Redox and Electrode Potentials

Question 1

What is the half equation at the anode

Answer 1

H2 -> 2H+ + 2e-

Question 2

What is the adv. of electrochemical cells

Answer 2

Greater efficency
Reduced emissions
Clean by products

Question 3

What is the disadv. of electrochemical cells

Answer 3

Toxic materials
Flammabilty Risks

Question 4

What is reaction of MnO4

Answer 4

MnO4- + 8H+ + 5fe2+ -> Mn2+ + 4H2O + 5Fe3+

Question 5

What are limitations for using Electrochemical cell for predictions

Answer 5

1. Non standard conditions -> Deviations from S.C affect electrode potential + feasability
2. Unfavourable reaction kinetics
3. Non aqueous conditions -> Not accurately predict feasability reactions in non aqueous conditions

Question 6

What is the definition of standard electrode potential

Answer 6

Electromotive force of a cell compared with a hydrogen half cell

Question 7

What is oxidising agent and reducing agent

Answer 7

Oxidising agent gains e- and reducing agent loses e-

Question 8

State one difference between a fuel cell and modern storage cell

Answer 8

Fuel cells react with oxygen to give electrical energy

Question 9

State one advantage of using ethanol rather than hydrogen ina fuel cell for veichles

Answer 9

Ethanol is less volatile and easire to store