Which of the following will increase when the temperature of a fixed amount of gas at a constant volume is increased?

Question

I. Pressure of the gas

II. Kinetic energy of molecules 

III. Space between molecules 

 

I only 

 

II only 

 

I and III

 

I and II 

 

II and III

 

I think it's I and III 

Answer 1

I suggest always examining the fundamental equation 

 

PV = nRT

 

If V, n, and R are constant while T increases, then P has to increase proportionally to T.  Therefore, I is a good answer.  But you also know that as T rises, the average molecular kinetic energy also rises, so II is also a good answer.  But if the volume is constant, the molecules cannot spread out more, so III is not a good answer.  It looks like only I and II are correct.

Answer 2

I and II