Electrochemistry

Question 1

oxidation

Answer 1

loss of electrons

Question 2

reduction

Answer 2

gain of electrons

Question 3

what agent is the oxidized atom

Answer 3

reducing agent

Question 4

what agent is the reduced atom

Answer 4

oxidizing agent

Question 5

what happens at anode

Answer 5

oxidation

Question 6

what happens at cathode

Answer 6

reduction

Question 7

galvanic cell function

Answer 7

flow of electrons create an electric current that can do work in a redox reaction. spontaneous redox reactions generate electric currents

Question 8

anode

Answer 8

electron source

Question 9

cathode

Answer 9

electron sink

Question 10

how do electrons flow in galvanic cell

Answer 10

anode to cathode

Question 11

salt bridge anion and cation destinations

Answer 11

anion goes to anode, cation goes to cathode

Question 12

what do salt bridges complete

Answer 12

circuit

Question 13

what are the standard conditions

Answer 13

25 degrees celcius, 1 atm, 1 M

Question 14

what is free energy change for a redox reaction?

Answer 14

delta G = -nFE

Question 15

What must cell voltage and free energy be to be spontaneous

Answer 15

cell voltage positive, free energy negative

Question 16

If a reduction potential is negative, what are characteristics of reactant

Answer 16

better as a reducing agent, weak oxidizing agent

Question 17

if a reduction potential is positive, what are characteristics of reactant

Answer 17

stronger as an oxidizing agent and weaker as a reducing agent

Question 18

What are nonstandard conditions

Answer 18

when solution does not equal 1 M and nernst equation must be used

Question 19

concentration cell

Answer 19

galvanic cell with identical electrodes but has half cells with different ion concentrations

Question 20

what is anode in concentration cell

Answer 20

lower concentration solution

Question 21

what is cathode in concentration cell

Answer 21

higher concentration solution

Question 22

when does reaction stop in concentration cell

Answer 22

when concentrations are equal

Question 23

what is standard cell voltage in concentration cell

Answer 23

zero, since ions in two beakers have same identities

Question 24

redox indicator

Answer 24

uses change in color to determine endpoint. change is due to change in oxidation state

Question 25

what makes a redox indicator an ideal indicator

Answer 25

having a high redox potential for determination of solution with oxidizable species

Question 26

At half equivalence point

Answer 26

oxidized and non oxidized are equal and Q = 1. E= E prime

Question 27

Electrolytic Cells

Answer 27

Use external voltage (battery) to create electric current that forces nonspontaneous reactions to occur.

Question 28

Electrolysis

Answer 28

use of electrolytic cells

Question 29

Electroplating

Answer 29

electrolytic cells are used for plating thin layer of metal on top of another material

Question 30

Anode in electrolytic cells charge

Answer 30

positive, because electrons are forced to move

Question 31

Cathode in electrolytic cells charge

Answer 31

negative, because electrons are forced to move

Question 32

Faraday’s Law of electrolysis

Answer 32

amount of chemical charge is proportional to amount of electricity that flows through cell

Question 33

Faraday

Answer 33

magnitude of charge on 1 mole of electrons