GCSE Questions: Kinetic Theory - Gases

Q4.

(a) The above photo shows balloons filled with helium gas.

Tick two of the statements below that correctly describe the movement of the gas particles in a helium filled balloon.

The particles all move in a predictable way.
The particles move at the same speed.
The particles move in circular paths.
The particles move in random directions.
The particles move with a range of speeds.
The particles vibrate about fixed positions.

[2 marks]

(b) The pressure of a helium in the balloon is 100,000 Pa.

The volume of the balloon is 0.030 m³ .

The balloon is compressed at a constant temperature causing the volume to decrease to 0.025 m³ .

No helium leaves the balloon.

Calculate the new pressure in the balloon.

[4 marks]

The mass and volume of helium in the balloon remained constant.

Explain why the pressure exerted by the helium inside the balloon would increase.

[4 marks]

[10 Marks TOTAL]