EasyChemistryHigh School (9–10)GeneralMixtures and Solutions › Mixtures, Solutions and ColloidsConceptual

Decide whether each is a solution, a colloid or a suspension, and give one reason.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Copper sulphate in water
Shaving foam
Chalk powder stirred in water
Jelly
Soda water

Need a reminder? The key ideaShow

Solution: particles under $1\ \text{nm}$ , invisible, never settle, pass through filters, do not scatter light. Colloid: $1\ \text{nm}$ to $1000\ \text{nm}$ , 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.

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← Potassium nitrate dissolves 169 g in 100 g of water at 80 °C, and 46 g at 30 °C.A liquid looks like one clear, uniform substance. →

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