Curriculum
Science — Second Preparatory
Unit 1: Matter and Energy
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Unit 2: Matter and Chemical Reactions
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Unit 3: Energy Flow in Photosynthesis and Respiration
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Unit 4: Geological Processes
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Text lesson
Changes of State
Changes of State
Names of the changes and their link to heat
Names of the changes and their link to heat
| Change | Direction | Heat |
|---|---|---|
| Melting | Solid to liquid | Absorbed |
| Freezing | Liquid to solid | Released |
| Vaporisation (evaporation or boiling) | Liquid to gas | Absorbed |
| Condensation | Gas to liquid | Released |
| Sublimation | Solid to gas directly | Absorbed |
| Deposition | Gas to solid directly | Released |
Important rule→a change that moves matter to a state with more energy (melting, vaporisation and sublimation) needs heat to be absorbed. A change in the opposite direction releases heat.
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