Question 21M.2.sl.TZ2.3a
| Date | May 2021 | Marks available | [Maximum mark: 3] | Reference code | 21M.2.sl.TZ2.3a |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Label | Question number | a | Adapted from | N/A |
Oxidation and reduction reactions can have a variety of commercial uses.
A student decides to build a voltaic cell consisting of an aluminium electrode, Al (s), a tin electrode, Sn (s), and solutions of aluminium nitrate, Al(NO3)3 (aq) and tin(II) nitrate, Sn(NO3)2 (aq).
Electron flow is represented on the diagram.
Label each line in the diagram using section 25 of the data booklet.
[3]
Al/aluminium «electrode» AND aluminium nitrate/Al(NO3)3/Al3+ on left ✓
Sn/tin «electrode» AND tin«(II)» nitrate/Sn(NO3)2/Sn2+ on right ✓
salt bridge AND voltmeter/V/lightbulb ✓
Award [1] if M1 and M2 are reversed.
Award [1] for two correctly labelled solutions OR two correctly labelled electrodes for M1 and M2.
Accept a specific salt for “salt bridge”.
Accept other circuit components such as ammeter/A, fan, buzzer, resistor/heating element/R/Ω.