Separation, tests, air and water
Free ESAT Chemistry lesson. Worked examples, common mistakes and a self-check.
What the lesson covers
- Physical separation: filtering, evaporating, crystallising
- Distillation, separating funnels and centrifuges
- Chromatography and purity
- Tests for gases and for water
- Tests for ions: anions, cations and flame tests
- Air: composition and fractional distillation
- Greenhouse gases, pollutants and drinking water
- Putting it together: identifying an unknown
- Self-check questions with answers (8)
Specification: C8.1-8.4, C16.1-16.5, C17.1-17.4. Codes follow the UAT-UK ESAT content specification.
How to use it
- Read a section, then cover the worked example and try it yourself.
- Check the common mistakes list: these are the slips the real test is built to catch.
- Do the self-check without looking back. Mark it against the answers.
- Then practise the topic under time, with the matching practice set.
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