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

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Half Equations & Ionic Equations
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What do half equations represent?

Oxidation or reduction processes

What do half equations show?

How electrons are transferred

In half equations, what is oxidation?

Loss of electrons

In half equations, what is reduction?

Gain of electrons

Which equation shows sodium oxidation?

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

Which equation shows chlorine 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 species directly in the reaction

What are spectator ions?

Ions that don't change in the reaction

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

Na+\text{Na}^+ and NO3−\text{NO}_3^-

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