Catalysts

Question 1

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

Revolt · Accepted Answer

The catalyst decreases the activation energy needed.

Question 2

Which is the best definition of activation energy?

Revolt · Accepted Answer

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

Question 3

Photosynthesis is an example of

Revolt · Accepted Answer

an endothermic reaction.

Question 4

Which term describes an enzyme?

Revolt · Accepted Answer

catalyst

Question 5

Which statement correctly describes a chemical reaction?

Revolt · Accepted Answer

Bonds between atoms break and reform.

Question 6

Which two substances bind using a lock-and-key mechanism?

Revolt · Accepted Answer

enzyme and substrate

Question 7

The lock-and-key mechanism refers to

Revolt · Accepted Answer

the complementary shapes of an enzyme and a substrate.

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

What must happen before a chemical reaction can begin?

Revolt · Accepted Answer

The activation energy must be reached.

Question 10

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

Revolt · Accepted Answer

enzyme

Catalysts Answers

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