Balancing Redox Reactions Worksheet
A Grade 10 science worksheet focusing on balancing oxidation-reduction reactions using the half-reaction method in both acidic and basic solutions.
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Balancing Oxidation Reduction Reactions
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Read each question carefully and provide detailed answers. Show all your work for balancing redox reactions. Remember to balance atoms and charge.
1. In an oxidation-reduction (redox) reaction, what happens to the species that is oxidized?
It gains electrons and its oxidation number decreases.
It loses electrons and its oxidation number increases.
It gains protons and its oxidation number decreases.
It loses protons and its oxidation number increases.
2. Which of the following is NOT a step in balancing redox reactions using the half-reaction method in acidic solution?
Balance oxygen atoms by adding H₂O.
Balance hydrogen atoms by adding OH⁻.
Balance charge by adding electrons.
Multiply half-reactions to equalize electrons.
3. In a basic solution, to balance hydrogen atoms, you add to the side needing hydrogen, and an equal number of to the opposite side.
4. The reducing agent is the species that gets , causing the other species to be .
5. Explain the difference between oxidation and reduction in terms of electron transfer and change in oxidation number.
6. Balance the following redox reaction in acidic solution:
Cr₂O₇²⁻(aq) + C₂O₄²⁻(aq) → Cr³⁺(aq) + CO₂(g)
7. Balance the following redox reaction in basic solution:
MnO₄⁻(aq) + C₂O₄²⁻(aq) → MnO₂(s) + CO₃²⁻(aq)
8. The oxidation number of an element in its elemental form is always zero.
True
False