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Chemical Change

Question

Which of the following is a chemical change?
Boiling of eggs
Evaporation of water
Formation of snow
Melting of wax

A

Boiling of eggs

B

Evaporation of water

C

Formation of snow

D

Melting of wax

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Solution

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Chemical changes result in the formation of new substances, and the changes that occur cannot be reversed. The heat from boiling an egg causes the egg's protein to change permanently in texture. It is a chemical change.
Evaporation of water, formation of snow and melting of wax are physical changes, as no new substances are formed.

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Q1

Statement 1: Melting is a physical change as the melted wax can again be obtained as solid wax upon the removal of heat.
Statement 2: Burning of wax is a chemical change since the wax once burnt, cannot be returned back to its original form.
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(d) melting of candle wax on heating

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