DP Chemistry (last assessment 2024)
Question 20N.2.hl.TZ0.d(v)
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.2.hl.TZ0.d(v) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Describe | Question number | d(v) | Adapted from | N/A |
d(v).
[Maximum mark: 2]
20N.2.hl.TZ0.d(v)
Nickel catalyses the conversion of propanone to propan-2-ol.
Describe the bonding in metals.
[2]
Markscheme
electrostatic attraction ✔
between «a lattice of» metal/positive ions/cations AND «a sea of» delocalized electrons ✔
Accept “mobile/free electrons”.
Examiners report
Most candidates were aware that metallic bonding involved a "sea of electrons", but were unsure about surrounding what and could not identify that it was electrostatic attraction holding the metal together.
