Question

While lighting a candle, Geeta observed the changes.Identify and give reason. *
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Answer 1

Explanation:

Wax was melting and Melted wax was getting solidified because it is a reversible process.

Answer 2

Melting of wax is a physical change where the physical state of wax changes from solid to liquid. The melted wax that solidifies, can be changed to a liquid state on heating. These two are physical changes and thus, can be reversed.

● Burning of candle is a chemical change which involves breaking of chemical bonds in a process called combustion.

● The size of the burning candle reduces due to this change and cannot be reversed immediately.

● These two changes involve changes in chemical properties and thus cannot be reversed.

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