Kinetic Theory of Gases

Question 1

(1) At –273 °C the particles in a gas are

Answer 1

stationary

Question 2

(1) The temperature of a gas changes from 300 K to 150 K.

State how the average kinetic energy of the gas particles changes.

Answer 2

(Average KE/it is ) halved

Question 3

(3) Explain how the helium gas exerts a pressure on the balloon.

Answer 3

particles collide with / hit
/strike / bombard (1)
 the wall / sides of the
balloon (1)

 (causing a) force / (rate
of) change in momentum
(1)

Question 4

(1) Suggest what will happen to the balloon as it carries on rising above 30 000 m.

Answer 4

bursts/explodes or words to that

effect

Question 5

(3) Describe how the average kinetic energy of the particles of the gas changes as
the temperature of the gas changes.

Answer 5

(Average) KE/it increases as the
temperature increases
(1)
Idea of proportionality / KE doubles
when the temperature doubles
(1)
(when)
temperature in Kelvin /K
(1)