Electrochemistry

Question 1

Which electrode is the negative electrode (in relation to electron flow)?

Answer 1

Electrons flow from the negative electrode or ‘anode’.

Question 2

Is the cathode the negative or positive electrode?

Answer 2

Positive

Question 3

Oxidation occurs at which electrode?

Answer 3

Anode

Question 4

What happens to the reduction potential when you reverse a half reaction

Answer 4

The value stays the same but the sign is reversed.

Question 5

How does the amount of moles affect the E⁰ of a cell?

Answer 5

It has no effect.

Question 6

What does a positive standard reduction potential mean?

Answer 6

The higher the value the more likely the substance is to be reduced andbe a stronger oxidizing agent.

Question 7

An oxidizing agent can oxidase any reducing agent that lies below it on a standard reduction table. Which side is each agent.

Answer 7

LHS RHS

Oxisising agent Reducing agent

Question 8

ΔG = -nFξ What are they and what units?

Answer 8

ΔG is change in free energy (Joules)
n is number of moles ( mol)
F is Faradays constant (coloumbs mol⁻¹)
ξ is cell voltage (V)

Question 9

Numonic for electronegative atome

Answer 9

BrSN ClOF

NOF
S Cl
Br