Question

Explain why decomposition of sugar on heating is an irreversible change.

Answer 1

The crystalline structure of sucrose breaks down and the molecules decompose into glucose and fructose and then lose water and then become isomers and polymerize to form caramel, a red-orange colored solid at room temperature

OR

sugar is made up of carbon ,hydrogen oxygen atoms . when heated over the candle these element react with fire to turn into liquid the heat cause a sugar atom to combine with oxygen in the air forming new group of atom

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Answer 2

Answer:

yes it is a chemical change and is also irreversible

Explanation:

when sugar is heated it combines with heat energy to form a new substance,that's why it is a chemical change and it can't come back to it's original form that's why it is irreversible.