GCSE Questions: Kinetic Theory - Gases

Q5. A teacher demonstrated the relationship between the pressure in a gas and the volume of the gas. The diagram shows the equipment used.

(a) What is the range of the syringe?

0 - 25 cm³

[1 mark]

(b) Boyle's Law says that the relationship between the pressure and volume of a gas is given by the equation:

pressure × volume = constant

But for this to be true two factors must remain constant - name those two factors.

The mass of gas and the temperature.

[2 marks]

The initial pressure of the gas in the syringe was 101 000 Pa.

Calculate the constant in the equation:

pressure × volume = constant

constant = 101 000 x 12

= 1,212,000 Pa cm³

[3 marks]

(d) The teacher pulled the plunger slowly outwards and the gas expanded.

The new volume of the gas was 24 cm³.

Calculate the new pressure of the gas.

pressure = constant/volume

pressure = 1,121,000/24

pressure = 50,500 Pa

[3 marks]

(e)Tick the change occurs when the plunger is pulled slowly outwards.

The gas particles stop moving
There are more frequent collisions between the gas particles.
There is more space between the gas particles.

[1 mark]

[10 Marks TOTAL]