DP Chemistry (last assessment 2024)
Question 19M.2.sl.TZ1.a(i)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.sl.TZ1.a(i) |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Describe | Question number | a(i) | Adapted from | N/A |
a(i).
[Maximum mark: 2]
19M.2.sl.TZ1.a(i)
This question is about compounds of sodium.
Describe the structure and bonding in solid sodium oxide.
[2]
Markscheme
«3-D/giant» regularly repeating arrangement «of ions»
OR
lattice «of ions» [✔]
electrostatic attraction between oppositely charged ions
OR
electrostatic attraction between Na+ and O2− ions [✔]
Note: Do not accept “ionic” without description.
Examiners report
Disappointingly many students did not realise that sodium oxide was held by ionic bonds, many said it was covalent or metallic bonding. The ones that knew it was ionic failed to describe it adequately to earn the 2 marks.
