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Question

Use the kinetic molecular theory in order to briefly explain the following statements:

a) The pressure that is exerted by a gas decreases with a decrease in temperature. (2 marks)

b) Gases are easily compressed. (2 marks)

Answer 1

(a)  When the temperature goes down, the molecules zip around more slowly, so they don't hit the walls of the containers so often or with so much force.

(b)  There's lots of space between the molecules.  Make the container smaller (pressure higher) just means the flying molecules will hit the walls more frequently and forcefully, but the molecules will still make little contact with each other.