Pretest

Question 1

Which statement best describes the amount of catalyst that remains at the end of a reaction?

Revolt · Accepted Answer

The amount of catalyst is the same at the end as at the beginning of the reaction.

Question 2

What must happen before a chemical reaction can begin?

Revolt · Accepted Answer

The activation energy must be reached.

Question 3

Which statement best describes how a catalyst can speed up a chemical reaction?

Revolt · Accepted Answer

The catalyst decreases the activation energy needed.

Question 4

Lactase and carbonic anhydrase are examples of what type of substance?

Revolt · Accepted Answer

enzyme

Question 5

Which is the best definition of activation energy?

Revolt · Accepted Answer

the energy required to form or break the bonds of reactant molecules

Question 6

How does a catalyst work?

Revolt · Accepted Answer

by decreasing the activation energy of a reaction

Question 7

Photosynthesis is an example of

Revolt · Accepted Answer

an endothermic reaction.

Question 8

Which term describes an enzyme?

Revolt · Accepted Answer

catalyst

Question 9

If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction?

Revolt · Accepted Answer

The rate would increase.

Question 10

Which statement correctly describes a chemical reaction?

Revolt · Accepted Answer

Bonds between atoms break and reform.

Pretest Answers