| Date | November 2017 | Marks available | 1 | Reference code | 17N.2.hl.TZ0.4 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | State | Question number | 4 | Adapted from | N/A |
Question
Lewis (electron dot) structures are useful models.
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]
a.
Predict whether the molecules PF3 and PF5 are polar or non-polar.
[1]
b.
State the type of hybridization shown by the phosphorus atom in PF3.
[1]
c.
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.
a.
PF3 polar AND PF5 non-polar
Apply ECF from part (a) molecular geometry.
b.
sp3
c.
Examiners report
[N/A]
a.
[N/A]
b.
[N/A]
c.
