The properties of matter. States, density, surface tension, solubility, particle theory — and how we separate mixtures in science and industry.
Solid, liquid and gas — and where water fits in all three.
Melting, boiling, condensing and the energy behind each change.
Explain the behaviour of matter using tiny moving particles.
Why things float or sink, and what makes water special.
Calculate density and discover the skin on water.
What dissolves in water, and how do we describe it?
Temperature, stirring and particle size — what matters?
Dilute, concentrated, saturated — and the supersaturated surprise.
Atoms, compounds and mixtures — classifying matter.
Use physical properties to pull a mixture apart.
Model water pollution and design a solution to clean it up.