Question

Q6. On what basis is a chemical equation balanced?State any two observations in an activity suggesting the occurrence of a chemical reaction.​

Answer 1

ANSWER:—

Chemical equation is balanced on the basis of law of conservation of mass ,i.e.number of atoms on the left side (reactants) should be equal to number of atoms on the right side (products).

A Chemical equation is always balanced on comparison of number of atoms of each element on both sides of the reaction.

A chemical change be Also, when calcium carbonate is heated,

it decomposes to form calcium oxide and carbon dioxide.

In this reaction, calcium carbonate breaks down to form calcium oxide and carbon dioxide.

Here, evolution of the gas (carbon dioxide) confirms that a chemical reaction has taken place.

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