Most of the physical changes are reversible. Give some examples w…

Question

Most of the physical changes are reversible. Give some examples with reasons.

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Answer

Melting of ice into water is a reversible physical change because water can be frozen back into ice.
Inflating and deflating a balloon is also reversible because no new substance is formed.

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Observation : Table : Conduction of electricity by different objects or materials

Object/ Material	Observation (bulb glows/ does not glow)	Good conductor of electricity or poor conductor of electricity
Piece of aluminium foil	Bulb slows	Good conductor of electricity
Iron nail	Bulb slows	Good conductor of electricity
Lump of sulphur (peasized)	Bulb does not glow	Poor conductor of electricity
CooDer wire	Bulb slows	Good conductor of electricity
Piece of coal	Bulb does not glow	Poor conductor of electricity
Piece of dry wood	Bulb does not glow	Poor conductor of electricity
Stone	Bulb does not glow	Poor conductor of electricity