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3. Particle model of matter

Density and changes of state

3 lessons
3.1 Density Density as mass per unit volume, the equation density = mass / volume, its units, and how the arrangement of particles explains the densities of solids, liquids and gases. AQA Edexcel OCR 3.2 Required practical: density Required practical: measure the density of a regular solid, an irregular solid and a liquid using a ruler, a eureka can, a measuring cylinder and a balance. AQA Edexcel OCR 3.3 Changes of state and internal energy Changes of state as physical changes in which mass is conserved, and internal energy as the total kinetic and potential energy of the particles in a system. AQA Edexcel OCR

Heating and temperature

3 lessons
3.4 Specific heat capacity Specific heat capacity, the equation change in thermal energy = mass x specific heat capacity x temperature change, and why water takes so much energy to heat. AQA Edexcel OCR 3.5 Required practical: specific heat capacity Required practical: find the specific heat capacity of a metal block using an immersion heater, a joulemeter or meters, and a thermometer, and reduce heat loss with insulation. AQA Edexcel OCR 3.6 Specific latent heat Specific latent heat of fusion and of vaporisation, the equation E = mL, and why the temperature stays constant during a change of state. AQA Edexcel OCR

Gases

2 lessons
3.7 Particle motion and gas pressure The random motion of gas particles, how collisions with the walls cause pressure, how temperature affects pressure at constant volume, and the kelvin scale and absolute zero. AQA Edexcel OCR 3.8 Gas pressure, volume and doing work on a gas Gas pressure acting at right angles to surfaces, the relationship pV = constant at constant temperature, and how doing work on a gas raises its temperature. For Separate Science. Separate only AQA Edexcel OCR