EMF s

Question 1

Reaction at positive electrode of lithium cell

Answer 1

Li+ + CoO2 + e- > Li+[CoO2]-

Question 2

Reaction at negative electrode of lithium cell

Answer 2

Li > Li+ + e-

Question 3

Reaction at negative electrode in hydrogen fuel cell

Answer 3

H2 + 2OH- > 2H2O +2e-

Question 4

Reaction at positive electrode in hydrogen fuel cell

Answer 4

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

Question 5

Calculate EMF

Answer 5

RED-OX
RIGHT-LEFT

Question 6

Which EMF is the one being oxidised

Answer 6

More negative

Question 7

What must EMF be for the cell to e ‘good’

Answer 7

positive value

Question 8

Explain the function of a salt bridge

Answer 8

Allow aqueous ions to flow to complete the circuit

Question 9

Advanatge of using fuel cell over combustible fuels

Question 10

Explain how to write standard notation of fuel cells

Answer 10

Negative half cell goes on the left of the double line

R|O||O|R

Question 11

When is a Pt electrode required and why

Answer 11

When both forms of the metal are aqueous; to conduct electrons