chapter 5 - galvanic cells

Question 1

galvanic cells

Answer 1

an electrochemical cell where chemical energy is converted into electrical energy
done when reactants are separated, but kept in contact by a wire

Question 2

features of galvanic cells

Answer 2

• two half cells
  contains electrode (reducing agent) and electrolyte (oxidising agent)
• wire
• salt bridge

Question 3

labelling electrodes

Answer 3

oxidation at anode (negative electrode)
- negative because source of electrodes
reduction at cathode (positive electrode)
the cell with the better reducing agent is the anode (electrochemical series)
reducing agent - bottom right
oxidising agent - top left

Question 4

types of half cells

Answer 4

metal/ metal ion
transition metal ion/ transition metal ion
non metal ion/ non metal

Question 5

salt bridge

Answer 5

• only ions
• positive ions away from anode
• negative ions towards anode

Question 6

cell voltage

Answer 6

V = E0 (oxidising half cell) - E0 (reducing half cell)
at SLC

Question 7

primary cell

Answer 7

• not rechargeable
• go flat when equilibrium is reached
• named after electrolyte

Question 8

secondary cell

Answer 8

• rechargeable
• products converted back to reactants

Question 9

discharging vs recharding

Answer 9

discharging - secondary cell is producing electricity
electrons coming out of negative electrode (anode)
recharging - electrons are pushed back into the same electrode
anode gains electrons, reduction is occuring, now cathode