The diagram above illustrates a syringe with a petri-dish fixed to the top of its plunger.

A known mass, **M**, is placed on the petri-dish. The piston of the syringe moves downward and the volume, **V**, of air beneath the piston is read and recorded.

The procedure is repeated for **four** other values of M.

Fig 2(a) represents the masses, Mi, placed on the petri-dish.

Fig 2 (b) represents the corresponding volumes, V where = 1,2,3,4 and 5.

(i) Read and record the values of M

(ii) Read and record the corresponding values of V

(iii) Evaluate V-1

(iv) Tabulate your readings.

(v) Plot a graph with M on the vertical axis and V-1 on the horizontal axis

(vi) Determine the slope, s, of the graph.

(vii) What physical law does this experiment verify?

(viii) State **two** precautions that are necessary to ensure accurate results when performing

this experiment

(b) (i) Explain the effect of decreasing the volume of a fixed mass of gas at constant

temperature using the kinetic molecular theory of gas.

(ii) A cylinder is filled with a gas at 27oC. If the volume of the gas is increased at

constant pressure to 1.25 times its original value, calculate the final temperature of

the gas.