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Evaporating

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Key Stage 2

Meaning

Evaporating is when a liquid turns into a gas.

Noun: Evaporation
Verb: To evaporate
Present Participle: Evaporating
When you heat a liquid:
Evaporating.png
A liquid will evaporate to become a gas.

About Evaporating

Heating a liquid will cause it to evaporate into a gas.
Evaporation is a reversible process. When a liquid evaporates into a gas you can condense that gas back into a liquid.
You may have seen these evaporating:
  • Water
  • Hand Gel

Examples

BoilingWater.png
AlcoholHandGel.png
When water is boiling the liquid evaporates turning into a gas. Eventually all the liquid will be gone and the room will be filled with water vapour. When you use Hand Gel the liquid quickly evaporates from your hands so you don't need to dry them.

Key Stage 3

Meaning

Evaporating is an endothermic process in which a liquid turns into a gas.

About Evaporating

Evaporation is a reversible process. When a liquid evaporates into a gas you can condense that gas back into a liquid.
Heating a liquid will cause it to evaporate more quickly into a gas.
When you heat a liquid:
ParticleModelEvaporating.png
The particles in the liquid move faster until they are moving fast enough that they break the bonds holding the particles together. The particles become free to move anywhere which makes the state a gas.

Key Stage 4

Meaning

Evaporating is an endothermic physical change in which the particles on the surface of a liquid are able to escape the liquid to become part of a gas.

About Evaporating

Evaporating is different from boiling because:
  1. Evaporation happens from the surface of the liquid.
  2. Evaporation can happen at temperatures below the boiling point of the liquid.
Evaporating happens when some particles at the surface of a liquid have enough energy to escape the bonds holding the particles together in the liquid.
Evaporation is an endothermic process, which means it needs to absorb energy to take place. When liquids evaporate the temperature of the liquid decreases as the energy is taken away by the particles escaping the liquid.
Evaporating is a physical change, which means it is reversible and does not produce new chemicals.

References

AQA

Evaporation, page 100, GCSE Combined Science Trilogy; Physics, CGP, AQA
Evaporation, page 112, GCSE Biology; The Revision Guide, CGP, AQA
Evaporation, page 23, GCSE Chemistry, Hodder, AQA
Evaporation, page 269, GCSE Combined Science Trilogy; Biology, CGP, AQA
Evaporation, page 330, GCSE Biology, CGP, AQA
Evaporation, page 38, GCSE Chemistry, CGP, AQA
Evaporation, page 38, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
Evaporation, page 72 GCSE Physics, Hodder, AQA
Evaporation, page 81, GCSE Physics; Third Edition, Oxford University Press, AQA
Evaporation, pages 17, 37, GCSE Chemistry; The Revision Guide, CGP, AQA
Evaporation, pages 66-69, 272-273, 279, GCSE Biology; Third Edition, Oxford University Press, AQA
Evaporation, pages 9-10, GCSE Chemistry; Third Edition, Oxford University Press, AQA
Evaporation, pages 97, GCSE Combined Science Trilogy 2, Hodder, AQA
Evaporation, pages, 137, 138, 324, GCSE Combined Science Trilogy 1, Hodder, AQA
Evaporation, pages, 69, 114, 329, GCSE Chemistry; Student Book, Collins, AQA
Evaporations, page 110, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Evaporations, pages 39, 40, GCSE Physics; The Revision Guide, CGP, AQA

Edexcel

Evaporation, page 35, GCSE Chemistry; The Revision Guide, CGP, Edexcel
Evaporation, page 98, GCSE Combined Science; The Revision Guide, CGP, Edexcel
Evaporation, pages 10, 152, GCSE Chemistry, Pearson, Edexcel
Evaporation, pages 154, 266, GCSE Combined Science, Pearson Edexcel

OCR

Evaporating, pages 44, 82, 152, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR