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Physical and Chemical Changes

Which of the ...

Question

Question 1

Which of the following is not a physical change?

(a) Boiling of water to give water vapour
(b) Melting of ice to give water
(c) Dissolution of salt in water
(d) Combustion of Liquefied Petroleum Gas (LPG)

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Solution

Combustion of Liquefied Petroleum Gas (LPG) is a chemical change because it is an irreversible chemical reaction. It involves formation of new products like carbon dioxide, water vapour alongwith a lot of heat.

In rest of the cases, only physical state is changing and no new products are formed. Hence, they are physical changes.

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Similar questions

Classify the following as physical or chemical changes:

(i) Cooking of food (ii) Boiling of water

(iii) Cutting of trees (iv) Dissolving salt in water

(v) Digestion of food (vi) Melting of ice

Some changes are given below.

(a) Freezing of water

(b) Melting of ice

(c) Boiling of water

Are these considered as physical changes? If yes, give the reason.

Question 30
Which among the following are physical or chemical changes?

(a) Evaporation of petrol.

(b) Burning of Liquefied Petroleum Gas (LPG).

(d) Curdling of milk.

(e) Sublimation of solid ammonium chloride.

Classify the following as chemical or physical changes:

• Cutting of trees

• Melting of butter in a pan

• Rusting of almirah

• Boiling of water to form steam

• Passing of electric current through water, and water breaking down into hydrogen and oxygen gas

• Dissolving common salt in water

• Making a fruit salad with raw fruits

• Burning of paper and wood

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