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Solved: Balance each of the following redox reactions and
Chapter 4, Problem 67P(choose chapter or problem)
Balance each of the following redox reactions and classify it as a combination, decomposition, or displacement reaction:
(a) Mg(s) + H2O(g) → Mg(OH)2(s) + H2(g)
(b) Cr(NO3)3(aq) + Al(s) → Al(NO3)3(aq) + Cr(s)
(c) PF3(g) + F2(g) → PF5(g)
Questions & Answers
QUESTION: Problem 67P
Balance each of the following redox reactions and classify it as a combination, decomposition, or displacement reaction:
(a) Mg(s) + H2O(g) → Mg(OH)2(s) + H2(g)
(b) Cr(NO3)3(aq) + Al(s) → Al(NO3)3(aq) + Cr(s)
(c) PF3(g) + F2(g) → PF5(g)
ANSWER:
Solution 67P:
Here, we are going to identify the following reactions.
Step 1:
Redox reaction:
It is a reaction where the electrons transfer from one reactant to another.
For example:
The formation of water from the reaction of hydrogen and oxygen molecule.
There are three type of redox reactions:
- Combination reactions:
In the combination reaction, two or more reactant combine together to form the product.
For example:
The formation of NH3 (g).
(b) Decomposition reactions
In the decomposition reaction, one reactant forms two or more products.
For example:
Thermal decomposition of KClO3(s)
(c) Displacement reactions:
In the displacement reaction, the number of atoms remain same for the reactant and product but the atoms exchange take place.
For example:
Zn(s) displaces the Cu2+ ion from CuSO4 solution