Question

the particle diagrams represent a balloon before and after a change. the particles are represented by dots and the speed of them are represented with dotted lines. according to the particle diagrams, which of the following likely happened?

a temperature increased and volume increased.
b temperature decreased and volume decreased.
c temperature decreased and volume increased.
d temperature increased and volume decreased.

Explanation:

Step1: Analyze the volume change

The balloon on the right (after change) is smaller than the one on the left (before change). So, the volume has decreased.

Step2: Analyze the temperature change

The speed of the particles (represented by dotted lines) in the after - change diagram is less than in the before - change diagram. Since the speed of gas particles is related to temperature (higher speed means higher temperature), the temperature has decreased.

Answer:

B. Temperature decreased and volume decreased.