Choose a method to separate each mixture, and name the property it uses.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Choose a method to separate each mixture, and name the property it uses.
- Tea leaves from tea
- Butter from curd
- Iodine from salt
- Petrol from kerosene
- The dyes in a green food colour
Need a reminder? The key ideaShow
A separation uses a difference in a property. Filtration: a solid that does not dissolve. Evaporation: a dissolved solid. Separating funnel: liquids that do not mix. Centrifuge: tiny particles. Sublimation: a solid that sublimes. A magnet: iron.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Filtration (a strainer): the leaves are too big to pass through.
Step 2. (b) Centrifugation (churning): butter's fat is less dense than the rest.
Step 3. (c) Sublimation: iodine sublimes, and salt does not.
Step 4. (d) Fractional distillation: the two liquids mix, and their boiling points are different.
Step 5. (e) Chromatography: each dye travels a different distance on paper.
Answer: (a) filtration, (b) centrifugation, (c) sublimation, (d) fractional distillation, (e) chromatography.
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