Predicting Reactions (AQA A-Level Chemistry): Flashcards

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Predicting Reactions
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Use of EθE^\theta values

Predict direction of redox reactions

Positive EcellθE^\theta_{\text{cell}} indicates

Reaction is feasible in predicted direction

Initial format for half-equations

As reduction reactions (gaining electrons)

EθE^\theta value undergoing oxidation

More negative EθE^\theta value

EθE^\theta value undergoing reduction

Less negative or more positive EθE^\theta value

Formula for EcellθE^\theta_{\text{cell}}

Ereductionθ−EoxidationθE^\theta_{\text{reduction}} - E^\theta_{\text{oxidation}}

Effect of increasing Cu2+\text{Cu}^{2+} conc. on EMF

Increases EMF

Effect of increasing Zn2+\text{Zn}^{2+} conc. on EMF

Decreases EMF

Effect of higher temp. on exothermic cell EMF

Decreases EMF

Principle explaining temp. effects on EMF

Le Chatelier's principle

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Thermodynamics (A Level only)

Rate Equations (A Level only)

Equilibrium constant (Kp) for Homogeneous Systems (A Level only)

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