Question

Sort the changes given below as physical and chemical changes ( give reason also ) a) melting of butter b) haircut c) colouring of hair d) burning of wood​

Answer 1

b,c and e are chemical changes as these changes can not reversed.

and the reactants can't be back.

Answer 2

(a) Melting of butter comes under a physical change because, it can be solidified again and there is no chemical reaction happened. In melting of butter only the state matters.

(b) Hair cut also comes under a physical change, because if we cut our hair, it has an ability to grow again and there is no chemical reaction found here.

(c) Again, Colouring of hair comes under a periodic change since it is a reversible process.

(d) Burning of wood comes under in chemical change because, when we burn wood becomes as ash. Now, in this change wood is turning into ash this means it is forming a new substance, and this change under goes a chemical reaction which is involved by heat energy so, we say burning of wood is a chemical change.

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