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Question


A chemical equation should be balanced because:


Options:
A .   mass is conserved in a chemical reaction.
B .   number of atoms before and after the reaction is same.
C .   the chemical equation should look good.
D .   energy is conserved in a chemical reaction.
Answer: Option A
:
A and B

Mass can neither be created nor destroyed in a chemical reaction, i.e. mass is conserved in a chemical reaction. This implies that the number of atoms before and after the reaction should be the same. So a chemical equation should be balanced.



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