4.1.5 State that transition elements can form more than one ion IB Chemistry SL

The reason why this is true is not needed in SL. Specifically mentioned in the syllabus is that iron ions can have a charge of 2+ or 3+. Another example is copper ions with a 1+ or 2+ charge.

[fanChelsea]

Fe iron- 2:8:8:8 it is already stable? full valence shell why would it 10 electrons?

[yuukiasuna]

Fe wants a stable half 3d orbital with/without a half full 4s orbital.
(if SL students read this, don't hurt your brain.) :)

[ibchemvids]

How catalysis works is actually quite interesting.
How catalysts actually work is not part of IB chemistry
;)

[SophiaBaba]

oh nooo it must be cause of the orbitals. Right?

[ibchemvids]

Check the playlists - all HL is there!

[fanChelsea]

good thing im SL. and im back on ur vids again. exams in may haha

[SophiaBaba]

Does the Fe thing have anything to do with the variable oxidation numbers for transition metals?

[ibchemvids]

Hehe - this all only works up to 20 electrons - then you need to learn a new way of doing it (HL)