Catalysts

Question 1

Which statement correctly describes a chemical reaction?

Revolt · Accepted Answer

Bonds between atoms break and reform.

Question 2

How does a catalyst work?

Revolt · Accepted Answer

by decreasing the activation energy of a reaction

Question 3

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

Revolt · Accepted Answer

enzyme

Question 4

What is a substrate?

Revolt · Accepted Answer

a reactant that is catalyzed by an enzyme

Question 5

The lock-and-key mechanism refers to

Revolt · Accepted Answer

the complementary shapes of an enzyme and a substrate.

Question 6

Photosynthesis is an example of

Revolt · Accepted Answer

an endothermic reaction.

Question 7

A substance that influences the reaction but does not participate in the reaction is a

Revolt · Accepted Answer

catalyst

Question 8

A researcher is designing a laboratory experiment to determine whether the inorganic substance A affects the rate of a reaction between two colored liquids, X and Y. When the reaction is complete, the liquid is clear. The reaction between X and Y is similar to one used by manufacturers to produce certain chemicals in factories.Which method would best answer his question about reaction rate and what will he find out about substance A?

Revolt · Accepted Answer

First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst.

Question 9

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

Revolt · Accepted Answer

The catalyst decreases the activation energy needed.

Question 10

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.

Catalysts Answers

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