Electrochemical Reactions (Grade 12 NSC Matric Physical Sciences): Quizzes

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Writing Redox and Half-Reactions
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What does OIL stand for in the OIL RIG mnemonic?

Oxidation Is Loss

What happens during oxidation?

An element or compound loses electrons

What does RIG stand for in the OIL RIG mnemonic?

Reduction Is Gain

What does an oxidising agent do in a redox reaction?

Gains electrons and is reduced

What does a reducing agent do in a redox reaction?

Loses electrons and is oxidised

In the half-reaction Fe2+(aq)→Fe3+(aq)+e−\text{Fe}^{2+}\text{(aq)} \rightarrow \text{Fe}^{3+}\text{(aq)} + e^-, what occurs?

Oxidation

What must be equal in a balanced redox reaction?

Electrons lost and electrons gained

What is added to balance redox reactions in acidic medium?

H2O\text{H}_2\text{O} and H+\text{H}^+ ions

What is added to balance redox reactions in alkaline medium?

OH−\text{OH}^- and H2O\text{H}_2\text{O}

For a reaction to be classified as redox, what must occur?

Both oxidation and reduction

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