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luo

Which is an example of a chemical change?

water evaporating from a puddle

cloth tearing when pulled

wood forming sawdust when cut

bread baking in an oven

Bread baking in an oven

it can not go back to its original state after baking so it is chemical

The correct answer is option : ' bread baking in an oven'.

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

Example: Melting of ice

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Corrosion of iron called as rusting.

1) Water evaporating from a puddle : It is a physical change as water form its liquid state is converting into gaseous state.

2) Cloth tearing when pulled : Its a change in shape of cloth due to action of force. Since its size is changing but the chemical composition is still the same, physical change.

3) Wood forming sawdust when cut : Its a change in shape and size of wood due to action of saw. Since its size and shape are changing but the chemical composition is still the same, physical change.

4) Bread baking in an oven : It is a chemical change because new substance is formed. Here, due to action of heat the dough rises as evolution of gas takes place.