Classify the following changes as physical or chemical changes

Evaporation of alcohol

Expansion of air

Chewing food

Dissolving salt in water

Cooling a mixture of air and kerosene vapour

Burning a mixture of air and kerosene vapour

Pulling copper into thin wire

Tarnishing of jewellery

Evaporation of alcohol – physical change

Expansion of air  - physical change

Chewing food – physical change

Dissolving salt in water – physical change

Cooling a mixture of air and kerosene vapour – physical change

Burning a mixture of air and kerosene vapour – chemical change

Pulling copper into thin wire – physical change

Tarnishing of jewellery – chemical change

 

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