Year 7 · Summer First Half
Chemistry
4 lessons from 1 unit.
Unit C3 · lessons 1 to 4 of 7
Almost nothing you meet is one pure substance. This unit is about telling what is in a sample, getting the parts back out again, and the one test that settles whether something is pure when looking at it cannot.
- 01Pure or mixture?ClassifyA carton of juice, a gold ring and a bottle of lab water all claim to be pure. Only one of them is — so what is the chemist actually asking?Open this lesson
- 02Dissolving and solutionsModelSugar stirred into water vanishes without a trace. Where has it gone, and what decides how much of it can go there?Open this lesson
- 03FiltrationProcessGetting sand out of water takes one piece of paper. Getting salt out of water cannot be done with any paper at all — and the reason is a matter of size.Open this lesson
- 04Evaporation and crystallisationProcessThe salt is dissolved and invisible. Getting it back is easy — getting it back as crystals you can hold is a question of how much of a hurry you are in.Open this lesson
Back to all three sciences this half term The whole KS3 Chemistry course