
Concept explainers
Interpretation:
A balanced reaction for the given reactions has to be written.
Concept introduction:
- There is a law for conversion of mass in a
chemical reaction i.e., the mass of total amount of the product should be equal to the total mass of the reactants. - The concept of writing a balanced chemical reaction is depends on conversion of reactants into products.
- First write the reaction from the given information.
- Then count the number of atoms of each element in reactants as well as products.
- Finally obtained values could place it as coefficients of reactants as well as products.

Answer to Problem 21.33QP
The balanced reaction for the given reactions is
(a)
(b)
(c)
(d)
(e)
(f)
Explanation of Solution
(a)
Sodium metal reacts with water to produce sodium hydroxide and hydrogen gas.
Here, the reaction is unbalanced. So we need to balance it.
To balance the reaction, calculate the number of atoms present in left side and right side. Finally, obtained values could place it as coefficients of reactants as well as products.
(b)
An aqueous solution of
Here, the reaction is unbalanced. So we need to balance it.
To balance the reaction, calculate the number of atoms present in left side and right side. Finally, obtained values could place it as coefficients of reactants as well as products.
(c)
Solid
Here, the reaction is unbalanced. So we need to balance it.
To balance the reaction, calculate the number of atoms present in left side and right side. Finally, obtained values could place it as coefficients of reactants as well as products.
(d)
Solid
To balance the reaction, calculate the number of atoms present in left side and right side. Finally, obtained values could place it as coefficients of reactants as well as products. In this reaction equally conversion happened so that reaction is already balanced.
(e)
Solid
Here, the reaction is unbalanced. So we need to balance it.
To balance the reaction, calculate the number of atoms present in left side and right side. Finally, obtained values could place it as coefficients of reactants as well as products.
(f)
At normal temperatures sodium carbonate won’t go decomposition.
When we heat the solid
A balanced equation for the given reactions were written
(a)
(b)
(c)
(d)
(e)
(f)
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Chapter 21 Solutions
Chemistry: Atoms First V1
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