Electrochemistry

Question 1

What is the standard reduction potential?

Answer 1

E °
measured in V
used to refer to any reduction half reaction

Question 2

is standard reduction potential E ° is more Positive

Answer 2

Proceed in reduction direction

Question 3

is standard reduction potential E ° is more negative

Answer 3

Proceed in the Oxidation direction

Question 4

What is an electrochemical cell?

Answer 4

device set up to use a redox reaction

anode - site of oxidation

cathode - site of reduction

Question 5

What is a galvanic cell?

Answer 5

Spontaneous redox reduction is used to generate a positive potential difference that drives a current

E ° must be positive

Question 6

How to find the reaction direction in a galvanic cell?

Answer 6

E ° cell = E ° cathode - E ° anode

Question 7

What is a Daniell cell?

Answer 7

salt bridge

spectator ions countercurrent the charge imbalance that would occur from the reaction

Question 8

in a Galvanic cell anode is what cathode is what?

Answer 8

Anode is (-)
Cathode (+)

Question 9

in an electrolytic cell, anode is what cathode is what?

Answer 9

Anode (+)
cathode (-)

non- Spontaneous

Question 10

what direction do electrons flow?

Answer 10

always from anode to cathode

Question 11

what deos an electrolytic cell do?

Answer 11

used to drive nonspontaneous redox reactions

associated with a negative E °

Question 12

what is electroplating?

Answer 12

nonspontaneous reduction of metal ions in solution

results in deposition of solid metal onto cathode

Question 13

5 points on Galvanic cell

Answer 13

always spontaneous

positive E °

negative anode / positive cathode

release energy

electrons flow from anode to cathode

Question 14

5 points on an electrolytic cells

Answer 14

always nonspontaneous

negative E °

positive anode / negative cathode

require energy input

electrons flow from anode to cathode