
To write:
The complete and balanced chemical equation for the given incomplete reactions.

Answer to Problem 7.23QA
Solution:
a.
b.
c.
d.
Explanation of Solution
First, we write the complete and balanced chemical equation describing complete combustion. Combustion involves a rapid reaction with
a.
Atoms:
There is only one
Atoms:
There are two
we place a coefficient of
Atoms:
There are ten
Atoms:
Both sides of reaction have the same number of each element. Therefore, this reaction is balanced.
b.
Atoms:
There is only one
Atoms:
There are two
Atoms:
This balances the number of
Atoms:
We can now balance the number of
Atoms:
c.
Atoms:
There is only one
Atoms:
There are two
we place a coefficient of
Atoms:
This balances the number of
Atoms:
We can now balance the number of
Atoms:
d.
Atoms:
There is only one
Atoms:
There are two
we place a coefficient of
Atoms:
This balances the number of
Atoms:
We can now balance the number of
Atoms:
Conclusion:
Balancing each atom on both sides of reaction arrow balances the entire reaction.
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Chapter 7 Solutions
Chemistry: An Atoms-Focused Approach
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