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Chapter 14
Chemical Reactions
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Chapter 14
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1. The diagram shows how a light stick works. Light sticks
begin to glow when the vial inside the stick is broken. Chemicals
inside the vial mix with chemicals outside of the vial. Which of
the following statements best supports the idea that a chemical
reaction is occurring?
A The vial is broken into smaller
pieces.
B Energy is released in the form of
light.
C Two different substances are
combined.
D The substances are in a flexible
container.
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Chapter 14
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1. The diagram shows how a light stick works. Light sticks
begin to glow when the vial inside the stick is broken. Chemicals
inside the vial mix with chemicals outside of the vial. Which of
the following statements best supports the idea that a chemical
reaction is occurring?
A The vial is broken into smaller
pieces.
B Energy is released in the form of
light.
C Two different substances are
combined.
D The substances are in a flexible
container.
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Chapter 14
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2. A scientist at the Chemical Analysis Core Facility at
the University of Georgia’s Athens campus carries out a
reaction in a test tube. After the bubbling stops, she
notices that the test tube is very warm. What might she
conclude about the reaction?
A The reaction happened very quickly.
B The reaction is endothermic.
C The reaction is exothermic.
D No reaction took place.
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Chapter 14
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2. A scientist at the Chemical Analysis Core Facility at
the University of Georgia’s Athens campus carries out a
reaction in a test tube. After the bubbling stops, she
notices that the test tube is very warm. What might she
conclude about the reaction?
A The reaction happened very quickly.
B The reaction is endothermic.
C The reaction is exothermic.
D No reaction took place.
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Chapter 14
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3. Which of the following contains one oxygen atom?
A H2O
B CO2
C 2N2O
D Co
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Chapter 14
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3. Which of the following contains one oxygen atom?
A H2O
B CO2
C 2N2O
D Co
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4. Some silverware is made with the element silver
(Ag). Over time, this silverware will turn black if it is not
cleaned with a special solution. Which of the following
statements best explains why the element silver in the
silverware turns black?
A It absorbs energy when exposed to warm food.
B It breaks down into smaller and smaller particles.
C It reacts with substances in the air to form a new
substance.
D It changes from one state of matter into another state
of matter.
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Chapter 14
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4. Some silverware is made with the element silver
(Ag). Over time, this silverware will turn black if it is not
cleaned with a special solution. Which of the following
statements best explains why the element silver in the
silverware turns black?
A It absorbs energy when exposed to warm food.
B It breaks down into smaller and smaller particles.
C It reacts with substances in the air to form a new
substance.
D It changes from one state of matter into another state
of matter.
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Chapter 14
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5. Which chemical equation correctly shows the
formation of water from hydrogen and oxygen?
A H2 + O2 → H2O
B 2H2 + O2 → 2H2O
C H2 + 2O → H2O
D H + O2 → H2O
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Chapter 14
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5. Which chemical equation correctly shows the
formation of water from hydrogen and oxygen?
A H2 + O2 → H2O
B 2H2 + O2 → 2H2O
C H2 + 2O → H2O
D H + O2 → H2O
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Chapter 14
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6. The energy diagram shows the progress of a
chemical reaction. Which of the following statements
about this reaction is true?
A Energy is absorbed during
this reaction.
B The rate of this reaction
increases, then it
decreases.
C The reaction is exothermic.
D Activation energy is not
required in this reaction.
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Chapter 14
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6. The energy diagram shows the progress of a
chemical reaction. Which of the following statements
about this reaction is true?
A Energy is absorbed during
this reaction.
B The rate of this reaction
increases, then it
decreases.
C The reaction is exothermic.
D Activation energy is not
required in this reaction.
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7. Which of the following is an example of a chemical
change?
A water freezing into ice
B ice melting into water
C meat spoiling and changing color
D butter softening into a liquid
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Chapter 14
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7. Which of the following is an example of a chemical
change?
A water freezing into ice
B ice melting into water
C meat spoiling and changing color
D butter softening into a liquid
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8. Which of the following is true of the law of conservation of
energy?
A The law of conservation of energy states that energy
cannot change forms.
B The law of conservation of energy states that energy
cannot be created or destroyed.
C The law of conservation of energy states that the total
energy of the reactants is greater than the total energy of the
products.
D The law of conservation of energy states that the total
energy of the reactants is less than the total energy of the
products.
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8. Which of the following is true of the law of conservation of
energy?
A The law of conservation of energy states that energy
cannot change forms.
B The law of conservation of energy states that energy
cannot be created or destroyed.
C The law of conservation of energy states that the total
energy of the reactants is greater than the total energy of the
products.
D The law of conservation of energy states that the total
energy of the reactants is less than the total energy of the
products.
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9. Look at the equations. Which of the following
statements is true?
A Equation 1 is an endothermic reaction.
B Both equations 1 and 2 are endothermic reactions.
C Equation 2 is an endothermic reaction.
D Both equations 1 and 2 are exothermic reactions.
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9. Look at the equations. Which of the following
statements is true?
A Equation 1 is an endothermic reaction.
B Both equations 1 and 2 are endothermic reactions.
C Equation 2 is an endothermic reaction.
D Both equations 1 and 2 are exothermic reactions.
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10. What are three ways by which the rate of a
chemical reaction can be increased?
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10. Answer - Full-credit answers should include three
of the following points. The rate of a chemical
reaction can be increased by:
• increasing the temperature
• increasing the surface area of the reactants
• increasing the concentration of the reactants
• adding a catalyst
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11. Compare synthesis and decomposition reactions
and give an example of each.
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11. Answer - Full-credit answers should include the
following points:
• In a synthesis reaction, two or more substances
combine to form a new compound.
• In a decomposition reaction, a compound breaks down
into two or more simpler substances.
• Examples may vary. An example of a synthesis
reaction is the reaction of sodium with chlorine to
produce sodium chloride. An example of a
decomposition reaction is carbonic acid breaking down
into water and carbon dioxide.
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