Chapter 5 - Galvanic Cells as a Source of Energy

Question 1

electrochemical cell

Answer 1

device in which chemical energy is converted into electrochemical energy or vice versa

Question 2

galvanic cell

Answer 2

type of electrochemical cell in which chemical energy is converted into chemical energy

Question 3

battery

Answer 3

the combination of several cells in a series

Question 4

features of a galvanic cell

Answer 4

• chemical energy converted directly into electrical energy via a redox reaction
• salt bridge
• spontaneous and exothermic
• two half cells
• electron transfer between external circuit

Question 5

salt bridge

Answer 5

contain ions that are free to move so they balance charges
cations move towards cathode and anions move towards anode
prevents accumulation of charge

Question 6

galvanic: anode

Answer 6

electrode at which oxidation occurs; negative terminal; electrons released

Question 7

galvanic: cathode

Answer 7

electrode at which reduction occurs; positive terminal; electrons gained

Question 8

strongest what reacts with the strongest what

Answer 8

strongest reductant reacts with strongest oxidant

Question 9

potential difference (E)

Answer 9

one half cell has a greater tendency to push electrons into the external circuit that the other half cell

Question 10

cell potential difference equatoin

Answer 10

higher half cell (E) - lower half cell (E)

Question 11

primary cell

Answer 11

disposable and non-recharagble.

go flat when cell reactions equilibrium

Question 12

secondary cell

Answer 12

rechargeable and designed to be reused multiple times

Question 13

recharging secondary cells

Answer 13

products of the reaction must be converted back into the original reactants -> done by connecting cell to ‘charger’