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Four canisters contain helium gas.

Question illustration
A
W
B
X
C
Y
D
Z
2
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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
3

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
4

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.
5

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
6

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
7

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.
8

Which describes a scenario that would most likely use an inhibitor?

A
During activity, sugar is converted to energy.
B
When at rest, the body stores sugar.
C
After a meal, protein digestion occurs in the stomach.
D
Before a meal, digestive juices are preparing for food.
9

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
10

The chart shows the path reactants take to become products.

Question illustration
A
Heat was removed from the activation energy to create the product.
B
Heat was added to create the product.
C
The products have less energy than the reactants.
D
The products have the same energy as the reactants.

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