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

A liquid looks like one clear, uniform substance.

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

A liquid looks like one clear, uniform substance. A beam of light from a torch passes through it, and the path of the beam can be seen.

Is the liquid a true solution? Explain.
What kind of mixture could it be?
Describe one more test that shows it is not a suspension.

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.

← All Problems

← Decide whether each is a solution, a colloid or a suspension, and give one reason.The beams of a car's headlights can be seen clearly on a foggy night, but not on a clear night. →

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