Lecture 3 Electrode Potentials Flashcards

1
Q

what is the driving force for electrochemical reactions

A

cell potential

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2
Q

equation for potential difference of a full cell

A

Ecell = Ecathode - Eanode

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3
Q

what is electromotive force

A

maximum potential generated by a cell

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4
Q

what is standard cell potential

A

maximum potential generated by a cell

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5
Q

what total activities of reactants and products means a cell is working at maximum potential

A

1

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6
Q

what do you use to measure potential

A

voltmeter

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7
Q

how can you measure the absolute values of half-cell potentials

A

you can’t

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8
Q

how to find the potential of a half-cell

A

defne a standard potential

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9
Q

what is potential of standard hydrogen electrode

A

0.0V

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10
Q

standard conditions of SHE

A

1 bar

1 moldm^-3 of H+ concentration

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11
Q

what generally has positive half-cell potential

A

good oxidising agnets

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12
Q

what are reactions that define electrode potentials written as

A

reduction
E circle with horizontal line through in superscript
oxidised form/reduced form in subscript

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13
Q

where do good oxidising agents lie on the table

A

above SHE

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14
Q

where do good reducing agents lie on the SHE

A

below SHE

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15
Q

what generally has negative half cell potential

A

good reducing agents

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16
Q

which half reaction is more likely to occur in the positive direction

A

high positive cell potential - reduction

17
Q

when is a reaction spontaneous

A

when the sign of the cell potential is positive