| Date | November 2017 | Marks available | 1 | Reference code | 17N.2.sl.TZ0.3 |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Predict | Question number | 3 | Adapted from | N/A |
Question
Lewis (electron dot) structures are useful models.
Draw the Lewis (electron dot) structures of PF3 and PF4+ and use the VSEPR theory to deduce the molecular geometry of each species.
[4]
a.
Predict with a reason, whether the molecule PF3 is polar or non-polar.
[1]
b.
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.
a.
polar AND bond polarities/dipoles do not cancel out
OR
polar AND unsymmetrical distribution of charge
Apply ECF from part (a) molecular geometry.
b.
Examiners report
[N/A]
a.
[N/A]
b.
Syllabus sections
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