1.

(a) Define:(i) a physical change(ii) a chemical change(b) Give two examples for each of the above two changes.

Answer»

(a) (i) Physical 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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