.
0.0004
III.
1.470
IV.
2.502
A.
I only
B.
I and II only
C.
III and IV only
D.
I, II and III only
39. If a student performed the operation below,
his answer must be reported to _____
significant figures.
.
𝐜
.𝐜
.
𝐜
42. Which of the following has “ ” as an
uncertain digit?
A.
5.265
B.
3.457
C.
5.249
D.
2.556
43. A student was asked to measure the volume
of a liquid three times. He recorded three
measurements: 68.1 ml, 68.2 mL and 68.0
mL. If the correct measurement was 68.1
mL, the results of the student were _______.
A.
precise only
B.
accurate only
A.
one
C.
accurate and precise
B.
two
D.
inaccurate and imprecise
C.
three
D.
four
40. The ________ describes how close a measured
value is to an accepted value.
44. The mass of a beaker was measured four
times. The masses were 99.997 g, 100.008 g,
100.011 g and 100.005 g. The actual mass is
100.0 g. What can you say about these
measurements?
A.
Accurate and precise
B.
Inaccurate and imprecise
absolute value
C.
Accurate and imprecise
percentage error
D.
Inaccurate and precise
A.
accuracy
B.
precision
C.
D.
41. The ________ describes how close a series of
measurements to one another.
A.
B.
accuracy
precision
C.
absolute value
D.
percentage error
Topic 2 – Practice Questions QP
10
Grade 09 – CHM 41
45. A student was asked to measure the volume
of a liquid three times. He recorded three
measurements: 72.1 ml, 72.2 mL and 72.0
mL. If the correct measurement was 82.2
mL, the results of the student were
_________________.
A.
precise only
B.
accurate only
C.
accurate and precise
D.
inaccurate and imprecise
46. Ali conducts an experiment five times and
gets a solution concentration of 1.9M, 2.1M,
1.8M, 1.9M, and 2.2M. The known
concentration of the solution is 3.0M. Which
of the following are true about Susan's
results?
A.
Precise only
B.
Accurate only
C.
Accurate and precise
D.
Inaccurate and imprecise
47. A student measured the volume of a liquid
three times and found it to be 7.5 mL, 7.4 mL
and 7.6 mL. The actual volume of the sample
is 7.1 mL. These measurements are ________.
A.
precise only
B.
accurate only
C.
accurate and precise
D.
inaccurate and imprecise
Topic 2 – Practice Questions QP
48. Ahmed is conducting an experiment. His first
test gives him a yield of 5.2 grams. His second
test gives him a yield of 1.3 grams. His third
test gives him a yield of 8.5 grams. On
average, his yield is 5.0 grams, which is close
to the known yield of 5.1 grams of substance.
Which of the following are true about his
results?
A.
Precise only
B.
Accurate only
C.
Accurate and precise
D.
Inaccurate and imprecise
49. A 3 groups of students measure the mass of a
product from the same chemical reaction.
The groups recorded data of 8.83 g, 8.84 g
and 8.82 g. The known mass of the product
from that reaction is 8.60g. The group values
are _____.
A.
precise only
B.
accurate only
C.
accurate and precise
D.
inaccurate and imprecise
50. The mass of a beaker was measured and was
found to be 47.47 g. Which of the following
sets of measurement represents the value
with good accuracy and precision?
11
A.
57.47
47.47
37.47
B.
47.46
47.47
47.48
C.
37.47
33.37
57.47
D.
57.46
57.47
57.48
Grade 09 – CHM 41
51. A student measures the mass of different
samples of copper nitrate and finds it to be
3.81 g, 3.82 g, 3.79 g and 3.80 g.The actual
mass of copper nitrate is 3.92 g.The student’s
measurements are _____________ .
A.
accurate and precise
B.
accurate and imprecise
C.
inaccurate and precise
D.
inaccurate and imprecise
52. Four different students measured the mass of
a 1.43 g block four times as shown in the
table below.
Trial
1
Trial
2
Trial
3
53. The length of a metal piece was measured to
be 12.6 cm. Which of the following sets of
measurement represents the values with
good accuracy and precision?
1.43 g 1.44 g 1.42 g 1.45 g
Student X
1.43 g 1.50 g 1.46 g 1.44 g
Student Y
1.54 g 1.56 g 1.58 g 1.50 g
Student Z
0.86 g 1.24 g 1.52 g 1.42 g
The results indicate that the data collected by
student ____ has the greatest accuracy and
precision.
13.2
13.4
13.3
B.
13.2
11.5
12.1
C.
12.5
12.6
12.7
D.
12.1
11.9
12.9
54. The volume of a liquid was measured and it
was found to be 15.5 mL. Which of the
following sets of measurement represents
the values with good accuracy and precision?
Trial
4
Student W
A.
A.
16.2
16.3
16.8
16.9
B.
12.3
12.1
12.4
12.2
C.
15.2
15.3
15.4
15.6
D.
17.1
17.3
17.4
17.6
55. Four students measured the mass of a sample
of zinc sulfate several times and found it to be
4.81 g, 4.82 g, 4.79 g and 4.80 g.The actual
mass of zinc sulfate was 4.81 g.The student’s
measurements were _____________.
A.
W
A.
accurate and precise
B.
X
B.
accurate and imprecise
C.
Y
C.
inaccurate and precise
D.
Z
D.
inaccurate and imprecise
Topic 2 – Practice Questions QP
12
Grade 09 – CHM 41
68. A technician experimentally determined the
boiling point of octane to be 124.1 ℃. The
actual boiling point of octane is 125.7 ℃. The
error is ______.
A.
1.6 ℃
B.
1.3 ℃
C.
1.3 ℃
D.
1.6 ℃
69. A student measures the depth of a swimming
pool to be 4.04 m at its deepest end. The
accepted value is .00 m. The student’s
percent error is _______.
A.
0.04 %
B.
0.1 %
C.
1%
D.
4%
72. A technician experimentally determined the
mass of a beaker to be 120.5 g. The actual
mass of the beaker is 117.9 g. The error is
______ g.
A.
2.6
B.
2.00
C.
2.90
D.
29.0
2.3
D.
2.6
B.
Systematic error
C.
Random error
D.
Gross error
74. Which of the following graphs represent(s) a
direct relationship?
I.
II.
71. The accepted value of a length measurement
is 200 cm, and the experimental value is 198
cm. The percentage error of this
measurement is ________.
A.
2%
B.
C.
73. Which of the following errors is caused by
poor calibration of instruments?
A.
Multidirectional error
70. A chemist measured the amount of caffeine in
a new energy drink and found it to be 87.10
mg. If the accepted amount of caffeine was
84.20 mg, then the error is _______.
A.
0.29
B.
2.3
III.
1%
C.
1%
D.
2%
Topic 2 – Practice Questions QP
15
A.
I only
B.
II only
C.
III only
D.
I and III only
Grade 09 – CHM 41
79. Indicate the number of significant figures in each of the following measurements.
a) 32.25
______________
b) 0.00005
______________
c) 1000
______________
d) 98007
______________
e) 605041
______________
f) 12 students
______________
g) 2000
______________
h) 9.00
______________
i) 200090.
______________
j) 246.22
______________
k) 1.0006
______________
l) 50000
______________
m) 320024
______________
n) 123 m
______________
o) 40,506 mm
______________
p) 9.8000 x 104 m
______________
q) 22 meter sticks
______________
r) 0.070 80 m
______________
s) 98,000 m
______________
t) 345.21
______________
u) 0.000341
______________
v) 1400
______________
Topic 2 – Practice Questions QP
18
Grade 09 – CHM 41
80. Perform the following operations. Make sure that your answers have the correct number of
significant figures and unit.
a) 3.20 cm × 150. cm
b) (2.0 × 10
c) (1.20
4
m) × (1.00
107 m)
d) 148.576 g
10 2 m)
(1.20
10 2 m)
35.41 g
e) 13.00 m – 0.54 m
f) (1.0 10
5
m) × (3.00
10 4 m)
g) 36.47 cm + 2.721 cm + 15.1 cm
h) (1.20
i) 8.0
j) 3.633
107 m)
(1.20
10 2 m)
4.0 10
10
10
k) 22.34 km
2.1
10
1.3 km
Topic 2 – Practice Questions QP
19
Grade 09 – CHM 41
l) 1.2 m
3.11 m
81. Use your knowledge about scientific measurement and units of measurement to answer questions
a – e.
a) Rank the following units in an increasing order of their length.
nanometer, millimeter, decimeter and picometer
b) Write a conversion factor that can be used to convert 3 days to minutes.
c) A substance has a temperature of 20 ℃. This temperature is equivalent to _________K.
d) The SI unit of mass is ____________.
e) The prefix centi is 100 times ___________ than the unit it precedes.
82. Three students carried out several weightings of a copper cylinder, each using a different balance.
Describe the accuracy and precision of each student’s measurements if the correct mass of the
cylinder is 47.32 g.
Weighing 1
Weighing 2
Weighing 3
Weighing 4
Mass of Cylinder (g)
Student 1
Student 2
47.13
47.45
47.94
47.39
46.83
47.42
47.47
47.41
Student 1:
______________________________
Student 2:
______________________________
Student 3:
______________________________
Topic 2 – Practice Questions QP
20
Student 3
47.95
47.91
47.89
47.93
Grade 09 – CHM 41
83. Read the following passage then answer questions a – e.
In the past, people used some human body parts as units of measurement for length such as arms,
fingers and legs. Nowadays, an international system of units, SI units, is widely used to express
mea remen of leng h ma
empera re ime e c Prefi e are added o SI base units to indicate
larger or smaller quantities like mega, kilo and deci.
a) Consider the following units: micrometer, meter, kilometer and centimeter.
o The largest unit is ________________________.
o The smallest unit is ________________________.
b) The prefix nano changes the SI base unit by a factor of ____________.
c) Identify the SI base unit for each of the following quantities.
o Temperature
________________
o Amount of substance
________________
d) A solution has a temperature of 333 Kelvin. This temperature is equivalent to _________℃.
e) Write a conversion factor that can be used to convert 10 years to hours.
Topic 2 – Practice Questions QP
21
Grade 09 – CHM 41
84. Four students measured the mass of a 5.43 g block of metal three times. The results were recorded
in the table below. Answer questions a - e.
Trial 1
Trial 2
Trial 3
Student W
5.43 g
5.44 g
5.42 g
Student X
5.43 g
5.40 g
6.43 g
Student Y
5.54 g
5.56 g
6.41 g
Student Z
6.86 g
6.86 g
6.87 g
a) Which student had the greatest precision but worst accuracy?
b) Which student had the greatest precision and greatest accuracy?
c) Which student had systematic error in all his results?
d) Which student had the highest precision?
e) Which student had the greatest accuracy?
Topic 2 – Practice Questions QP
22
Grade 09 – CHM 41
85. Two students (X and Y) measured the diameter of a gold coin four times. The results were
recorded in the table below. The actual diameter of the coin is 28.0 mm. Answer questions a – c.
Student
Trial 1
Trial 2
Trial 3
Trial 4
Student X
28.1 mm
28.0 mm
28.0 mm
27.9 mm
Student Y
27.3 mm
27.3 mm
27.4 mm
27.4 mm
a) Which student (X or Y) had measurements that are precise but not accurate?
b) Which student (X or Y) had measurements precise and accurate?
c) Which student (X or Y) had measurements with greater accuracy?
d) For student Y, calculate the percentage error in trial 1.
Topic 2 – Practice Questions QP
23
Grade 09 – CHM 41
d) Which of the following graphs (W, X, Y or Z) can be used to represent the data collected in
this experiment? Circle the correct graph.
89. A weather forecast report predicted 20.0 mm of rain in one of the northern emirates. The actual
amount of rain was 25.0 mm. What is the percent error of the weather forecast report?
90. A scientist reported the age of an ice layer at 85 m as 525 years. The accepted value is 500 years.
What is the percent error of the scientist’s value?
Topic 2 – Practice Questions QP
26
Grade 09 – CHM 41
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