| Date | November 2017 | Marks available | 2 | Reference code | 17N.3.sl.TZ0.6 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | 6 | Adapted from | N/A |
Question
Nanotechnology has many applications.
State equations for the formation of iron nanoparticles and carbon atoms from Fe(CO)5 in the HIPCO process.
[2]
a.
Outline why the iron nanoparticle catalysts produced by the HIPCO process are more efficient than solid iron catalysts.
[1]
b.
Discuss one possible risk associated with the use of nanotechnology.
[1]
c.
Markscheme
Fe(CO)5 (g) → Fe (s) + 5CO (g)
2CO (g) → C (s) + CO2 (g)
a.
large surface area «on which carbon nanotubes form»
b.
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.
c.
Examiners report
[N/A]
a.
[N/A]
b.
[N/A]
c.
