Redox

Question 1

Voltaic cell converts ___ to _____

Answer 1

Chemical energy to electrical energy

Question 2

What happens when electrolytes dissolve in water

Answer 2

They conduct electrical current

Question 3

Electrolytic cells covert ___ to _____

Answer 3

Electrical energy to chemical energy

Question 4

Electrodes=

Answer 4

Conductors that carry electrons in and out of the cell

Question 5

Formula for voltage of the cell

Answer 5

Electrical potential of cell= EP cathode - EP anode

Question 6

Anode is oxidized therefore it becomes ____

Answer 6

Smaller

Question 7

Cathode is reduced therefore it ____

Answer 7

Gains mass

Question 8

Anions go to the ____ and cations go to the ____

Answer 8

Anode
cathode

Question 9

If the EPcell is > 0 the rxn is ___

Answer 9

Spontaneous

Question 10

If EPcell < 0 the rxn is ____

Answer 10

Non spontaneous

Question 11

Anode has a __ charge ad cathode has a ___ charge

Answer 11

• +

Question 12

If cl2 is present what colour does litmus paper turn

Answer 12

White

Question 13

Primary batteries=

Answer 13

Runs until it runs out then you throw it away

Question 14

Secondary batteries s=

Answer 14

rechargeable batteries

Question 15

Fuel cells=

Answer 15

Voltaic cells that can be refueled by adding fuel 1st

Question 16

4 ways to prevent corrosion

Answer 16

1) paint or other coatings
2) forming an alloy
3) galvanizing
4) cathodic protection

Question 17

What’s involved in forming an alloy

Answer 17

Mix iron with more resistant metals in an alloy so they’re bale to resist environmental stresses better

Question 18

What is galvanizing

Answer 18

Iron is coated with a protective layer of zinc so they’re bale zinc corrodes instead of the iron (acts as a barrier) (zinc is a sacrificial anode)

Question 19

Differences in electrolytic vs. Voltaic cells

Answer 19

• DC power source not volt meter
• voltage should be negative indicating on spontaneous RXN
• anode is + cathode is -
• EP cell= (-)

Question 20

2 components involved in cathodic protection

Answer 20

Sacrificial anode
Impressed current

Question 21

What is the method of sacrificial anode

Answer 21

A more reactive metal is attached to the iron therefore that is corroded first (needs replacing occasionally)

Question 22

What is impressed current

Answer 22

Trickles electrons through a DC power source onto the metal to protect it

Question 23

In the electrolysis of molten what species isn’t present

Answer 23

H20

Question 24

What is the chlorine anomoly

Answer 24

If both chlorine and h20 can be oxidized, chlorine will be oxidized first despite the reduction table

Question 25

What is electroplating

Answer 25

The process of coating an object with a thin layer of metal like silver, gold, etc

Question 26

In electroplating what is the charge opposite to

Answer 26

Voltaic cells

Question 27

What’s faradays law

Answer 27

The amount of substance produced or consumed in an electrolyitic cell is related to the quantity of electricity applied in the cell

Question 28

1 coulomb = ____

Answer 28

6.24 x10^18 e-

Question 29

What unit is electrical current in and what about electrical charge

Answer 29

Amperes Coulombs