This question is about separating mixtures.
The table shows some mixtures.
Use words from the list: crystallisation, filtration, fractional distillation, simple distillation
| Mixture to separate | Best method |
|---|---|
| sand from water | ? |
| copper sulfate crystals from copper sulfate solution | ? |
| pure water from seawater | ? |
| ethanol from a mixture of ethanol and water | ? |
Complete the table. Each method can be used once.
A student filters a mixture of sand and salt solution.
Name the substance that stays on the filter paper.
Explain why the salt passes through the filter paper.
In simple distillation, steam passes into a condenser and turns back into liquid water.
Explain why the steam turns back into a liquid in the condenser.
51 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.