15.5 coloured ions

Question 1

under what conditions does the d-block element split?

Answer 1

ion of d-block element is surrounded by other ions / H2O in aq.

Question 2

why are complex ions coloured?

Answer 2

1- molecules/ions causes d-orbital to split
2- light absorbed to promote e- to higher d-orbitals
3- remaining light is transmitted

Question 3

why do different complex compounds have different colours?

Answer 3

1- d-orbitals split into 2 different energies
2- difference in energy depends on the ligands
3- difference in energy leads to different wavelengths of light absorbed
4- unabsorbed frequencies/wavelengths are reflected

Question 4

why are there some complex ions without a colour?

Answer 4

no visible light is absorbed

Question 5

by which 3 ways would a colour change in a transition metal ion?

Answer 5

oxidation number, ligands, coordination number

Question 6

why would the colour change due to the mentioned methods?

Answer 6

change in frequency of light absorbed