Question

The diagram below shows how a chemical reaction in a cylinder with a piston that affects the volume of the system. Use this diagram to answer the following questions.

Piston Keaction System

Which of the following statements best describes the reaction?

Part 1 (1 Point)

Choose one:

A.   Work is done by the system on its surroundings.

B.   Work is done on the system by the surroundings.

C.   No work is being done.

D.   A conclusion cannot be determined from the information given.

Part 2   (2 points)

If the reaction is endothermic, what happens to the internal energy of the system when the reaction is proceeding?

Choose one:

A.   It increases.

B.   It decreases.

C.   It remains constant.

D.   A conclusion cannot be determined from the information given.

 

Answer 1

1)

here: Vf < Vi

since W = -P*(Vf-Vi)

since Vf

Answer: B

2)

Q = positive (since reaction is endothermic)

delta E = Q + W

Since both Q and W are positive, delta E will be positive

This implies internal energy increases

Answer: A