5.2.3 redox and cells

Question 1

MnO4– half equation

Answer 1

MnO4- (aq) + 5e- + 8H+ (aq) → Mn2+ (aq) + 4H2O (l)

Question 2

redox cell diagram

Answer 2

-salt bridge connects the two
-voltmeter in middle
-if only aqueous ions then Pt used as electrode
-for gaseous use tube with Pt and at 100kPa (std con)
-all solutions of each ion to 1M
-
-

Question 3

for standard

Answer 3

25 deg C
100kPa

Question 4

Fe2+ half equation

Answer 4

Fe2+ (aq) → Fe3+ (aq) + e-

Question 5

iodine half equation

Answer 5

I2(aq) + 2e- → 2I-(aq)

Question 6

differences between fuel and storage cells

Answer 6

storage cell = electrochemical cell
fuel cell has reacts with oxygen to give electrical energy/ voltage
fuel cell require continuous supply of fuel and oxidant
fuel cell operates continuously
storage cells risks of toxicity snd fire because Li based
storage cells are rechargeable