Question

1. How do changes occur?
(a) by cooling
(b) by heating
(c) by applying pressure
(d) all of these
2. When does an object expand?
(a) on cooling
(b) on heating
(c) on applying pressure
(d) all of these​

Answer 1

Answer:

Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.

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