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Combustible and Non-Combustible Substances

Explain why, ...

Question

Explain why, burning of wood is said to be an irreversible change, while boiling of water is said to be reversible change.

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Solution

Wood cannot be obtained back after burning it. Hence burning of wood is a irreversible change.
The boiling of water is a reversible change as water vapours can be converted back to liquid water by cooling.

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Similar questions

Q. Fill in the blanks with the correct words.
1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
4. Breaking of glass is a .................... (physical/chemical) change.
5. .................... (Heating/Cooling) causes steam to change into water.

Q. Give a reason, why?

A. Freezing of water is a reversible change while burning of a candle an irreversible change.

B. Change of seasons is a periodic change while the burning of weather is a non-periodic change.

Explain why the melting of ice into water is said to be a physical change.

Q. Which of these is an irreversible change?
(a) Melting of wax
(b) Freezing of water
(c) Boiling of water
(d) Burning of paper

Q. Why is burning of paper an irreversible change?

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Combustible and Non-Combustible Substances

Standard VIII Chemistry

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