| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.sl.TZ1.8 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Suggest | Question number | 8 | Adapted from | N/A |
Question
Lanthanum nanoparticles are incorporated into certain catalysts and the electrodes of some fuel cells.
State the major advantage that nanoparticles have in these applications.
[1]
a.
Suggest why nanoparticles need to be handled with care.
[1]
b.
Markscheme
large surface area
[1 mark]
a.
«potentially» explosive
OR
small size/large surface area could give dangerously fast reactions
OR
unknown health effects
OR
potentially toxic
OR
immune system/allergy concerns
Do not accept just “dangerous/poisonous/toxic”.
Accept other valid concerns.
[1 mark]
b.
Examiners report
[N/A]
a.
[N/A]
b.
