DP Chemistry (last assessment 2024)
Question 19N.2.hl.TZ0.6f(i)
| Date | November 2019 | Marks available | [Maximum mark: 3] | Reference code | 19N.2.hl.TZ0.6f(i) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Apply, Describe | Question number | f(i) | Adapted from | N/A |
f(i).
[Maximum mark: 3]
19N.2.hl.TZ0.6f(i)
Copper forms two chlorides, copper(I) chloride and copper(II) chloride.
Dilute copper(II) chloride solution is light blue, while copper(I) chloride solution is colourless.
(f(i))
Describe how the blue colour is produced in the Cu(II) solution. Refer to section 17 of the data booklet.
[3]
Markscheme
«ligands cause» d-orbitals «to» split ✔
light absorbed as electrons transit to higher energy level «in d–d transitions»
OR
light absorbed as electrons promoted ✔
energy gap corresponds to «orange» light in visible region of spectrum ✔
colour observed is complementary ✔
