Question

The diagram shows a phase change.



What is most likely happening to the energy and the movement of particles as the phase changes?

a
Energy is being added and they are moving faster and changing from a solid to a liquid
b
Energy is being removed and they are moving slower and changing from a solid to a liquid.
c
Enegy is being added and they are moving faster and changing from a liquid to a gas.
d
Energy is being removed and they are moving slower and changing from a liquid to a gas.
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Answer 1

I can’t see the diagram — can you upload or describe it?

General rule: adding energy (heating) makes particles move faster and drives phase changes in the direction solid → liquid → gas; removing energy (cooling) makes particles move slower and drives gas → liquid → solid.

So:
- If the diagram shows melting (solid → liquid) the correct choice is a.
- If it shows boiling/evaporation (liquid → gas) the correct choice is c.
- Choices b and d are inconsistent (they claim energy is removed but give the forward-phase directions).