(The content below are notes for students to use to revise the topic. The notes will include a condensed overview of the topic, including all relevant IGCSE questions and answers given in point form) 1.1 Solids, Liquids and Gases Q. Describe the structure of solids, liquids and gases in terms of particle separation, arrangement and movement Solids: regular arrangement, movement limited to simple vibrations. Particles are always touching each other and cannot be further compressed Liquids: random arrangement. Molecules take up the space of the container, and slide over each other. Particles are somewhat touching each other Gases: random arrangement. Particles are the furthest apart. Movement is random and in all directions This is a heating curve The substance above is a pure substance. How do we know? Because the curve shows sharply defined gradients with no smooth curves 2. Explain, in terms of kinetic particle theory, w...