Separating mixtures
Integrated Science · Grade 7 · Term 3 · Tue 6 Oct 2026
Specific learning outcomes
- Name 4 methods used to separate mixtures.
- Separate a mixture of sand and salt using filtration and evaporation.
- Appreciate how separating mixtures is used at home and in industry.
Key inquiry questions
How can we separate the parts of a mixture?
Where do we separate mixtures in everyday life?
Learning resources
Sand, table salt, water, beakers, filter paper, funnels, evaporating dishes, a spirit lamp, safety goggles and the learner's book.
Introduction
Show the class a jar of muddy water and ask how they would make it clean enough to use. List their ideas on the board.
Lesson development · Step 1
- In groups, learners mix sand, salt and water and describe each part of the mixture.
- Guide each group to filter the mixture and note what stays on the filter paper.
- Learners record the residue and the filtrate in a table.
Lesson development · Step 2
- Learners heat the filtrate in an evaporating dish until only the salt remains.
- Each group explains which property of salt and sand made each method work.
- Discuss other methods: decanting, sieving, picking and using a magnet.
Conclusion
Learners summarise the steps they followed and match each method to a mixture it can separate.
Differentiation & inclusion
- Pair learners who need support with a peer for the recording table.
- Challenge fast finishers to plan how to separate iron filings, sand and salt.
- Give learners with low vision large-print labels for the apparatus.
Extended activities
At home, learners find 2 examples of separating mixtures, such as sieving flour, and describe each in their notebooks.