Ideal gas is initially confined to one side of a perfectly insulated rigid chamb

Question

Ideal gas is initially confined to one side of a perfectly insulated rigid chamber by a movable frictionless piston, as shown in the figure. (The other side of the chamber is evacuated.)

What is true of this gas after the piston is suddenly pulled to the right end of the chamber? (There may be more than one correct choice.)

A. The expansion causes the temperature of the gas to decrease.
B. The pressure of the gas decreases.
C. The temperature of the gas does not change.
D. The expansion causes the internal energy of the gas to decrease.

Choose from below:

1. A

2. A, D

3. B, C

4. B, D

Explanation / Answer

The temperature remains constant, because no energy is lost or gained. So...

A is false

B is true (volume increases, pressure decreases)

C is true

D is false

So the correct choice is 3, B and C are true

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