Chemistry I Semester Exam 2008
* Place all answers on the exam.
DO NOT WRITE ON THIS EXAM
1. You are given 100 grams of a 75% sugar
solution by mass. This solution contains
A) 100 grams of sugar and 75 grams of
water
B) 75 grams of sugar and 25 grams of
water
C) 75 grams of sugar and 75 grams of
water
D) 25 grams of sugar and 75 grams of
water
2. The shape of the water molecule is best
described as
A) bent or v-shaped
B) pyramidal
C) linear
D) crystal lattice
7.
Which statement about water is false?
A) Water molecules strongly attract
each other.
B) The oxygen end of water has a
negative charge.
C) Water has low surface tension.
D) Water is a bent molecule.
8.
The results for a chloride ion test on
A sample of Ohio River water is
(no color or precipitate). This means
that
A) not enough reference solution was used
B) no ion is present or a very small
amount of the ion may be present
C) the ion is definitely present
D) the water is pure
6. An electric company removes water from
a river in order to use it in its electric
power plant. The water leaving the power
plant would be
A) warmer and have a lower oxygen
concentration
B) cooler and have a higher oxygen
concentration
C) warmer and have a higher oxygen
concentration
D) cooler and have a lower oxygen
concentration
3. The most common solvent on Earth is
A) carbon tetrachloride
B) alcohol
C) benzene
D) water
4. Which term describes the carbon dioxide
that is dissolved in a carbonated
beverage?
A) solute
B) solution
C) solvent
D) precipitate
7. A molecule that has bonds with unequal
sharing of electrons is a
A) metallic molecule
B) polar molecule
C) nonpolar molecule
D) nuclear molecule
5. Generally, for solids dissolving in liquids,
how does an increase in temperature
affect the solubility of a solid?
A) does not affect solubility
B) decreases solubility
C) increases solubility
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8. A person's home has lead-containing
solder in the joints in the copper water
pipes. In which case is the person likely
to be exposed to the most lead ion in the
drinking water?
A) Cold basic water is sent through the
pipes.
B) Hot acidic water is sent through the
pipes.
C) Hot basic water is sent through the
pipes.
D) Cold acidic water is sent through the
pipes.
9. To calculate percent concentration of a
solution, divide the mass of the
A) solute by the mass of the solvent
B) solute by the mass of the solution
C) solvent by the mass of the solution
D) solvent by the mass of the solute
Use the following to answer questions 12-14:
10. What type of chemical bond is found in
substances where a positive particle is
attracted to a negative particle?
A) ionic bond
B) hydrogen bond
C) nonpolar covalent bond
D) polar covalent bonds
11. For gases dissolving in liquids, how does
an increase in temperature affect the
solubility of a gas?
A) increases solubility
B) does not affect solubility
C) decreases solubility
12. Which substance
solubility at 0°C?
A) NaCl
B) KNO3
C) KCl
Page 2
has
the
lowest
3. Which of the following is a correct
atom inventory for Silver Nitrate.
(you must write the correct formula)
13. What is the mass of KCl needed to make
a saturated solution in 100 grams of
water at 50°C?
A) 50 g
B) 42 g
C) 82 g
D) 33 g
A) one silver, one nitrogen
B) one silver, one nitrogen, one
oxygen
C) one silver, one nitrogen, two
oxygens
D) one silver, one nitrogen, three
oxygens
1. When an atom of sodium loses an
electron, it becomes a
A) positive ion
B) negative ion
C) positron
D) neutron
4. Which particle diagram best represents a mixture of
one element and one compound?
A)
B)
2. Which pair forms a homogeneous
mixture?
A) sand and water
B) sugar and water
C) oil and water
D) oil and vinegar
C)
5. Suspensions, colloids, and solutions are types of
A) elements
B) compounds
C) mixtures
D) substances
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12. A graduated cylinder was placed on a balance and th
mass recorded. Alcohol was placed in the the cylind
6. What two measurements of a substance make up theand the new mass recorded. The picture below show
substance's density value?
the volume of the liquid in the cylinder. Calculate th
A) mass and weight
liquids density.
B) volume and pressure
C) mass and volume
Mass of graduated cylinder = 12.45g
D) temperature and mass
Mass of g.c. and alcohol = 35.76g
Mass of alcohol = __________
9. A student claims that she has a
bottle of completely "Pure" water. If
that is the case, then
A) the water may have dissolved ions
and will have the tyndall effect.
B) the water may have dissolved
ions but will not have the tyndall
effect.
C) the water will not have anything
dissolved in it and will not have
the tyndall effect.
10. Which substance is an example of a
compound?
A) NO(g)
B) Ni(s)
C) Na(s)
D) Ne(g)
11. Ice is less dense than water.
A) Ice will sink in water
B) Ice will float in water
A)
B)
C)
D)
23.31 g/mL
.728 g/mL
1.37 g/mL
8.69 g/mL
13. Which of the following is the most accurate
interpretation for the chemical equation:
2H2 + O2  2H2O
A) Two hydrogens react with two
oxygens to make water
B) Two hydrogen molecules react with
two oxygen molecules to produce
two water molecules
C) Two hydrogen atoms react with on
oxygen atom to form two water
molecules.
D) Two hydrogen molecules react with
one oxygen molecule to produce
two water molecules.
14. Which common material is a solution?
A) pure water
B) a bottled lemon-lime drink
C) italian salad dressing
D) fresh bacon fat
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15. The label on a solid tomato fertilizer
says “ammonium phosphate,
ammonium sulfate, muriate of potash,
sulfate of potash, sulfate of
potash-magnesia, manganese oxide,
iron oxide.” The fertilizer is a
A) solution
B) compound
C) mixture
D) pure substance
16. What causes a bottle of soda to burst
when placed in a freezer overnight?
A) The water in the soda contracts
when it freezes.
B) The water in the soda expands
when it freezes.
C) The bottle contracts when it
freezes.
D) The bottle expands when it
freezes.
17. Which process is the best way to
remove the color and odor from water?
A) Filter the water sample through
sand and gravel.
B) Add charcoal and filter the water
Sample using a funnel and filter
paper.
C) Distill the water sample using a
condenser and flask.
D) Add a test solution to the water
such as Na2CO3
Page 4
18. Which comparison is correct
concerning the percent of water used
across the United States?
A) The east uses a greater percentage
For irrigation than the midwest
B) More water is used for electric than
for agriculture in the whole
United States (Nation)
C) The South, East and the Midwest all
use more water for Steam/electric
than any other purpose.
D) Alaska and Hawaii both use no
water for mining
Purposes.
19.
21. Which symbol does not represent an ion?
A) Na
B) Ca+
C) Cl–
D) H+
In the above picture our dog "Lucky"
is getting a bath. Which of the
following statements is true regarding
how water is used in the picture
A) It is an indirect use, but something
we could do without given a
water shortage.
B) It is an indirect use of water, but a
necessary use of daily water.
C) It is a direct use of water and not
necessary in a water shortage
situation
D) It is a direct use of water and
should be done everyday
regardless of the water supply on
hand
20. The mayor must decide the amount of
water to have sent to Riverwood
during the three day water shortage.
Which of the following factors should
not be included?
A) The number of lawns needing
water
B) The population of the town
C) The amount of drinking water
needed each day per person
D) The amount of water needed for
personal hygiene for the 3 days
(washing face, teeth, etc.)
Page 5
22. Which statement correctly describes the type and
number of atoms represented by the formula
Ca(OH)2?
A) 1 calcium, 1 oxygen, 2 hydrogen
B) 1 calcium, 2 oxygens, 2 hydrogens
C) 2 calciums, 2 oxygens, 2 hydrogens
D) 1 calcium 1 oxygen, 1 hydrogen
23. Why is distillation not used to purify
most tap water?
A) Distillation is too expensive.
B) Distillation does not remove all
impurities.
C) Distillation eventually alters the
molecular structure of the water.
D) Distillation gives off radioactive
waste products.
24. Which plan would be the most
effective way for a family to conserve
water?
A) Everyone should reduce shower
time in half.
B) Family members should drink
soda instead of water.
C) Family members should eat fruits
to lessen the need of water.
D) Water the house plants half as
much.
25. When an atom transfers an electron to
another atom,
A) the atom that loses the electron
becomes neutral
B) the atom that gains the electron
becomes a positive ion
C) the atom that loses the electron
becomes a positive ion
D) the two atoms repel each other
26. When numerical data is gathered from
a lab activity, analysis of the data can
help lead to conclusions from
the activity. The average of all the data
is also known as the
A) mean
B) mode
C) median
27. HHS chemistry students were asked to
explain why raisins "dance" when placed
in sprite. Which of the following is the
most correct explanation
for why raisins "rise" to the top and then
"sink" to the bottom.
A) "The carbonation of the sprite moves
the raisins up with the carbination.
When the raisins get close to surface,
oxygen gets in the cracks making it
go back down."
B) "The raisins or the bubbles have a
neg. or pos. charge. the opposite
charges attract and link on to each
other. There are so many bubbles on
the raisins that slowly begin to rise
making the raisins less dense
than the sprite."
C) "Because the liquid is carbonated the
gas in the liquid will cling to the
raisins and when enough cling it
causes the raisin to float until it
reaches the surface then it sinks back
down."
D) "The carbon, fizz and bubbles push
the raisins up and then the raisins
drop because they have no force
pushing them."
28. Which two terms for types of matter
both identify substances?
A) elements and compounds
B) compounds and solutions
C) mixtures and compounds
D) nonmetals and mixtures
Page 6
29. When particles with the same charge
move closer to each other, the particles
will
A) attract
B) repel
C) bond
D) combine
___ 4. Which person developed the
periodic table based on the
properties of the elements?
___ 1. Pennies made after the year 1982
have the highest content of which
element?
___ 5. What is the total number of molecules in
one mole of nitrogen, N2?
A)
B)
C)
D)
E)
A)
B)
C)
D)
zinc
copper
lead
aluminum
iron
___ 2. By using results from tests like the
“Metal Reactivities” lab, the metal
elements can be ranked in order of
their chemical reactivity. This
ranking is called the
A)
B)
C)
D)
data table
periodic table
density series
activity series
John Dalton
Dimitri Mendeleev
Fritz Haber
Niels Bohr
6.02  1023
1.50  1022
1.20  1024
3.01  1023
___ 6. The chemical formula for baking soda is
NaHCO3. The subscript “3” in this formula
means three
A)
B)
C)
D)
molecules of baking soda
atoms of oxygen
atoms of carbon
molecules of carbon dioxide
___ 7. Mendeleev's table of the elements was
organized by
___ 3. Which equation correctly
represents the oxidation of calcium
to calcium ion?
A)
B)
C)
D)
A)
B)
C)
D)
Ca2+ + 2e– → Ca
2Ca2+ + 2e– → Ca4+
Ca → 2Ca+ + 2e–
Ca → Ca2+ + 2e–
A) relative atomic masses
B) each element's capacity to combine
with carbon
C) atomic numbers
D) the elements' phases—solid, liquid, or
gas
___ 8. Which of these is a physical change?
A)
B)
C)
D)
Page 7
evaporation
oxidation
combustion
substitution
___ 13. The modern periodic law classifies
elements according to:
___ 9. Which symbol represents a
metalloid?
A)
B)
C)
D)
E)
A)
B)
C)
D)
Si
Br
Na
Al
Kr
___ 14. Given the ionic equation:
___ 10. Which part of our planet is the
major “supply house” of the raw
materials for manufactured goods?
A)
B)
C)
D)
hydrosphere
thermosphere
lithosphere
atmosphere
Mg + Cu2+  Cu + Mg2+
Which particle is reduced?
A)
B)
C)
D)
___ 11. Given the unbalanced equation:
__ Al4C3 + __ H2O  __ CH4 + __ Al(OH)3
Which list gives the correct
coefficients to balance the equation?
A)
B)
C)
D)
boiling points
melting points
atomic masses
atomic numbers
1, 12, 3, 4
3, 12, 1, 4
2, 6, 3, 4
12, 1, 4, 3
Cu2+ ion
Cu atom
Mg2+ ion
Mg atom
___ 15. Which symbol represents a nonmetal?
A)
B)
C)
D)
E)
Fe
W
Br
K
Hg
___ 16. How many atoms of oxygen are shown in
the formula Al2(SO4)3?
___ 12. Calculate the molar mass of the
compound Ca3(PO4)2. Show your
work.
A)
B)
C)
D)
1
12
7
4
___ 17. Which of these zinc compounds has the
highest percent by mass of zinc?
A) ZnCO3
B) ZnCl2
C) ZnSO4
Page 8
___ 18. Which property is characteristic of aUse the following to answer question 23:
nonmetal?
Use the following equation to respond to
A) high density
the question(s) below:
B) good conductor of heat
C) brittle
5Na2C2O4 + 2KMnO4 + 8H2SO4  K2SO4 + 2MnSO4 +
D) malleable
5Na2SO4 + 10CO2 + 8H2O
___ 19. Chemical equations are balanced
with numbers called
A)
B)
C)
D)
symbols
coefficients
subscripts
exponents
A)
B)
C)
D)
E)
___ 20. Which choice is a renewable
resource?
A)
B)
C)
D)
metals
wood
coal
oil
A) nuclear properties
B) physical properties
C) chemical properties
the electrons
the products
an equation
the reactants
___ 22. Which two quantities contain the
same number of atoms?
A)
B)
C)
D)
60
56
12
20
15
___ 24. Properties such as melting point, density,
and electrical conductivity are examples of
___ 21. Substances that exist before a
chemical reaction takes place are
called
A)
B)
C)
D)
___ 23. The atom count for oxygen on the
reactant side is
2 mole NaCl and 1 mole CaCl2
1 mole NO2 and 1 mole of H2O
2 mole NH3 and 2 moles of HI
1 mole Zn and 2 moles of H2
Page 9
___ 25. Which of these is an example of an alloy?
A)
B)
C)
D)
nylon
wood
glass
brass
___ 26. How many moles of sulfur are present in a
16-g sample of sulfur?
A)
B)
C)
D)
0.50 mol
2.0 mol
32 mol
0.25 mol
___ 27. When an ion of copper in the ore
___ 31. Given the balanced equation for the
2+
chalcocite gains electrons, the Cu ion is
reaction producing ammonia:
A)
B)
C)
D)
N2 + 3H2  2NH3
fused
reduced
ionized
oxidized
How many moles of N2 are needed to
Produce 6 moles of NH3?
A) 2
B) 3
C) 6
D) 9
___ 28. A metal is usually obtained from its
ore by a process called
A)
B)
C)
D)
casting
oxidation
reduction
melting
___ 32. How many moles of hydrogen
atoms are in 4 moles of H2O?
A)
B)
C)
D)
___ 29. Which of these elements is most
similar chemically to phosphorus?
A)
B)
C)
D)
N
Si
S
C
___ 33.
Which metal will reduce copper
ions to copper metal from an
aqueous copper nitrate solution?
___ 30. Horizontal rows of elements in the
periodic table are called
A)
B)
C)
D)
periods
octaves
triads
families
12
4
8
2
A)
B)
C)
D)
silver
zinc
copper
gold
___ 34. In the periodic table, the most active
metals are found
A)
B)
C)
D)
Page 10
directly to the left of the steplike line
at the far left side
directly to the right of the steplike line
at the far right side
___ 35. In chemical reactions, “matter is neither
___ 39. Using redox reactions that occur in
destroyed or made” is a statement of the
aqueous solutions in order to refine
metal ions to metal atoms is called
A) law of mass action
B) law of conservation of energy
A) pyrometallurgy
C) law of action and reaction
B) isometallurgy
D) law of conservation of matter
C) electrometallurgy
E) law of molar masses
D) hydrometallurgy
___ 36. On the periodic table, the halogens are___ 40. The boiling point of HCl is –85°C
found in
while the boiling point of HI is –36°C.
Estimate the boiling point of HBr,
in °C.
A) period 3
B) period 4
C) group 17
A) –41°C
D) group 13
B) –61°C
C) –74°C
D) –56°C
E) –51°C
___ 37. The mass number of an atom of an
isotope is equal to the sum of the
A)
B)
C)
D)
___ 41.
protons and electrons
neutrons, electrons, and protons
protons and neutrons
neutrons, electrons, and positrons
___ 38. Which of these observations is
evidence of a chemical change?
A) Rubbing alcohol evaporates
from a surface.
B) A pop can is crushed by a
hammer.
C) Bubbles of a gas explode when
ignited.
D) A drink mix dissolves in water.
Page 11
What is the total number of
neutrons in an atom with a mass
number of 27 and an atomic
number of 13?
A)
B)
C)
D)
14
40
13
27
___ 42. Vertical columns of elements in the
periodic table are called:
A)
B)
C)
D)
triads
octaves
groups
periods
___ 43. If a resource is renewable it means that
___ 49. Given the unbalanced equation:
the resource can be
___ Al + ___ H2SO4  ___ H2 + ___ Al2(SO4)3
A) replaced by nature in a short period of
time
B) decomposed by nature over a long
period of time
C) reused without any changes
D) recycled into a new product
Use the following to answer questions
44-47:
A)
B)
C)
D)
4, 2, 3, 1
2, 3, 3, 1
4, 3, 1, 3
1, 3, 3, 2
___ 50. Which particles are lost by an atom
of zinc when it is oxidized?
Identify the given resource as
A) renewable
B) nonrenewable
C) not a resource
A) protons
B) electrons
C) neutrons
___ 44. Atmospheric oxygen
Short Answer: Write in Complete
sentences
What are the physical and chemical
properties of metals that make them a
good choice for coins? (give at least 3)
___ 45. Zinc
___ 46. Drinking water
___ 47. Gasoline
___ 48. The type of discarded waste that
makes up the greatest amount of
space in landfills is
A)
B)
C)
D)
Which list gives the correct
coefficients to balance the equation?
glass
paper
plastic
metal
Page 12
31. Ninety-seven percent of the Earth's
supply of water is in the oceans.
Which of these is the second largest
supply of the Earth's water?
A) clouds
B) groundwater
C) lakes and rivers
D) icecaps and glaciers
Activity Series of Metals
[most active]
Li
Rb
K
Cs
Ba
Sr
Ca
Na
Mg
Al
Ti
Mn
Zn
Cr
Fe
Co
Ni
Sn
Pb
*H2*
Cu
Ag
Au
32. Compared to the density of water at
4°C, the density of water at 80°C is
A) less
B) greater
C) the same
D) gone
[least active based on the hydrogen standard]
30. The best source of water for a home
in a rural location that is far from lakes
or rivers is
A) the ocean
B) groundwater
C) ice caps
D) clouds
Page 13
33. Which phrase best describes diatomic
molecules?
A) molecules with one atom only
B) molecules with one atom and one
ion
C) molecules with two atoms of the
same element
D) molecules with two different
element's atoms
34. Which ion is shown with its correct charge?
A) Ca2+
B) KC) Nº
D) He3+
35. Which formula is correct for the ionic
compound formed from combining
magnesium ions and chloride ions?
A) MgCl
B) MgCl2
C) Mg2Cl
D) Mg2Cl2
36. How many protons are in the nucleus
of an atom of sodium?
A) 11
B) 12
C) 23
D) 32
37. What is the sequence of numbered
processes used to purify water
according to the procedure in the
“Foul Water” laboratory activity?
1. charcoal adsorption
2. gravel/sand/gravel filtration
3. distillation
4. oil-water separation
A) 1, 2, 3, 4
B) 4, 2, 1, 3
C) 2, 4, 1, 3
D) 3, 1, 4, 2
38. Which two of the three basic subatomic
particles are found in the atom's nucleus?
A) electrons and neutrons
B) neutrons and protons
C) protons and electrons
Page 14
39. The “shorthand” used to represent an
element with one or two letters is
called
A) an equation
B) a formula
C) a symbol
D) an edition
40. A student is given a 50.0-mL sample
of water to purify in the Foul Water
lab activity. After the purification
process, the purified water measured
13.0 milliliters. Determine the
percent water lost during this
procedure.
A) 11.8%
B) 26.0%
C) 74.0%
D) 92.4%
15. Heavy metal ions bind to ___________
and affect the _____, _____, _____
systems.
A) carbohydrates;
reproductive,
nervous, and muscle
B) DNA; reproductive, liver, and
kidney
C) proteins; respiratory, digestive, and
reproductive
D) proteins; kidney, liver, and nervous
16. A pond is contaminated with a chemical
that is a base. Which ion will be present
in higher concentration than in
uncontaminated water?
A) SO42–
B) Ba2+
C) H+
D) OH–
Use the graph in #19 for #17.
14. At what temperature will 130 g of KNO3
dissolve in 100 grams of water to
produce a saturated solution?
A) 27°C
B) 72°C
C) 90°C
D) 68°C
17. If 8 milligrams of oxygen is dissolved in
1000 grams of water at 12°C, the
solution is
A) Unsaturated
B) Supersaturated
C) Saturated
Page 15
18. Vinegar contains a water solution of
acetic acid. The most likely pH of
vinegar is
A) 7
B) 3
C) 13
D) –1
19.
Water at 30°C is saturated with oxygen.
The temperature of the water is cooled to
5°C. How much more oxygen must be
dissolved in 1000 grams of water to keep
it saturated?
A) 20 mg
B) 12 mg
C) 6 mg
D) 1 mg
20. Water dissolves ionic compounds very
well. Which statement best describes
how this happens?
A) The (-) oxygen end of water is
attracted to the cation while the (+)
hydrogen end is attracted to the
anion.
B) Nonpolar bonds are made between
water and ionic compounds.
C) The nonpolar ends of water attract
the polar ionic compounds.
D) Ionic compounds break water
molecules into hydrogen and
hydroxide.
21. A solution that contains more solute than
the indicated on the solubility graph for a
certain temperature is
A) diluted
B) saturated
C) unsaturated
D) supersaturated
22. Which list of steps is in the correct order
for municipal water treatment?
A) screening,
prechlorination,
flocculation,
settling,
filtration,
postchlorination, fluoridation, and
discharge
B) screening and sand removal, primary
settling, aeration, secondary settling,
chlorination, and discharge
C) primary settling, screening and sand
removal,
secondary
settling,
aeration, chlorination, and discharge
D) primary settling, aeration, screening
and sand removal, secondary
settling, chlorination, and discharge
Page 16
23. Hard water is caused by all of the
following ions except
A) magnesium
B) iron
C) sodium
D) calcium
24. Some municipalities add a soluble
fluoride compound to their drinkingwater supply to
A) reduce tooth decay by strengthening
tooth enamel
B) reduce the need to brush teeth to
remove bacteria
C) eliminate iron ions from the water
D) eliminate the bacteria found in water
25. The purpose of adding chlorine to water
during water treatment is to
A) soften the water
B) kill bacteria
C) reduce the pH
D) remove hardwater ions
26. The water treatment process that
removes objects larger than soda pop
cans is called
A) flocculation
B) screening
C) settling
D) chlorination
27. Water can be purified through different
natural processes. Which process does
not help purify water?
A) bacterial action
B) filtration
C) photosynthesis
D) evaporation
28. Ninety-seven percent of the Earth's
supply of water is in the oceans. Which
of these is the second largest supply of
the Earth's water?
A) groundwater
B) icecaps and glaciers
C) clouds
D) lakes and rivers
29. Starting with what happens to water on
the surface of a lake, which list is the
correct order of steps in the hydrologic
cycle?
A) precipitation,
condensation,
evaporation
B) condensation,
evaporation,
precipitation
C) evaporation,
condensation,
precipitation
D) evaporation,
precipitation,
condensation
30. Which type of water use is drinking a
sports drink?
A) indirect use
B) direct use
31. What causes a bottle of soda to burst
when placed in a freezer overnight?
A) The bottle contracts when it freezes.
B) The water in the soda contracts when
it freezes.
C) The bottle expands when it freezes.
D) The water in the soda expands when
it freezes.
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32. A particle made from two or more
nonmetals bonded together is called
A) a mixture
B) a molecule
C) a compound
D) an element
33. If an atom loses an electron, it becomes a
A) positron
B) neutron
C) negative ion
D) positive ion
34. A solution is one type of
A) suspension
B) mixture
C) compound
D) element
37. The label on a solid tomato fertilizer
says “ammonium phosphate, ammonium
sulfate, muriate of potash, sulfate of
potash, sulfate of potash-magnesia,
manganese oxide, iron oxide.” The
fertilizer is a
A) pure substance
B) mixture
C) solution
D) compound
38. Which of these is an element?
A) nitrogen
B) water
C) ammonia
D) air
39. The smallest unit of an element is
A) a molecule
B) a proton
C) an atom
D) an electron
35. The ion-exchange resin in a water
softener will
A) put air into the water
B) remove chlorine from the water
C) kill bacteria in the water
D) replace magnesium with sodium ions
36. When a result in an ion test is negative
(no color or precipitate) for a water
sample, this means that
A) the test produced a solution but not a
colloid
B) the test results produced a
suspension
C) no ion is present or a very small
amount of the ion may be present
D) not enough reference solution was
used
40. In testing water for ions, a reference
solution is used to
A) show what happens when the ion is
not present in the test
B) check to see if the control has ions in
it
C) show what happens when the ion is
present in the test
D) make sure the unknown sample
contains the ion that is being tested
41. Substances in a chemical reaction that
exist before the reaction takes place are
called the
A) products
B) protons
C) electrons
D) reactants
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42. Which of the following is not an
essential metal?
A) iron
B) potassium
C) calcium
D) mercury
43. Lead was used in all of the following
escept
A) gas pipes
B) gasoline
C) street lamps and light bulbs
D) paints
44. Bubble gum dissolves very well in
lighter fluid but it does not dissolve in
water. Bubble gum is most likely
A) a heavy metal
B) nonpolar molecular
C) ionic
D) polar molecular
47. Two students, Jim and Zach, test the
solubility of potassium chloride in
100mL of water at three different
temperatures by adding the solute little
by little and stirring. A point was
reached at each temperature where no
more solute was able to dissolve. The
amount of solute was recorded. Which
of the following statements is not
accurate.
A) Data collected for this experiment
would be grams of solute that
dissolved in 100mL of water
B) The amount of water and stirring
should be controlled during the
experiment
C) The experiment is more valid when
it is completed several times and an
average amount is calculated at each
temperature.
D) The variable for this experiment was
the amount of water
45. When the flow of a river is fast, the
dissolved oxygen levels can become
elevated for several days. The problem
for fish then may be:
A) flocculation
B) gas bubble trauma
C) suffocation
D) problems with fish egg development
48. Which of the following is the correct
formula for aluminum hydroxide?
A) AlH2O
B) Al(OH)3
C) AlOH
D) AlH
46. 17g of sucrose is dissolved in 183g of
water. What is the percent concentration
of sucrose?
A) 9.3%
B) 17%
C) 10.7%
D) 8.5%
49. According to the EPA, the acceptable pH
range for drinking water is:
A) 6.5-9
B) 6.5-8.5
C) 6-8.5
D) 5-9
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50. Which of the following is the correct
name for the following ionic compound
Ba(NO3)2
A) barium nitrite
B) barium nitrate
C) barium nitrogen oxide
D) barium nitroxide
Answer Key
Bonus (5pts.) Explain the “Chemistry” in the
Cartoon. Write your answer on this test.
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1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
C
A
D
A
C
A
B
B
A
A
C
B
B
D
D
D
A
B
C
A
D
E
C
A
B
B
C
B
C
A
D
B
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
D
B
D
C
B
A
C
C
D
D
C
B
B
D
C
B
B
B
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