Grade 10

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Grade 10 Objective 4
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1 The same amount of hydrogen gas
is in both containers. The pressure in Container
B is A the pressure in Container A
B the pressure in Container A C 2
times the pressure in Container A D 4 times
the pressure in Container A
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2 What is the density at 20C of 12.0
milliliters of a liquid that has a mass of 4.05
grams? A 0.338 g/mL B 2.96 g/mL C
16.1 g/mL D 48.6 g/mL
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3 What is the mass of a 500.00 mL sample
of seawater with a density of 1.025 g/mL? F
487.8 g G 500.0 g H 512.5 g J 625.0
g
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4 Which of the following objects will float
on water? A C B D
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5 Students in a chemistry lab measure the time
it takes four different 100 mL solutions to
pass through a hole in the bottom of a cup.
Which of the following properties of the
solutions is most likely being measured? F
Buoyancy G Mass H Viscosity J Volume
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6 A sample of water from a stream has a greater
density than a sample of distilled water. Which
is the best explanation for the difference in
density? A Streams have kinetic energy. B
Distilled water has a neutral pH. C Streams
can contain dissolved salts. D Distilled water
can contain dissolved gases.
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7 The experiment illustrates that iron
and sulfur combine to form A a nonmetal B
a compound C a mixture D an alloy
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8 The picture shows a model of the
element A fluorine B helium C
beryllium D oxygen
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9 Oxygen (O2) is an example of A
an alloy B a molecule C a salt D a
mixture
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10 An unknown silvery powder has a
constant melting point and does not chemically
or physically separate into other substances.
The unknown substance can be classified as A
an element B a compound C a mixture D
an alloy
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11 Which of these are composed of two or more
different substances that are chemically
combined in a definite ratio? F Compounds G
Mixtures H Elements J Solutions
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12 Which of these represents a physical
change? A Iron rusting B Ice melting C
Wood burning D Food spoiling
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13 Texas horned lizards must eat a large
number of harvester ants each day. The formic
acid in the harvester ants helps neutralize a
base that the lizard produces. The products from
this reaction would be A an acid and a
base B a salt and water C an acid and
water D a salt and a base
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14 In the rock cycle, which of these is a
chemical change involved with the formation of
igneous rocks? F Compression of sediments G
Heat loss from lava H Subduction of
plates J Formation of minerals
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15 Which of the following is an example of
a chemical change? F Ice cracking G
Sugar dissolving H Milk souring J Lead
melting
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16 Which of these describes a
pollution-producing process that involves only a
physical change? A Coal with a high sulfur
content is burned, producing gases that
cause acid rain. B Chlorofluorocarbons are
released, changing ozone in the upper
atmosphere into oxygen. C Hot wastewater is
discharged into a lake, lowering oxygen
levels in the water. D Nitrogen oxide
emissions combine with water vapor,
producing nitric acid.
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17 Rust (Fe2O3) forms on an iron (Fe) pipe
after prolonged exposure to humid air. What
type of change does this illustrate? F
Mechanical G Nuclear H Chemical J
Physical
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18 Sheets of ice containing mostly pure water
can be formed by decreasing the temperature of
saltwater. Which of these best describes this
change? F Chemical change G Physical
change H Nuclear change J Atomic change
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19 The reaction equation below shows the
process of oxidizing iron. Balance the equation
by calculating the coefficients. A 2, 3,
1 B 1, 1, 1 C 4, 3, 2 D 4, 2, 2
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20 To produce 4 molecules of sugar, a
plant needs F 6 molecules of hydrogen G
12 molecules of ATP H 18 molecules of
water J 24 molecules of carbon dioxide
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21 What are the coefficients that will
balance this chemical equation? A 2, 1,
1 B 3, 4, 2 C 2, 2, 1 D 4, 3, 2
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22 The illustrations show a
conservation-of-mass experiment. The solution
in the beaker lost mass because F
materials have less mass at high
temperatures G the mass of the reactants and
products was less than 100 g H sodium
sulfate (Na2SO4) is lighter than air J
some of the water molecules turned into
gas
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23 What coefficient values will
balance the reaction shown above? A 2, 2,
1 B 1, 1, 1 C 2, 1, 2 D 1, 2, 2
Carbon monoxide (CO) burns readily in oxygen
(O2), forming carbon dioxide (CO2) __CO(g)
__O2(g) __CO2(g)
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24 In the procedure shown
above, a calcium chloride solution is mixed with
a sodium sulfate solution to create the
products shown. Which of the following is
illustrated by this activity? F The law of
conservation of mass G The theory of thermal
equilibrium H The law of conservation of
momentum J The theory of covalent bonding
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25 One reason water is an effective
solvent is that it A contains an oxygen
atom B is a polar molecule C has a
freezing point of 0C D can evaporate easily
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26 What characteristic of water remains
the same no matter what is dissolved in it? A
The ratio of hydrogen to oxygen B The
ability to refract light C The hydroxide ion
concentration D The freezing temperature
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27 Which factor makes water an effective
solvent? F The presence of molecular
oxygen G Its lack of covalent bonds H The
polar nature of its molecules J Its abundance
on Earths surface
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28 Which of these is a reason that frogs
and fish are sensitive to changes in water
temperature? A Cold water has a higher
concentration of dissolved oxygen than
warm water. B Warm water has a higher range
of compressibility than cold water. C
Cold water has a greater density than warm
water. D Warm water has a higher viscosity
than cold water.
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Solubility Rules 29 Which of the
following salts has the greatest solubility in
water at 25C? F CaCO3 G FeS H
HgCl2 J KClO4
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30 As a scuba diver goes deeper
underwater, the diver must be aware that the
increased pressure affects the human body by
increasing the A bodys temperature B
amount of dissolved gases in the body C
amount of suspended solids in the body D
concentration of minerals in the body
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31 A recipe calls for 210 grams of sugar to be
dissolved in 0.25 liter of water. After the
mixture is stirred, some sugar crystals remain in
the water. What can be added to the mixture to
help dissolve the remaining sugar
crystals? A Thermal energy B 2.0 g of
baking soda C Ice cubes D 2.0 g of sodium
chloride
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Grade 10 Objective 4 Answer Key
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