EasyChemistryHigh School (9–10)GeneralMixtures and Solutions › Mixtures, Solutions and ColloidsConceptualBoard Exam
Decide whether each is a solution, a colloid or a suspension, and give one reason…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Decide whether each is a solution, a colloid or a suspension, and give one reason.
- Copper sulphate in water
- Shaving foam
- Chalk powder stirred in water
- Jelly
- Soda water
Need a reminder? The key ideaShow
Solution: particles under , invisible, never settle, pass through filters, do not scatter light. Colloid: to , never settle, cannot be filtered, scatter light (the Tyndall effect). Suspension: large particles that can be seen, settle and can be filtered.
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. Solutions. (a) Copper sulphate dissolves completely: clear, blue, and nothing settles. (e) Soda water is carbon dioxide dissolved in water.
Step 2. Colloids. (b) Shaving foam is tiny bubbles of gas spread in a liquid. (d) Jelly is a liquid spread through a solid. Neither settles.
Step 3. A suspension. (c) The chalk particles can be seen, and they settle at the bottom.
Answer: (a) and (e) solutions; (b) and (d) colloids; (c) a suspension.
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