AnswersHS Physical Science A - CR Summer School 2026Rate of Chemical Reactions

Rate of Chemical Reactions Answers

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There are a few ways to increase the rate of a reaction. What is altered when the amount of a substance in a given volume is increased?

A
temperature
B
concentration
C
surface area
D
pressure
2
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Food can spoil very quickly. Which methods are used to minimize the reactions that allow bacteria and fungi to grow?

A
preservatives and low temperature
B
high temperature and preservatives
C
catalysts and high temperatures
D
low temperatures and catalysts
3

Enzymes are added to a chemical reaction to lower the activation energy. What is an enzyme classified as?

A
a catalyst
B
an inhibitor
C
an accelerator
D
a depressant
4

Four canisters contain helium gas.

Question illustration
A
W
B
X
C
Y
D
Z
5

The pictures represent three different states of matter.

Question illustration
A
X → Y → Z
B
Z → Y → X
C
Y → Z → X
D
Y → X → Z
6

Which best describes activation energy?

A
the maximum amount of energy required to end a chemical reaction
B
the amount of energy absorbed in an endothermic reaction
C
the minimum amount of energy required to start a chemical reaction
D
the amount of energy released in an exothermic reaction
7

Three treatments of different starting materials are listed. Which statement explains the treatments?

Question illustration
A
Substance 1 was activated by a decrease in temperature, Substance 2 was activated by the change in concentration, and Substance 3 decreased the surface area.
B
Substance 1 was activated by a decrease in temperature, Substance 2 was activated by the change in pressure, and Substance 3 increased the surface area.
C
Substance 1 was activated by the heat and inactivated by ice, Substance 2 was activated by the change in pressure, and Substance 3 decreased the surface area.
D
Substance 1 was activated by the heat and inactivated by ice, Substance 2 was activated by the change in concentration, and Substance 3 increased the surface area.
8

Three students are working with different substances to measure the chemical changes that occur. Chao is working with milk, Mia is working with carbon dioxide gas, and Ezra is working with rock. Which would best describe the way to treat each substance to get a faster reaction?

A
Chao should change the temperature, Mia should adjust the pressure, and Ezra should increase the surface area.
B
Chao should change the concentration, Mia should adjust the temperature, and Ezra should increase the surface area.
C
Chao should change the temperature, Mia should adjust the concentration, and Ezra should decrease the surface area.
D
Chao should change the concentration, Mia should adjust the pressure, and Ezra should decrease the surface area.
9

Food can spoil very quickly. Which methods are used to minimize the reactions that allow bacteria and fungi to grow?

A
preservatives and low temperature
B
high temperature and preservatives
C
catalysts and high temperatures
D
low temperatures and catalysts
10

Why is reaching activation energy necessary?

A
Reactants require a minimum amount of energy to start to break a chemical bond.
B
Products require a minimum amount of energy to start to break a chemical bond.
C
Reactants must have the maximum amount of energy to start to break a chemical bond.
D
Products must have the maximum amount of energy to start to break a chemical bond.

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