DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.9a
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.sl.TZ0.9a |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
17N.3.sl.TZ0.9a
Lactose is a disaccharide formed by the condensation reaction of the monosaccharides galactose and glucose.
(a)
Describe what is meant by a condensation reaction.
[2]
Markscheme
«reaction in which» two reactants/molecules/functional groups bond/react «to form a larger molecule/single main product»
small/tiny molecule
OR
H2O formed
Accept formula or name of a specified small molecule other than water such as ammonia, ethanoic/acetic acid,
ethanol, hydrogen sulfide etc. for M2.
Do not accept just “molecule formed”.
Award [1 max] for an example giving an equation of a condensation reaction such as the formation of a disaccharide.
