Date | November 2019 | Marks available | 2 | Reference code | 19N.3.sl.TZ0.10 |
Level | SL | Paper | 3 | Time zone | TZ0 |
Command term | Explain | Question number | 10 | Adapted from | N/A |
Question
Vitamins are organic compounds essential in small amounts.
State the name of one functional group common to all three vitamins shown in section 35 of the data booklet.
Explain the biomagnification of the pesticide DDT.
Explain why maltose, C12H22O11, is soluble in water.
Markscheme
hydroxyl ✔
NOTE: Accept “hydroxy” but not “hydroxide”.
Accept “alkenyl”.
Do not accept formula.
accumulates in fat/tissues/living organisms
OR
cannot be metabolized/does not break down «in living organisms»
OR
not excreted / excreted «very» slowly ✔
passes «unchanged» up the food chain
OR
increased concentration as one species feeds on another «up the food chain» ✔
NOTE: Accept “lipids” for “fat”.
«solubility depends on forming many» H-bonds with water ✔
maltose has many hydroxyl/OH/oxygen atom/O «and forms many H-bonds» ✔
NOTE: Reference to “with water” required.
Accept “hydroxy” for “hydroxyl” but not “hydroxide/OH–”.
Reference to many/several OH groups/O atoms required for M2.