2. Redox

Question 1

what is oxidation

Answer 1

loss of e-

Question 2

what happens to the oxidation #/state when oxidation happens

Answer 2

increases

Question 3

what does an oxidant cause

Answer 3

oxidation

Question 4

what happens to an oxidising agent

Answer 4

it gets reduced

Question 5

what happens in reduction

Answer 5

gain e-

Question 6

what happens to the oxidation #/state in reduction

Answer 6

decreases

Question 7

what does a reductant cause

Answer 7

reduction

Question 8

what happens to the reducing agent

Answer 8

gets oxidised

Question 9

what is the oxidation # of elements

Answer 9

0

Question 10

what is the oxidation # of atom in monoatomic ion

Answer 10

charge on ion

Question 11

what is the oxidation # of O2 in compound

Answer 11

-2

Question 12

what is the oxidation # of O2 in peroxides

Answer 12

-1

Question 13

what is the oxidation # of H in compound

Answer 13

+1

Question 14

what is the oxidation # of H in metal hydrides

Answer 14

-1

Question 15

what is the sum of oxidation # of atoms in a molecule

Answer 15

0

Question 16

what is the sum of oxidation # of atoms in a polyatomic ion

Answer 16

charge on ion

Question 17

how to balance equations

Answer 17

add H20 to balance Os

add H+ to balance Hs

add e- to balance charge

Question 18

what is an electrode

Answer 18

electricity conductor

reactions occur on their surface

Question 19

what is an anode - what occurs here

Answer 19

oxidation occur at this electrode

Question 20

what is a cathode - what occurs here

Answer 20

reduction occur at this electrode

Question 21

what are anions and where do they move towards

Answer 21

-

move towards anode

Question 22

what are cation and where do they move towards

Answer 22

+

move towards cathode

Question 23

how does a galvanic electrochemical cell work

Answer 23

2 half cells connected via

int circuit = ions through electrolyte to maintain charge

ext circuit = e- move through wire between electrodes

causes electric current to flow via 2 different metals resulting in e- transfer

Question 24

how does an electrolytic cell work

Answer 24

electrolysis where power supply forces oxidation and reduction via e- movement in ext circuit

electrolyte allows ion movement = int circuit

Question 25

if the standard reduction potential is further up what does this mean

Answer 25

more easily reduced

stronger oxidant

Question 26

if the overall E* is + what does this mean

Answer 26

spontaneous

Question 27

when calculating E* cells for oxidated species what must you do

Answer 27

flip + and negative signs for oxidised species