ELECTROCHEMISTRY Flashcards
1
Q
OIL
A
Oxidation is LOSS of electrons
2
Q
RIG
A
Reduction is GAIN of electrons
3
Q
How do you know which is oxidized, reduced, oxidizing agent, reducing agent
A
One that is being oxidized will be a reducing agent, and one that is being reduced will be an oxidizing agent
4
Q
Oxidation state rules (10)
A
- Element by itself: 0
- Group 1A: always +1
- Group 2A: always +2
- Halogens: usually -1 but +1 with oxygen
- Monoatomic ions: ion charge
- H: +1 with nonmetal, -1 with metal
- O: usually -2 but -1 in H2O2
- F: Always -1
- Sum of oxidation numbers for a neutral compound: 0
- Sum of oxidation number for polyatomic ion = ion charge
5
Q
E°cell formula
A
E°cell = E°cathode - E°anode
6
Q
Mass formula
A
A (current) x T (seconds) x molar mass/F x ne (moles of electron)
7
Q
Galvanic (voltanic cell) (3)
A
- Converts chemical energy to electrical energy
- 1/2 reaction occurs in separate electrode
- Oxidation: anode
Reduction: cathode
8
Q
Electrolytic cell (3)
A
- Converts electrical energy to chemical energy
- Anode on + terminal battery
- Cathode on - terminal battery
9
Q
Which equation is longer, oxidation or reduction
A
Oxidation is shorter, reduction is longer
10
Q
Galvanic cell notation
A
Anode (left) then cathode (right)
11
Q
Single line
A
Separates 2 phases within cell
12
Q
Double line
A
Separates each end of salt bridge
13
Q
Pt(s)
A
Solid is present
