Question 3

Classify the following changes into reversible and irreversible changes:

Boiling of water

Melting of wax

Burning of paper

Stretching of a spring

Growth of a plant

Ageing of man

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Solution

Boiling of water – reversible change

Melting of wax – reversible change

Burning of paper – irreversible change

Stretching of a spring – reversible change

Growth of a plant – irreversible change

Ageing of Man – irreversible change

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Similar questions

Classify these changes into physical and chemical changes. [5 MARKS]

S.No	Change
1	Melting of Ice
2	Dissolving sugar in water
3	Burning rubber
4	Burning camphor
5	Melting Wax

Classify the following as a physical or a chemical change :

(a) Drying of wet clothes

(b) Manufacture of salt from seawater.

(d) Boiling of water

(e) Burning of paper

(f) Melting of wax

(g) Burning of coal

Classify the following examples into physical or chemical change. [1 MARK]

1) Photosynthesis and burning of coal

2) Dissolving sugar in water and melting of wax

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Digestion of food is a Q irreversible change. ( )
2. Rusting of iron is a reversible change. ( )
3. Melting of wax is a reversible change. ( )
4. Curding of milk is an irreversible change. ( )
5. Melting of ice cream is a reversible change. ( )

Q. Which of the following are physical changes and which are chemical changes ?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.

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Question 3 Classify the following changes into reversible and irreversible changes: Boiling of water Melting of wax Burning of paper Stretching of a spring Growth of a plant Ageing of man

Boiling of water – reversible change Melting of wax – reversible change Burning of paper – irreversible change Stretching of a spring – reversible change Growth of a plant – irreversible change Ageing of Man – irreversible change

Question 3

Classify the following changes into reversible and irreversible changes:

Boiling of water

Melting of wax

Burning of paper

Stretching of a spring

Growth of a plant

Ageing of man

Boiling of water – reversible change

Melting of wax – reversible change

Burning of paper – irreversible change

Stretching of a spring – reversible change

Growth of a plant – irreversible change

Ageing of Man – irreversible change