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Question
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
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
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Solution
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
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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