Unit 3: Solids, liquids and gases

Matter and particles, how solids, liquids and gases behave, and melting, freezing and boiling.

• 3.1 Matter – Everything around you is matter – even the air.
• 3.2 Matter is made of particles – Tiny particles explain how solids, liquids and gases behave.
• 3.3 How do solids, liquids and gases behave? – Pour it, squash it, spread it – testing the states.
• 3.4 Melting, freezing and boiling – Heating and cooling change the state of matter.
• 3.5 Melting in different solids – Does chocolate melt before ice? Test it fairly.
• 3.6 Melting and boiling points – Every substance has its own melting and boiling temperatures.
• 3.7 Chemical reactions – Some changes make brand-new substances.