9.2 Electrochemical cells

Question 1

what is a voltaic cell composed of?

Answer 1

two half cells connected via an external wire and a salt bridge

Question 2

what is the role of the salt bridge in a voltaic cell?

Answer 2

an ionic material (often potassium nitrate soaked cloth) that balances charges between half cells

Question 3

what reaction occurs at the anode in a voltaic cell?

Answer 3

oxidation

Question 4

what reaction occurs at the cathode in a voltaic cell?

Answer 4

reduction

Question 5

what is the mnemonic to remember the processes at electrodes in a voltaic cell?

Answer 5

An Ox Red Cat
Anode oxidation
Reduction Cathode

Question 6

how does the current flow within a cell?

Answer 6

from the anode to the cathode

Question 7

what is the positive electrode in a voltaic cell?

Answer 7

cathode

Question 8

what is the negative electrode in a voltaic cell?

Answer 8

anode

Question 9

what type of electrodes does an electrolytic cell typically contain?

Answer 9

innert platinum or graphite electrodes

Question 10

what reaction occurs at the anode in an electrolytic cell

Answer 10

oxidation

Question 11

what reaction occurs at the cathode in an electrolytic cell

Answer 11

reduction

Question 12

what is the positive electrode in an electrolytic cell?

Answer 12

anode

Question 13

what is the negative electrode in an electrolytic cell?

Answer 13

cathode

Question 14

what is the notation of a Mg and Cu voltaic cell?

Answer 14

Mg(s)|Mg2+(aq)||Cu2+(aq)|Cu(s)

Question 15

what is produced in a molten electrolytic cell?

Answer 15

metal ions form metal at the cathode and non-metal form at the anode

Question 16

what is produced at the cathode in an aqueous electrolytic cell?

Answer 16

if the flipped electrode potential of the non-metal ion is <1.23V, oxygen gas will form
otherwise, the non-metal forms

Question 17

what is produced at the anode in an aqueous electrolytic cell?

Answer 17

If the electrode potential of the metal ions i <-0.83V, hydrogen gas will form
otherwise, the metal forms