20. ELECTROCHEMISTRY Flashcards
1
Q
What is discharged at the electrodes
A
- at cathode, metal with highest E*
- at anode, anion with lowest E* expect halogens which will ALWAYS be discharged. F->Cl->Br->I (overpotential)
2
Q
How to write an ionic equation
A
- more positive E* will be reduction
- more negative E* will be oxidation
- balance the electrons
3
Q
Which species is an oxidising agent
A
species with most positive E*
4
Q
Which species is a reducing agent
A
species with most negative E*
5
Q
How to figure out if a reaction occurs
A
- if one of the two given species can be oxidised and the other reduced, reaction occurs
- equation written with the species swapped according to whether oxidation/reduction taking place
- equation balanced
6
Q
What are formulae for calculating avogadro constant
A
L = number of moles of electrons/number of electrons
L = total charge of electrons(Faraday Constant)/charge on one electron
7
Q
What is the conversion from cm^3 to dm^3
A
x10^-3
8
Q
What colour is FeSO4
A
pale green
