Question

Give a reason why freezing of water is a reversible change while burning of a candle is an irreversible change. Answer in brief no unusual answer should be written if so it will be reported.

Answer 1

If we freeze water it becomes ice and we can again melt that ice by heating to get the water. Hence, it's a. reversible change since we are getting back the water.

But, if a candle is burnt, we will not get the candle back and hence it is an irreversible change.

Answer 2

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

Explanation:

• Freezing of water is reversible change as on heating frozen ice changes to water by heating. Because after freezing water changes to solid form. When we hear it or leave for some time the freezed water regain its original form(liquid). Hence freezing of water is reversible change.
• Burning of candle is irreversible change as on reversing the conditions we cannot get candle back out of $CO_2$, water vapors and wax vapors. The burning of candle wax to form hydrocarbons is a chemical change. The burning of the candle wick is a chemical/irreversible change. While the melting of wax is reversible, It can be again used after it has been melted as it gets back to its original form once the temperature gets lower.

Learn more about change

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