Study Guide:
8th Grade DIAS
Question 1: When a new substance is
created it is caused by what kind of
reaction?
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Question 2: When an item goes from being
a solid to a gas, like the dry ice we observed
in class what happens to the atoms inside
the substance?
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Question 3: What happens to the particles
in a substance when the substance does the
following things:
Melt: __________________________
Freeze: ___________________________
Boil: _______________________________
Question 4: Draw what the particles in a
liquid look like when kinetic energy is
introduced and a substance goes from being
liquid to gas.
Question 6: I have a rectangular prism made
up of 30 identical smaller blocks. Which of
the following best compares one of the
small blocks with the whole rectangular
prism?
A. The small block has the same mass as
the whole cube.
B. The small block has the same weight as
the whole cube.
C. The density of the small block is the
same as the density of the whole cube.
D. The volume of the small block is the
same as the volume of the whole cube.
Question 7: The elements iron (Fe), copper
(Cu), and mercury (Hg) are classified as
metals. Which physical property of metals
do they all share?
A. They are all magnetic
B. They are all a shiny, reddish color.
C. They all have the same melting points.
D. They all have thermal and electrical
conductivity.
Question #8 If a substance has a particular
boiling point, for example, if rubbing water
boils when it reaches a temperature of 100
degrees Celsius does it matter how much
water you are trying to boil? If you were
given a swimming pool full of water and
were somehow able to heat the whole pool
to 100 degrees would it still boil? Explain
your answer.
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Question 5:
Find the Mass of an item that has a Density
of 6.0g/ml and a volume of 2ml.Assume the
item is regularly shaped and is a cube.
Density= Mass divided by Volume
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Question 9: Mrs. Coll’s class was
completing a magnetism lab in class. Mrs.
Coll dropped a magnet on the floor, and it
broke into several pieces. Which of the
following best identifies the properties of
the smaller pieces?
A. The smaller pieces will have different
boiling points.
B. All of the pieces will be magnetic.
C. All of the pieces will be soluble in water.
D. Some pieces will have different
densities.
Question 10- In a chemical reaction two
substances come together to form
something different, the really cool thing
is, even though a new substance is
formed the _________ does not
change.
QUESTION 11- You combine Vinegar
and Baking Soda and create Carbon
Dioxide Gas.
Which of the following best describes
the result of this chemical change?
F The volume of the vinegar and the
volume of the baking soda are constant
during the chemical change.
G The volume of the Vinegar increases
as the chemical change produces more
gas.
H The mass of the vinegar and baking
soda is equal to the mass of the gas.
J The mass of the vinegar and baking
soda is greater than the mass of the
Carbon Dioxide.
Question 12- Water can occur as liquid
water, water vapor, or ice. The water
molecules move at different speeds when
they are in each state. Which of the
following best describes the relative speeds
at which the molecules move in each state?
A. water vapor - slowest, liquid water intermediate, ice - fastest
B. liquid water - slowest, ice intermediate, water vapor - fastest
C. ice - slowest, liquid water intermediate, water vapor - fastest
D. ice - slowest, water vapor intermediate, liquid water - fastest
13. Stephanie is given an unknown liquid to test in
the laboratory. She thinks this liquid might be
alcohol. Which physical property would be the most
helpful for Stephanie to determine the identity of the
liquid?
A.
Its color
B. Its mass
C.
Its boiling point
D. Its volume
14. My mom’s wedding ring was made up of mostly
a gold and silver mixture. My ring is made up of pure
gold; however the diameter and volume have
remained the same. Which of the following also
changed?
A. Density
B. Electrical conductivity
C.
Magnetism
D. Thickness
15. Xavier is doing a Science Fair experiment on the
boiling points of ocean water. He asked his mom to
bring him 300 ml of ocean water, but she only
brought him 100 ml. If the original boiling point of
300 ml of ocean water is 105 °C, at what temperature
will 100 ml of ocean water boil?
A. 150 °C
B. 105 °C
C. 100 °C
D. 112
°C
16. Mrs. Coll’s class conducted an experiment to test
physical properties of different substances. One of
the students constructed the following data table in
their notebook:
Group 1 Samples
Group 2 Samples
Paperclips
Plastic
Penny
Paper
Aluminum Foil
Wood
Which physical property did the student most likely
use to sort the samples into two groups?
A. Magnetism B. Melting point
C. Solubility in
water D. Electrical conductivity
17. Sarah is completing a lab in which she is required
to identify an unknown substance. She records
several observations and measurements of the
substance.
Which of the following properties will be most
helpful to Sarah in making a correct identification?
A. Density
B. Mass C. Volume
D. Weight
18. Density is defined by as the amount of matter
contained in a specific volume, and is expressed as
the equation below.
𝑫𝒆𝒏𝒔𝒊𝒕𝒚 = 𝑴𝒂𝒔𝒔
𝑽𝒐𝒍𝒖𝒎𝒆
If a solid metal cube has a density of 5.0 g/cm3 and a
mass of 10.0 grams, what is its volume?
A. 0.5 cm³
B. 2.0 cm³
C. 9.0 cm³
D. 18.0 cm³
19. Ryan boiled a liter of water and then stirred sugar
into it, adding more sugar until no more would
dissolve in the water, creating a saturated solution. Is
Ryan’s Solution an example of a physical or
chemical change? Why?
A. Physical-because something new has been formed.
B. Chemical- because something new has been
formed.
C. Physical-because only the appearance has
changed.
D. Chemical – because the appearance has changed.
20. Charlotte poured some baking soda into a model
volcano filled with vinegar. It frothed and bubbled
and fizzed, but when it finally stopped, the liquid in
the model looked just like vinegar. What is the best
question for her to ask in order to determine if a
chemical change occurred?
A. Did a gas form?
B. Did a solid disappear?
C. Did different molecules form?
D. Did any of the atoms disappear?
21. Andy stirred 100 grams of salt (sodium chloride,
NaCl) into a pot of water until he could no longer see
any grains of salt. If he allows all the liquid to
evaporate, how much salt will he find in the pot?
A. 0 grams
B. 50 grams
C. 100 grams
D. 200 grams
22. George painted a picture on a canvas, and he
mixed some colors together because he wanted to
make a particular shade of blue. Mixing paint is an
example of what kind of process?
A. chemical change
B. physical
change
C. forming a compound
substance into another
D. dissolving one
23. Combining 1/2 cup of vinegar with 1 gallon of
milk causes the vinegar, which is an acid, to react
with the milk. The milk sours and thickens, creating
cottage cheese. What kind of change is this?
A. chemical
B. mechanical C. physical
D.
potential