DP Chemistry (last assessment 2024)
Question 17N.2.hl.TZ0.4a
| Date | November 2017 | Marks available | [Maximum mark: 6] | Reference code | 17N.2.hl.TZ0.4a |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Deduce, Draw | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 6]
17N.2.hl.TZ0.4a
Lewis (electron dot) structures are useful models.
(a)
Draw the Lewis (electron dot) structures of PF3 and PF5 and use the VSEPR theory to deduce the molecular geometry of each species including bond angles.
[6]
Markscheme
Accept any combination of dots, crosses and lines.
Penalize missing lone pairs once only.
Do not apply ECF for molecular geometry.
Accept values in the range 95–109 for PF3.