Question

Whta will you take into account while identifying the following?
a) A physical change in a substance.
b) A chemical change in a substance.

Answer 1

Thanks for asking the question!

ANSWER::

a)A physical change in a substance
Physical change is that change in which the physical properties of substance can be reversed i.e. size or shape.
Examples - Occurrence of an earthquake , Revolution of the earth around the sun ,Stretching of a spring 

b)A chemical change in a substance.
Chemical change is that change in which a substance combines with another to form new substance or it is a change which causes a new substance to form.
Examples - Conversion of milk into yoghurt , Bursting of a cracker etc.

Hope it helps!

Answer 2

Answer:

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