CH-1548
States of matter
Chemistry · Secondary 4 · Medium · States of matter
A student heats a solid until it melts completely, then allows it to cool. The cooling curve shows a horizontal section from 70 °C to 60 °C.
What happens to the particles during this horizontal section?
What happens to the particles during this horizontal section?
- They move further apart and gain kinetic energy.
- They become closer together but keep the same average speed.
- They become randomly arranged and move faster.
- They stay fixed in position and lose kinetic energy.
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