By the end of this unit you should be able to
Define matter as being everything that has mass and takes up space
State that all matter is made of particles and that physical properties of matter can be explained using the 'particle model'
Compare solids, liquids and gases in terms of their physical properties and relate these to the particle model
Recognise changes of state when they occur and use the appropriate word to describe a particular change range: evaporation, condensation, freezing, melting, sublimation, desublimation
Use the particle model to explain why changes of state release heat energy or require heat energy to be supplied; predict heat changes for a given situation
Explain the difference between evaporation and boiling; explain why boiling point depends on air pressure
Use the particle model to illustrate different types of substance range: pure substance, mixture, element, compound, solid, liquid, gas
Identify a solution as being a mixture of solid and liquid in which the solid has broken down into its individual particles and spread out in the liquid
Define the term diffusion and explain how and why it occurs
Identify the solvent and solute in a solution; apply appropriate terms for these mixtures range: dissolving, saturated, unsaturated, sediment, suspension, solubility, soluble, insoluble
Explore ways that mixtures can be separated and explain these in terms of the particle model range: filtering, decanting, evaporation, distillation, chromatography