Find the oxidation states of the metals in the following compounds.

FeBr₃

CrO₃

MnN₃

Cu₃N₂

CuLaTa (the farewell molecule)

Determine what molecule/atom is being oxidized and which is being reduced in each of the following reactions.

K + H₂O   -->   KOH + H₂

FeO + O₂   -->   Fe₂O₃

Ca + F₂   -->   CaF₂