Edexcel International GCSE Physics5d Ideal gas molecules Checklist

Papers 1 and 2

• I can explain how the molecules in a gas have random motion, and that they exert a force, and so a pressure, on the walls of a container.
• I understand why there is an absolute zero of temperature, which is –273 °C.
• I can describe the Kelvin scale of temperature and convert between the Kelvin and Celsius scales.
• I understand why a rise in temperature leads to a rise in the average speed of gas molecules.
• I know that the Kelvin temperature of a gas is proportional to the average kinetic energy of its molecules.
• I can explain, for a fixed amount of gas, the qualitative relationship between:•pressure and volume at constant temperature•pressure and Kelvin temperature at constant volume
• I can use the relationship between the pressure and Kelvin temperature of a fixed mass of gas at constant volume: p₁ / T₁ = p₂ / T₂
• I can use the relationship between the pressure and volume of a fixed mass of gas at constant temperature: p₁V₁ = p₂V₂