AnswersAA-F26 Physical ScienceBalancing Chemical Equations

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Activation energy is required to

A
make particles move faster and increase the temperature of a substance.
B
increase the number of particle collisions to transfer more energy.
C
break chemical bonds and start a chemical reaction.
3

This is anreaction.

A
endothermic
B
exothermic
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Use the graph to complete the sentences.

Answers:
A chemical substance that increases the reaction rate and lowers the activation energy needed to start a reaction is called a(n).:catalyst
A chemical substance that that can slow the rate, or stop a chemical reaction entirely, is called a(n).:inhibitor
A catalyst isin a chemical reaction.:not changed
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catalyst✔ inhibitor

A
catalyst
B
✔ inhibitor
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The large bump in the middle represents the.

A
energy level of reactants
B
activation energy
C
energy level of products
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If the solid figure was cut along the dotted line, which statements would be true? Check all that apply.

A
Nothing would change.
B
The surface area would increase.
C
The volume would remain constant.
D
The surface area would decrease.
E
The volume would increase.
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Which part of the graph does a catalyst change?

A
reactants energy
B
activation energy
C
products energy
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How would this graph change if a catalyst were used?

A
The bump would be higher.
B
The bump would be lower.
C
The flat lines would be higher.
D
The flat lines would be lower.

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