Redox and Electrode Potentials (OCR A-Level Chemistry A): Flashcards

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Predictions from electrode potentials
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What standard electrode potentials (E∘E^{\circ}) predict

Thermodynamic feasibility of redox reactions

Standard conditions for E∘E^{\circ} measurements

11 mol dm−3^{-3}, 298298 K, 100100 kPa

Systems with more negative E∘E^{\circ} act as

Stronger reducing agents

Systems with more positive E∘E^{\circ} act as

Stronger oxidising agents

Location of strongest oxidising agent in series

Bottom left (most positive E∘E^{\circ})

Location of strongest reducing agent in series

Top right (most negative E∘E^{\circ})

For feasible reaction, oxidising agent from system with

More positive E∘E^{\circ} than reducing agent system

Limitation: E∘E^{\circ} gives no info about

Reaction rate/kinetics

Why concentration affects E∘E^{\circ} predictions

E∘E^{\circ} at 11 mol dm−3^{-3}; real reactions may differ

Equation linking Ecell∘E^{\circ}_{cell} and ΔG∘\Delta G^{\circ}

ΔG∘=−nFEcell∘\Delta G^{\circ} = -nFE^{\circ}_{cell}

Explore OCR A-Level Chemistry A Revision Notes by Topics

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Rates of Reactions

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Acids, Bases and pH

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Enthalpy and Entropy

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Explore OCR A-Level Chemistry A Quizzes by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Exam Questions by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

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