A portable camping heater uses liquefied propane from a small canister.
Propane boils at a temperature of −42∘C-42^\circ\text{C}−42∘C to form propane gas. Convert this temperature to the Kelvin scale.
State one way in which the molecules in propane gas are different from the molecules in liquid propane.
Explain how the molecules of propane gas exert a pressure on the inside walls of the canister.
When the valve is opened, a volume of 450 cm3450\text{ cm}^3450 cm3 of gas at a pressure of 240 kPa240\text{ kPa}240 kPa escapes from the canister. As the gas escapes, its pressure decreases to the atmospheric pressure of 100 kPa100\text{ kPa}100 kPa.
Calculate the volume of the escaped gas at a pressure of 100 kPa100\text{ kPa}100 kPa, assuming the temperature remains constant.
Once the valve is closed, the gas remaining inside the canister cools down, so its temperature decreases. Explain what happens to the pressure of the gas in the canister.
51 exam-style questions on Edexcel IGCSE Physics Ideal gas molecules. Each one has a worked solution and a mark scheme showing where the marks go.