Electrochemistry Flashcards

1
Q

Oxidation number of hydrogen in most compounds

A

+1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Oxidation number of oxygen in most compounds

A

-2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Oxidation number of fluorine in any compound

A

-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Elemental species have an oxidation number of

A

0.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Elemental ions have oxidation numbers

A

equal to their charge.

Ex. In Fe3+, iron has an oxidation number of +3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

All oxidation numbers of each individual atom in a compound must add up to

A

the charge on the compound.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Group 1A metals oxidation state in all compounds

A

+1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Group 2A metals oxidation state in all compounds

A

+2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Meaning of LEO says GER

A

Loss
Electrons
Oxidized

Gain
Electrons
Reduced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Oxidation always occurs at the

A

anode. (Red cat / an ox)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Reduction always occurs at the

A

cathode. (Red cat / an ox)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Electrons flow in what direction in an electrochemical cell?

A

Anode to cathode (FAT Cat)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which electrode is sometimes found to lose mass in an electrochemical cell?

A

Anode (FAT Cat)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Which electrode can have matter accumulate at the electrode?

A

Cathode (FAT Cat)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Cations travel through the salt bridge to which half-cell?

A

Cathodic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Anions travel through the salt bridge to which half-cell?

17
Q

How does the salt bridge complete the circuit in an electrochemical cell?

A

Ions travel through salt bridge

Note: Electrons do NOT freely travel through the salt bridge.

18
Q

When you reverse a reaction, what do you do to E°?

A

Change the sign (pos to neg or neg to pos)

19
Q

When you change the coefficients of a reaction, what happens to E°?

20
Q

Formula for E°cell from half-reaction potentials

A

E°cell = E°red + E°ox

21
Q

When adding half-reactions, what has to happen?

A

Electrons must cancel out

22
Q

For a galvanic/voltaic cell, the half-reaction with the more positive E*°red will occur at the

23
Q

For a galvanic/voltaic cell, the E*°cell must be

24
Q

When calculating ΔG°rxn from E°cell or vise-versa, ΔG*°rxn must be in

25
When calculating Δ*G*°rxn from E*°cell or vise-versa, n is the
moles of electrons transferred per mole of rxn.
26
What is considered to be standard conditions?
Gases at 1 atm partial pressure Concentrations at 1 *M* Temperature at 298 Kelvin
27
At non-standard conditions, if *Q* is ______ than one, *E* is less than *E*°.
Greater
28
At non-standard conditions, if *Q* is less than one, *E* is _______ than *E*°.
Greater (more reactants, so more charged)
29
As *Q* approach *K* for a galvanic/voltaic cell, what happens to the voltage?
The voltage approach zero Equilibrium is where batteries go to die!
30
*K* for galvanic/voltaic cells reactions is usually
a huge number (very product favored and goes to completion).