Question

list any two way to change any substance permanently and temporary respectively?

Answer 1

milk changes into curd permanent
water changes into ice cubes and ice cubes changes into water it is a temporary form


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Answer 2

List of two way to change any substance permanently and temporary respectively:

Substance: Paper

• Way to change the paper permanently:

The permanent change denotes irreversible reaction. It gives rise to an end product. For example, when we burn the paper, it gets permanently changed into ash and form the ash the paper cannot be obtained back. Secondly the paper in which drawing is done with pen or oil color is permanent.  

• Way to change the paper temporarily:

The permanent change denotes reversible reaction. It doesn’t give end product. For example, making a puppet with paper is reversible, when we draw in the paper using the pencil we can again make it plain by rubbing it rubber.