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

The beams of a car's headlights can be seen clearly on a foggy night, but not on a clear night.

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

The beams of a car's headlights can be seen clearly on a foggy night, but not on a clear night. Explain.
Would you see the beam in a room full of smoke? Why?

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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