Electrochemistry

Question 1

Electrochemical reactions are spontaneous reactions that

Answer 1

Produce electrical energy and nonspontaneous reactions that use electrical energy to produce chemical change

Question 2

What do electrochemical reactions involve?

Answer 2

The transfer electrons via redox reactions

Question 3

Electrochemical cells contain systems in which

Answer 3

Redox reactions occur

Question 4

What are two types of Electrochemical cells?

Answer 4

• Galvanic / Voltaic

- Electrolytic cells

Question 5

Galvanic / Voltaic cells have what kind of reactions?

Answer 5

Spontaneous

Question 6

Electrolytic cells have what kind of reactions?

Answer 6

Nonspontaneous

Question 7

Where do redox reactions occur in electrochemical cells?

Answer 7

In electrodes, which act as electrical conductors

Question 8

What are the two electrodes found?

Answer 8

• Anodes

- Cathodes

Question 9

Anodes are electrodes in which

Answer 9

Oxidation occurs

Question 10

Cathodes are electrodes in which

Answer 10

Reduction occurs

Question 11

How is ∆G in Galvanic Cells?

Answer 11

-∆G, making them spontaneous

Question 12

How is the Ecell of Galvanic Cells?

Answer 12

+ Ecell

Question 13

How are Galvanic Cells?

Answer 13

They supply energy that is harnessed by placing redox half-rxns in half cells connected by apparatus

Question 14

What is the purpose of the apparatus in Galvanic Cells?

Answer 14

It allows for the flow of electrons between half-cells, creating a circuit

Question 15

How do electrons flow?

Answer 15

From the anode to the cathode

Question 16

What is the purpose of the salt bridge in Galvanic Cells?

Answer 16

Prevents charge buildup

Question 17

How do salt bridges prevent charge buildup in Galvanic Cells?

Answer 17

They contain inert electrolytes

Question 18

How is ∆G in Electrolytic Cells?

Answer 18

+∆G, making them nonspontaneous

Question 19

How is the Ecell of Galvanic Cells?

Answer 19

• Ecell

Question 20

Electrophoresis is a technique used to separate

Answer 20

AAs based on isoelectric pts

Question 21

In electrophoresis, cations navigate towards the

Answer 21

Cathode

Question 22

In electrophoresis, anions navigate towards the

Answer 22

Anode

Question 23

Quantitative electrochemistry explains the

Answer 23

Number of moles exchanged within a balanced reaction

Question 24

What is the charge of an electron?

Answer 24

1.6E-19

Question 25

1 mol of an electron has the change of?

Answer 25

1 F, or 10E5

Question 26

What is the equation used to determine the number of electrons transferred?

Answer 26

i • t = n • F

Question 27

The reduction potential determines which species is

Answer 27

Oxidized or reduced

Question 28

The more positive the reduction potential is the

Answer 28

Greater the reduction

Question 29

Reduction potential is measured in

Answer 29

Volts

Question 30

What is the Standard Reduction Potential (Eº)?

Answer 30

The Standard Reduction Potential (Eº) measured under standard conditions

Question 31

The higher the Eº is, the

Answer 31

Greater the tendency for reduction

Question 32

The lower the Eº is, the

Answer 32

Greater the tendency for oxidation

Question 33

What is the emf of a cell?

Answer 33

It is the difference in potential between 2 half-cells

Question 34

What is the equation of emf/Eºcell?

Answer 34

Eºcell = Eºred + Eºoxid

Question 35

What are the equations of Gibbs Free Energy?

Answer 35

∆G = -nFEcell
∆G = -RTlnKeq

Question 36

What is the Nernst Equation?

Answer 36

Ecell = Eºcell - (RT/nF)(lnQ)