DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.6
| Date | November 2017 | Marks available | [Maximum mark: 4] | Reference code | 17N.3.sl.TZ0.6 |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Discuss, Outline, State | Question number | 6 | Adapted from | N/A |
6.
[Maximum mark: 4]
17N.3.sl.TZ0.6
Nanotechnology has many applications.
(a)
State equations for the formation of iron nanoparticles and carbon atoms from Fe(CO)5 in the HIPCO process.
[2]
Markscheme
Fe(CO)5 (g) → Fe (s) + 5CO (g)
2CO (g) → C (s) + CO2 (g)
(b)
Outline why the iron nanoparticle catalysts produced by the HIPCO process are more efficient than solid iron catalysts.
[1]
Markscheme
large surface area «on which carbon nanotubes form»
(c)
Discuss one possible risk associated with the use of nanotechnology.
[1]
Markscheme
unknown health effects
OR
unknown effect on immune systems
OR
unknown environmental effects
OR
greater inflammatory response
OR
lung damage/toxicity
OR
hazardous effect on biodiversity
OR
risk of explosion
Do not accept vague responses.