Question

classify and tabulate them in to physical changes and chemical changes
options:1) wood is cut in to small pieces
2) melting of wax
3) burning of fire wood
4)water turns into water vapour
5) sparklers emit light​

Answer 1

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Chemical change:-

A substance is said to undergo a physical change when only the physical properties such as the shape, size, colour, state or appearance of the substance change. Its chemical composition remains intact.

Physical change :-

A substance is said to undergo a chemical change when the chemical properties of a substance alter. As a result, there is either formation or breaking of atomic bonds at the molecular level.

• 1) wood is cut in to small pieces :- Chemical change
• 2) melting of wax:- Physical Change
• 3) burning of fire wood:- Chemical Change
• 4)water turns into water vapour:- Physical change
• 5) sparklers emit light:- Physical change

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