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

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Half Equations & Ionic Equations
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Half equations represent

Oxidation or reduction processes in redox reactions

Half equations show

How electrons are transferred

Oxidation is

Loss of electrons

Reduction is

Gain of electrons

Half equation for sodium oxidation

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

Half equation for chlorine reduction

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

When balancing half equations

Electrons lost must equal electrons gained

Ionic equations show

Only species directly involved in the reaction

Spectator ions are

Ions that don't change during the reaction

First step for an ionic equation

Write the balanced chemical equation

Spectator ions in ionic equations

Are removed/omitted

Ag+(aq)+Cl−(aq)\text{Ag}^+ (aq) + \text{Cl}^- (aq) forms

AgCl(s)\text{AgCl} (s)

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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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