Lecture 3 Electrode Potentials

Question 1

what is the driving force for electrochemical reactions

Answer 1

cell potential

Question 2

equation for potential difference of a full cell

Answer 2

Ecell = Ecathode - Eanode

Question 3

what is electromotive force

Answer 3

maximum potential generated by a cell

Question 4

what is standard cell potential

Answer 4

maximum potential generated by a cell

Question 5

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

Answer 5

1

Question 6

what do you use to measure potential

Answer 6

voltmeter

Question 7

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

Answer 7

you can’t

Question 8

how to find the potential of a half-cell

Answer 8

defne a standard potential

Question 9

what is potential of standard hydrogen electrode

Answer 9

0.0V

Question 10

standard conditions of SHE

Answer 10

1 bar

1 moldm^-3 of H+ concentration

Question 11

what generally has positive half-cell potential

Answer 11

good oxidising agnets

Question 12

what are reactions that define electrode potentials written as

Answer 12

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

Question 13

where do good oxidising agents lie on the table

Answer 13

above SHE

Question 14

where do good reducing agents lie on the SHE

Answer 14

below SHE

Question 15

what generally has negative half cell potential

Answer 15

good reducing agents

Question 16

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

Answer 16

high positive cell potential - reduction

Question 17

when is a reaction spontaneous

Answer 17

when the sign of the cell potential is positive