Question

Which of the following is a physical change that cannot be reversed ?
1)Grinding of wood to sawdust
2)dissolving of salt in water
3)melting of ice
4)making a paper plane
fake answer=report

Answer 1

Answer:

Physical Changes: -

Dissolving sugar in water

Melting of wax

Beating Aluminium to make Aluminium foil.

Chemical Changes:-

Photosynthesis

Burning of Coal

Digestion of food

Explanation:

Answer 2

Answer:

a) Grinding of Wood to Sawdust

Explanation:

We can again gain salt which is dissolved in water

We can again make ice of the melted ice

We can again unfold the paper plane and we will get a paper

But converting of sawdust again to wood is not possible

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