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A level: Kinetic Theory Questions

Q6.

The table gives the average kinetic energy of gas molecules at certain temperatures.

Ek/J × 10–21

 6.21  6.62  7.04   7.45   7.87 

8.28

T/K

 300  320  340  360 380

400

 

(a) On a sheet of A4 graph paper plot a graph of Ek against T.

(i) Use your graph to determine the average kinetic energy of gas molecules at 350 K.

(ii) Determine the gradient of your graph and hence calculate a value for the Boltzmann constant. Show all your working.

(8 marks)

(b) One of the assumptions of the kinetic theory is that collisions of gas molecules are elastic.

(i) State what is meant by an elastic collision.

(ii) State another assumption of the kinetic theory.

(iii) Explain how the data in the table leads to the concept of absolute zero.

(4 marks)

(Total 12 marks)