(a) List the changes that can help in identifying a chemical change.
(b)Why mass does not change during a chemical reaction?

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Solution

As per the law of conservation of mass, during a chemical reaction, there is no change in the total mass of the substance. So, mass does not change in reaction.

(a) The indicators of chemical reactions include:

Change in tempretur

Change in colour

Formation of precipitate

Evaluation of gases

Change in colour

(b) As per the law of conservation of mass, during a chemical reaction, there is no change in the total mass of the substance. So, mass does not change in reaction.

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Similar questions

While teaching the topic of physical and chemical changes, Mahima’s teacher listed the conditions that take place during a change.

I. Change in state

II. Change in colour

III. Evolution of a gas

IV. Change in temperature

He then asked Mahima to identify the conditions based on which it can be said with certainty that a particular change is chemical in nature.

Among the changes that are listed by the teacher, which changes should be selected by Mahima?

Will the mass of t he catalyst change during a chemical reaction?

During a chemical change there is a change in the mass of original substance:

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