Question

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Answer 1

Question:-

Which activity involves only a physical change?

• Drying of wet clothes on a clothing line.
• Switching on an electric stove.
• Drying of cement on a brick wall.
• Both (A) and (B)

Answer:-

Drying of wet clothes in a clothing line is a complete physical change.

More Information:-

The changes that can be reversed and do not involve the formation of new substance are physical changes.

• Drying of clothes.
• Freezing of water.
• Melting of ice.

Characteristics of physical changes:-

• No new substance is formed.
• The change is temporary.
• The change can be reversed.
• The composition of matter remains unaltered.
• There maybe some changes in physical properties, such as state, colour, odour, etc.

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The changes that cannot be reversed and involve the formation of new substances are chemical changes.

• Curdling of milk.
• Burning of wood into coal.
• Formation of manure.

Characteristics of chemical changes:-

• An entirely new substance is formed.
• The change is permanent.
• The change is irreversible.
• Changes in composition and properties may take place.
• Heat or light may be given off or absorbed.