DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ2.a.ii
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.sl.TZ2.a.ii |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Explain | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 2]
18M.2.sl.TZ2.a.ii
Some physical properties of molecular substances result from the different types of forces between their molecules.
The graph shows the boiling points of the hydrides of group 16 elements.
Explain the increase in the boiling point from H2S to H2Te.
[2]
Markscheme
number of electrons increases
London/dispersion/instantaneous induced dipole-induced dipole forces increase
M1: Accept “Mr/Ar increases” or “molecules become larger in size/mass/surface area”.
[2 marks]
