Ch 18 Electrochemistry Flashcards
1
Q
Oxidation
A
Increases oxi #
loses e-s
2
Q
Oxidation numbers…
A
Add up to overall charge
3
Q
Groups 1,2,3 have what oxi number
A
+1, +2, +3 usually
4
Q
F is what oxidation number
A
-1
5
Q
Cl, Br, and I are what oxi number
A
Usually -1. Except with O or F (then those overrate)
6
Q
H is usually what oxi number
A
+1 except with a metal. Then H is -1
7
Q
O is what oxidation number usually
A
-2 except with F where F dominates and Peroxides (-1)
8
Q
Balancing redox reactions
A
- Identify oxi and reduction
- Perform material balance(except H and O)
- balance O using H2O
- balance H using H+
- balance Charge
- equalize Electrons
- Add half rxns
9
Q
Balancing redox rxns in basic soln
A
- Same as acid except when you add H+ to balance H
You add equal number of OH- to both sides - H+ + OH- = H2O
10
Q
Anode
A
Oxidation ( first part in cell diagram)
11
Q
Cathode
A
Reduction (last part in cell diagram)
12
Q
Voltaic / galvanic cell
A
G
13
Q
Electrolytic cell
A
G>0
E
14
Q
Spontaneous
A
E>0
G
15
Q
Equilibrium
A
Ecell=0
Q=K
