Learning objective

Balance atoms and charges in redox equations.

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Flashcards

7

Questions

Topic

Oxidation, reduction and redox equations

Subtopic

Redox equations

AQA A Level ChemistryPhysical chemistry

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Understand this objective

Short explanation

To balance atoms and charges in redox equations, follow these steps: First, identify the oxidation and reduction half-reactions. Ensure that the number of atoms for each element is equal on both sides of the equation. Next, balance the charges by adding electrons (e-) to the more positive side of the half-reaction. For example, if a species is oxidized, add electrons to the product side; if reduced, add them to the reactant side. Finally, combine the half-reactions, ensuring that the electrons cancel out, resulting in a balanced overall redox equation. This process maintains both mass and charge conservation.

Key concepts

oxidationreduction

Why it matters

This objective helps connect Redox equations to exam-style questions, flashcards, and revision notes for Oxidation, reduction and redox equations.

Common mistakes

1 linked
  • Balancing Redox Equations Mistake: To balance a redox equation, first separate the oxidation and reduction half-equations. Ensure that both the number of atoms and the total charge are equal on both sides. For example, in the half-equation for the reduction of MnO4- to Mn2+, balance the manganese and oxygen atoms, then balance the charges by adding electrons. This ensures the final redox equation is accurate.

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