| Date | May 2011 | Marks available | 2 | Reference code | 11M.3.sl.TZ1.C1 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | State | Question number | C1 | Adapted from | N/A |
Question
Many recent developments in chemistry have involved making use of devices that operate on a nanoscale.
State the scale at which nanotechnology takes place and outline the importance of working at this scale.
State one public concern regarding the development of nanotechnology.
One development has been the production of nanotubes. Describe the way in which the arrangement of carbon atoms in the wall and sealed end of a nanotube differ.
Markscheme
a scale of 1–100nm;
careful positioning of individual atoms / ability to control/manipulate at atomic scale / production of material with novel properties;
health concerns / toxicity / effects on the human immune system / the lack of public involvement in policy discussions;
in the walls carbon atoms only form hexagons;
in the ends the carbon atoms form both hexagons and pentagons;
Examiners report
Though many candidates could quote the scale that nanotechnology deals with, few could state specific concerns about its implementation, and hardly any could distinguish between the bonding in the walls and the ends of nanotubes.
Though many candidates could quote the scale that nanotechnology deals with, few could state specific concerns about its implementation, and hardly any could distinguish between the bonding in the walls and the ends of nanotubes.
Though many candidates could quote the scale that nanotechnology deals with, few could state specific concerns about its implementation, and hardly any could distinguish between the bonding in the walls and the ends of nanotubes.
