DP Chemistry (last assessment 2024)
Question 17N.2.sl.TZ0.3a
| Date | November 2017 | Marks available | [Maximum mark: 4] | Reference code | 17N.2.sl.TZ0.3a |
| Level | sl | Paper | 2 | Time zone | TZ0 |
| Command term | Deduce, Draw | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 4]
17N.2.sl.TZ0.3a
Lewis (electron dot) structures are useful models.
(a)
Draw the Lewis (electron dot) structures of PF3 and PF4+ and use the VSEPR theory to deduce the molecular geometry of each species.
[4]
Markscheme
Accept any combination of dots, crosses and lines.
Ignore missing brackets and positive charge.
Penalize missing lone pairs once only.
Do not apply ECF for molecular geometry.