AQA · Physics · 8463
GCSE Physics: Changes of state
Particle model of matter · AQA GCSE Physics (8463), specification point 4.3.1.2. Cards are generated from the exam board's own specification for "Changes of state", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What happens to mass when a substance changes state?
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Mass is conserved — the total mass stays the same before and after the change.
When a substance melts, freezes, boils, evaporates, condenses or sublimates, its mass is ?.
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conserved
Are changes of state physical changes or chemical changes?
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Physical changes — no new substance is formed and the change can be reversed.
How does a physical change differ from a chemical change?
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In a physical change the material recovers its original properties if the change is reversed; a chemical change produces a new substance.
What is the name of the change of state from liquid to solid?
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Freezing.
What is the name of the change of state from gas to liquid?
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Condensing (condensation).
What is the name of the change of state directly from solid to gas?
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Sublimation.
The change of state from solid to liquid is called ?.
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melting
Why is ice melting into water classed as a physical change?
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Because the water can be frozen back into ice and recovers its original properties — no new substance is made.
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