Question

Define
a. A physical change
b. a chemical change
Give an example for above two changes​

Answer 1

(a) (i)chemical change: A temporary change in which no new substance is formed, the composition of substance remains the same, though its state, shape and size may change.

(ii) Chemical change: A permanent change in which new substances are formed whose composition and properties are completely different from those of the original substances.

(b) Physical change: (i) Change of water into its vapors.

(ii) Heating of iron rod.

Chemical change:

(i) Burning of wood. (ii) Breathing.

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Answer 2

Answer:

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