Photosynthesis is an example of

A

an exothermic reaction.

B

an endothermic reaction.

C

a reaction that gives off heat.

D

a reaction that emits energy.

2

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Which term describes an enzyme?

A

substrate

B

reactant

C

catalyst

D

product

3

How does a catalyst work?

A

by increasing the temperature of a chemical reaction

B

by decreasing the pressure of a chemical reaction

C

by increasing the concentration of reactants in a reaction

D

by decreasing the activation energy of a reaction

4

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?

A

First, he should measure the final temperature of the liquid when X and Y react without substance A. Then, he should measure the final temperature when he adds substance A to X and Y. He will find out if substance A is a catalyst.

B

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.

C

First, he should measure the final temperature of the liquid when X and Y react without substance A. Then, he should measure the final temperature when he adds substance A to X and Y. He will find out if substance A is an enzyme.

D

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 an enzyme.

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