8.1
Pure substances and mixtures
What 'pure' means to a scientist, and how melting and boiling points show whether something is pure.
8.2
Dissolving and solubility
Solutes, solvents and solutions, and why some things dissolve faster or more than others.
8.3
Filtration and evaporation
Separating an insoluble solid from a liquid, and getting a dissolved solid back out of a solution.
8.4
Distillation and chromatography
Getting a pure liquid back from a solution, and separating the dyes in an ink.
Daily 5
Five quick diagram questions a day from this unit. The ones you get wrong come back sooner. Progress saves in this browser.
What this unit covers
Mapped to the KS3 national curriculum (Chemistry: pure and impure substances; Physics: matter).
| Programme of study | Lesson |
|---|---|
| the concept of a pure substance | 8.1 |
| the identification of pure substances | 8.1, 8.4 |
| mixtures, including dissolving | 8.2 |
| simple techniques for separating mixtures: filtration, evaporation, distillation and chromatography | 8.3, 8.4 |
| conservation of material and of mass, and reversibility, in dissolving | 8.2, 8.3 |
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