SC-367

Changes of state

Lower Sec Science · Secondary 1 · Hard · Changes of state

A solid substance is heated from

30^\circ\text{C}

90^\circ\text{C}

. It starts melting at

50^\circ\text{C}

and finishes melting at

50^\circ\text{C}

. During melting, the temperature stays constant. Using the particle model, what happens to the particles while the temperature remains at

50^\circ\text{C}

Particles stop moving completely so the temperature stays the same.
Particles move faster and faster, so the temperature stays the same.
Particles gain energy to break free from their fixed positions without getting faster overall.
Particles lose energy and move closer together, so the temperature stays the same.

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