Half Equations & Ionic Equations (AQA GCSE Chemistry): Quizzes

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Half Equations & Ionic Equations
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What do half equations show in redox reactions?

How electrons are transferred

In a half equation, what is oxidation?

Loss of electrons

In a half equation, what is reduction?

Gain of electrons

Which equation shows sodium undergoing oxidation?

Na→Na++e−\text{Na} \rightarrow \text{Na}^+ + e^-

Which equation shows chlorine undergoing reduction?

Cl2+2e−→2Cl−\text{Cl}_2 + 2e^- \rightarrow 2\text{Cl}^-

When balancing half equations, what must be equal?

Electrons lost and electrons gained

What do ionic equations show?

Only the species directly involved in the reaction

What are spectator ions?

Ions unchanged during the reaction

In the AgNO₃ and NaCl reaction, which are spectator ions?

Na+\text{Na}^+ and NO3−\text{NO}_3^-

What is the ionic equation for AgNO₃ and NaCl reaction?

Ag+(aq)+Cl−(aq)→AgCl(s)\text{Ag}^+ (aq) + \text{Cl}^- (aq) \rightarrow \text{AgCl} (s)

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