DP Chemistry (last assessment 2024)
Question 21M.2.hl.TZ2.b(ii)
| Date | May 2021 | Marks available | [Maximum mark: 3] | Reference code | 21M.2.hl.TZ2.b(ii) |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Describe | Question number | b(ii) | Adapted from | N/A |
b(ii).
[Maximum mark: 3]
21M.2.hl.TZ2.b(ii)
The properties of elements can be predicted from their position in the periodic table.
Describe metallic bonding and how it contributes to electrical conductivity.
[3]
Markscheme
electrostatic attraction ✓
between «a lattice of» cations/positive «metal» ions AND «a sea of» delocalized electrons ✓
mobile electrons responsible for conductivity
OR
electrons move when a voltage/potential difference/electric field is applied ✓
Do not accept “nuclei” for “cations/positive ions” in M2.
Accept “mobile/free” for “delocalized” electrons in M2.
Accept “electrons move when connected to a cell/battery/power supply” OR “electrons move when connected in a circuit” for M3.
