| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.sl.TZ1.8 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | State | 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.
Suggest why nanoparticles need to be handled with care.
Markscheme
large surface area
[1 mark]
«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]
Examiners report
Syllabus sections
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17N.3.sl.TZ0.6a:
State equations for the formation of iron nanoparticles and carbon atoms from Fe(CO)5 in the HIPCO process.
- 17N.3.sl.TZ0.6c: Discuss one possible risk associated with the use of nanotechnology.
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19M.3.hl.TZ2.4e:
Carbon nanotubes are added to metals to increase tensile strength.
Write an equation for the formation of carbon nanotubes from carbon monoxide.
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18N.3.sl.TZ0.4c:
Arc discharge, consisting of two inert metal electrodes in a liquid solvent, is one method of producing carbon nanotubes (CNTs).
Predict, giving a reason, the electrode at which the solvent cyclohexane, C6H12, will decompose to form CNTs.
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19M.3.sl.TZ1.6a:
Describe the structure and bonding of a carbon nanotube.
Structure:
Bonding:
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19M.3.sl.TZ2.4e:
Carbon nanotubes are added to metals to increase tensile strength.
Write an equation for the formation of carbon nanotubes from carbon monoxide.
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19M.3.hl.TZ1.6b:
Suggest one application for carbon nanotubes.
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17M.3.sl.TZ1.8b:
Suggest why nanoparticles need to be handled with care.
- 17N.3.sl.TZ0.6b: Outline why the iron nanoparticle catalysts produced by the HIPCO process are more efficient...
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19N.3.sl.TZ0.3c:
Nanotubes are used to support the active material in nanocatalysts.
Explain why oxygen cannot be used for the chemical vapour deposition (CVD) preparation of carbon nanotubes.
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18M.3.sl.TZ2.5a:
State the source of carbon for MWCNT produced by arc discharge and by CVD.
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18M.3.sl.TZ1.3b.iii:
Describe how carbon nanotubes are produced by chemical vapour deposition (CVD).
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16N.3.sl.TZ0.5b:
Nanocatalysts play an essential role in the manufacture of industrial chemicals.
(i) Describe the high pressure carbon monoxide (HIPCO) method for the production of carbon nanotubes.
(ii) Outline one benefit of using nanocatalysts compared to traditional catalysts in industry.
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19M.3.sl.TZ1.6b:
Suggest one application for carbon nanotubes.
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19M.3.hl.TZ1.6a:
Describe the structure and bonding of a carbon nanotube.
Structure:
Bonding:
-
18M.3.sl.TZ1.3b.ii:
State one physical property of HDPE that will be affected by the incorporation of carbon nanotubes.
- 20N.3.sl.TZ0.4a: Explain these properties of carbon nanotubes.
- 20N.3.hl.TZ0.4a: Explain these properties of carbon nanotubes.
