Choose a method to separate a mixture
The idea
List the materials and the property that differs between them.
Step by step
- List the materials and the property that differs between them.
- A sieve separates by size; a magnet attracts certain materials; a filter retains insoluble particles.
- Dissolved salt passes through an ordinary paper filter, but water can be evaporated to leave salt.
Example
Dry sand and large pebbles must be separated using their different sizes. Which method fits?
Answer
sieving
A sieve lets small sand grains pass while retaining large pebbles.
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Plan, without tasting materials, how to separate clean pebbles and sand. Name the property used.
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