The three states of matter can be represented by the particle model. This model explains the properties of substances in their different states, as well as changes of state.

See what happens to the particles in materials when they melt, evaporate and boil with this interactive activity for the GCSE Edexcel combined science specification.

There are different ways to separate mixtures, for example by filtration, crystallisation, distillation or chromatography. The method chosen depends upon the type of mixture.

Understanding how to approach exam questions helps to boost exam performance. Question types will include multiple choice, structured, mathematical and practical questions.