Question

Worksheet 1. Which change is shown in the above pictures ? 3. Is there any new substance formed during the above reaction ? 2. Give two reasons why the above change is classified so ? 4. Is there any change in weight ?
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Answer 1

Answer:

the molecules of the substances do not change.

(b) the molecules of the substances change.

(c) atoms forming the molecules undergo changes.

(d) new substances are formed.

ANSWER:

(a) The molecules of the substances do not change.

Physical changes are reversible, the molecules of the substance remain exactly the same before and after the physical change.