
Concept explainers
Interpretation :
While balancing a chemical equation change of the subscripts are not permitted. The reason must be explained. The effect of changing the subscripts must also be explained.
Concept Introduction :
A balanced chemical equation represents a

Answer to Problem 30A
Change of number of subscripts is not permitted while balancing a chemical equation because that will change the chemical formula of the species.
Explanation of Solution
To balance the above equation the coefficients must be taken in such a way that number of each atoms become same without changing the formula of any species involved in the reaction.
The balanced chemical equation is given below.
Another way to balance the equation is given below which is not permitted.
In this case formula of AgCl is changed to Ag2Cl2 which is not allowed.
Number of atoms is counted in both the side of an equation to check that a reaction is balanced.
Chapter 7 Solutions
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