Electrode Potentials

Question 1

What is an electrochemical cell

Answer 1

A cell that converts chemical energy into electrical energy through redox reactions

Question 2

How do you make an electrochemical cell

Answer 2

Put 2 half cells containing an electrode and an ionic solution together with a salt bridge and an external circuit

Question 3

How are salt bridges usually formed

Answer 3

Filter paper soaked in a neutral electrolyte

Question 4

Which electrode does oxidation occur at

Answer 4

Anode

Question 5

Which electrode does reduction occur at

Answer 5

Cathode

Question 6

Which direction do electrons move in a cell

Answer 6

From anode to cathode

Question 7

How do you work out cell potential

Answer 7

E of the cell = E of RHS - E of LHS

Question 8

Is the LHS more positive or negative

Answer 8

Always the more negative side unless using the standard Hydrogen electrode

Question 9

What is the standard Hydrogen electrode

Answer 9

Half cell made up of a platinum electrode. 1.00 moldm-3 H2+ solution at 298K and 100kPa. It’s electrode potential is always 0.

Question 10

How to tell if a reaction is feasible using electrode potentials

Answer 10

Work out Electrode potential of the cell. If it’s positive it’s possible at standard conditions.

Question 11

What equation occurs at the anode of a lithium battery

Answer 11

CoO2 + Li+ +e- = LiCoO2

Question 12

What equation occurs at the cathode of a lithium battery

Answer 12

Li+ +e- = Li

Question 13

What equation happens at the anode of a Hydrogen fule cell

Answer 13

2H2 + 4OH- = 4H2O + 4e-

Question 14

What equation happens at the cathode of a Hydrogen fule cell

Answer 14

O2 + 2H2O + 4e- = 4OH-