Redox / Electrochemical cells Summary

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What is a redox reaction?
A reaction where reduction and oxidation occur simultaneously.
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How are electrochemical cells made?
By dipping two different metals in salt solutions of their own ions and connecting them by a wire and a salt bridge.
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What is the salt bridge made from?
Paper soaked in potassium nitrate (KNO3).
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Which direction does the reaction with the more negative electrode potential go?
In the direction of oxidation / backwards.
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Which direction does the reaction with the more positive electrode potential go?
In the direction of reduction / forwards.
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What is the equation to calculate standard cell potential?
E cell = E right - E left
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What factors can influence the cell potential?
Temperature, pressure and concentration.
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What are the main features of a standard hydrogen electrode?
Hydrogen gas bubbled into a solution of aqueous H+ ions. Platinum is used as the electrode.
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Why is platinum a suitable electrode?
Inert and conducts electricity.
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What are batteries?
Electrochemical cells.
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What is the main difference between the reactions that occur in non-rechargeable batteries and rechargeable batteries?
Non-rechargeable: non-reversible reactions. Rechargeable: reversible reactions.
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What electrode is H2 fed into in a hydrogen-oxygen fuel cell?
Negative electrode.
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What electrode is the O2 fed into in a hydrogen-oxygen fuel cell?
Positive electrode.
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What type of membrane separates the electrodes and what does it do?
Ion-exchange membrane. Allows H+ ions to pass through it, but not electrons.
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What product is formed from a hydrogen-oxygen fuel cell?
Water
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Other cards in this set

Card 2

Front

How are electrochemical cells made?

Back

By dipping two different metals in salt solutions of their own ions and connecting them by a wire and a salt bridge.

Card 3

Front

What is the salt bridge made from?

Back

Preview of the front of card 3

Card 4

Front

Which direction does the reaction with the more negative electrode potential go?

Back

Preview of the front of card 4

Card 5

Front

Which direction does the reaction with the more positive electrode potential go?

Back

Preview of the front of card 5
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