Zadanie 7b
Wzorowane na: Chemistry HL Paper 2, May 2026, TZ2, pytanie 7(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 7a-7b.
Nickel forms different coloured complex ions with a variety of ligands.
| Complex ion | [Ni(H2O)6]2+ | [Ni(NH3)6]2+ | [Ni(en)3]2+ |
|---|---|---|---|
| Colour | green | blue | violet |
en = ethane-1,2-diamine, H2NCH2CH2NH2
Polecenie
Explain the origin of the colours of the nickel complexes.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
Any three of:
partially filled d-orbitals «in the Ni2+ ion» ✔
the ligands cause the d-orbitals to split «into two sets of different energy» ✔
light / energy is absorbed as electrons are promoted to a higher energy level «d–d transitions» ✔
the energy gap / wavelength absorbed corresponds to the visible region «of the spectrum, and the colour seen is made up of the light that is not absorbed» ✔
Schemat punktowania
[3 max] one mark for each of three different marking points. Do not accept ‘the colour observed is the complementary colour of the light absorbed’ for the last point.