Half Equations & Ionic Equations (OCR GCSE Chemistry A (Gateway Science Suite)): 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 a half equation, what is oxidation?

Loss of electrons

In a half equation, what is reduction?

Gain of electrons

Which half equation shows oxidation of sodium?

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

Which half 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 electrons gained

What do ionic equations show?

Only species directly involved

What are spectator ions?

Ions that don't change in the reaction

What is the first step in writing an ionic equation?

Write the balanced chemical equation

In the reaction 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}

Explore OCR GCSE Chemistry A (Gateway Science Suite) Revision Notes by Topics

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Explore OCR GCSE Chemistry A (Gateway Science Suite) Model Answers by Topics

Simple Model of the Atom

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Explore OCR GCSE Chemistry A (Gateway Science Suite) Flashcards by Topics

Simple Model of the Atom

The Periodic Table

Properties of Transition Metals

Explore OCR GCSE Chemistry A (Gateway Science Suite) Exam Questions by Topics

Simple Model of the Atom

The Periodic Table

Properties of Transition Metals

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