Day 7: Electrochemistry

Question 1

Oxidation

Answer 1

Loss of electrons (LEO)

Question 2

Reduction

Answer 2

Gain of electrion (GER)

Question 3

States of oxidation: 1

Answer 3

Elements in their elemental form are in the zero oxidation state (i.e. O2/O3)

Question 4

States of oxidation: 2

Answer 4

Group 1 metals are +1 and Group 2 metals are +2

Question 5

States of oxidation: 3

Answer 5

Hydrogen is +1 except when bonded to metals (when it’s -1)

Question 6

States of oxidation: 4

Answer 6

Transition elements must be determined by context (except Al = +3, Zn= +2, Cd=+2, Ag= +1)

Question 7

States of oxidation: 5

Answer 7

The most electronegative elements get their typical oxidation state

Question 8

States of oxidation: 6

Answer 8

The last element not assigned balances the charge of the compound/ion

Question 9

Oxidizing agent gets ________________ and reducing agent gets ______________

Answer 9

Reduced/ Oxidized

Question 10

Elements or compounds are

Answer 10

oxidized/reduced

Question 11

Compounds only

Answer 11

act as reducing/oxidizing agents

Question 12

The anode is always

Answer 12

the site of oxidation (an Ox)

Question 13

The cathode is always

Answer 13

the site of reduction (red cat)

Question 14

Electrons always flow from

Answer 14

anode to cathode

Question 15

Anions flow to the _______ and cations to the _____ through a salt bridge

Answer 15

Anode/Cathode

Question 16

In the galvanic/voltaic (spontaneous) cells (Ecell>0)

Answer 16

the cathode is (+) and the anode is (-)

Question 17

In electrolytic (non-spontaneous) cells (Ecell

Answer 17

cathode is (-) and anode is (+)

Question 18

For metal/metal salt solution cells the cathode ________ and the anode ______

Answer 18

Gains mass/ Loses Mass

Question 19

Galvanic cells _____ electricity

Answer 19

produce

Question 20

Electrolytic cells______ electricity

Answer 20

consume, electricity forces non-spontaneous reaction to occur

Question 21

Salt bridge

Answer 21

Completes curcuit, flow keeps solution netural

Question 22

Flow is always from the

Answer 22

Anode to cathode

Question 23

Standard Cell potentials

Answer 23

E(o) cell = E(o) reduction + E(o) oxidation

Question 24

Standard Hydrogen Electrode (SHE) has a potential of

Answer 24

0.00V

Question 25

Non-standard cell potentials

Answer 25

E= E - (0.0592/n)*logQ; n=electrons transfered

Question 26

Shift to the right

Answer 26

higher potential

Question 27

Shift to the left

Answer 27

lower potential

Question 28

Spontaneous Rxns

Answer 28

ΔG0

Q

Question 29

@ eq. Ecell is equal to

Answer 29

Zero

Question 30

Feredays constant

Answer 30

1 mol e- =96500C

Question 31

Quantative Calc: G product

Answer 31

(amps)(Ts)(MW)/ (n)(F)

Question 32

Quantative Calc: mol product

All teachers never fail me

Answer 32

(amps)(Ts)/(n)(F)