Question 17N.3.sl.TZ0.10
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.3.sl.TZ0.10 |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Explain, State | Question number | 10 | Adapted from | N/A |
Vitamins can be water-soluble or fat-soluble.
Explain, at the molecular level, why vitamin D is soluble in fats. Use section 35 of the data booklet.
[2]
«mainly» hydrocarbon/non-polar «structure»
forms London/dispersion/instantaneous induced dipole-induced dipole forces «with fats»
Accept “forms van der Waals’/vdW forces”.
Award [1 max] for “contains only one OH/hydroxyl AND cannot form «enough» H-bonds”.
State one function of vitamin D in the body.
[1]
helps absorb calcium
OR
helps build bones
OR
helps keep bones healthy
OR
helps block the release of parathyroid hormone
OR
helps in muscle function
OR
helps immune system function
OR
cell growth
OR
reduction of inflammation
OR
protection from osteoporosis
OR
prevents rickets
Accept helps prevent colon/breast/prostate cancer.
Accept treat/prevent diabetes/heart disease/high blood pressure/multiple sclerosis.
Accept other correct answers.
