Prior knowledge, recapped

What you need to know before the reactions: properties of substances, states of matter, the particle model, symbols and formulas.

Properties of substances – a short recap (recap) Colour, smell, hardness, density: this is how you recognise a substance. This is how you describe it.
States of matter – a short recap (recap) Solid, liquid, gaseous: this is how you tell whether only the state changes in a process.
Particle model – a short recap (recap) Substances consist of tiny particles. You need this to understand what happens to the atoms in a reaction.
Symbols and formulas – a short recap (recap) Every element has a symbol, every compound a formula. This is how you read them before you write reaction equations.