Half Equations & Ionic Equations (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Quizzes

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Half Equations & Ionic Equations
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What do half equations represent in chemistry?

Oxidation or reduction processes

In half equations, what is oxidation?

Loss of electrons

In half equations, what is reduction?

Gain of electrons

Which equation shows oxidation of sodium?

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

Which equation shows reduction of chlorine?

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

When balancing half equations, what must be equal?

Electrons lost and gained

What do ionic equations show?

Only species directly involved

What are spectator ions?

Ions that don't change in a reaction

What is the first step in writing an ionic equation?

Write the balanced chemical equation

What happens to spectator ions in ionic equations?

They are removed

In AgNO3+NaCl→AgCl+NaNO3\text{AgNO}_3 + \text{NaCl} \rightarrow \text{AgCl} + \text{NaNO}_3, which are spectator ions?

Na+\text{Na}^+ and NO3−\text{NO}_3^-

What is the ionic equation for AgNO3+NaCl→AgCl+NaNO3\text{AgNO}_3 + \text{NaCl} \rightarrow \text{AgCl} + \text{NaNO}_3?

Ag++Cl−→AgCl\text{Ag}^+ + \text{Cl}^- \rightarrow \text{AgCl}

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Simple Model of the Atom

The Periodic Table

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Simple Model of the Atom

The Periodic Table

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Simple Model of the Atom

The Periodic Table

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Simple Model of the Atom

The Periodic Table

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