A voltaic cell can be made by connecting together 2 different half cells, this allows electron transfer.
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Why must you keep chemicals in each half cell separate?
Otherwise electrons would flow in uncontrolled way, heat energy would be released instead.
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What is formed at the tip of the metal where it's in contact with its ions?
Equilibrium
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What determines the direction of electrons in two hald cells?
The relative tendency of each atom to accept electrons.
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What is used is ion/ion half cell as metal to support electrons?
Platinum as it is inert
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What is standard electrode potential?
The e.m.f of a half cell connected to a standard hydrogen half cell under standard conditions of 298k, 1moldm-3, 100kPa
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The more negative the standard electrode potential....
the greater the tendency to lose electrons and undergo oxidation. The less the tendency to gain electrons and undergo reduction
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How to calculate Standard electrode potential of a cell?
More positive - more negative
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What are primary cells?
Non rechargeable. Electrical energy is produced by reduction and oxidation, cannot be reversed.
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Secondary?
Rechargeable, oxidation and reduction can be reversed
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What does the salt bridge do?
Allow flow of ions
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Limitations of standard electrode values?
Large activation energies can result in very slow reactions.
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Descrive a fuel cell
Energy from the reaction of a fuel with oxygen. Fuel and oxygen flow into the fuel cell and the products flow out, electrolyte remains in the cell. Fuel cells can operate continuously, no recharging, no CO2
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Other cards in this set
Card 2
Front
Why must you keep chemicals in each half cell separate?
Back
Otherwise electrons would flow in uncontrolled way, heat energy would be released instead.
Card 3
Front
What is formed at the tip of the metal where it's in contact with its ions?
Back
Card 4
Front
What determines the direction of electrons in two hald cells?
Back
Card 5
Front
What is used is ion/ion half cell as metal to support electrons?
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