4. Given the chemical formulas of the following compounds, name each compound and state the rules applied to determine each name. Score • RbF • CuO • (NH4) 2C2O4 (Note: C2O4 - is called oxalate.)

1) RbF - rubidium fluoride

Rubidium fluoride is salt with ionic bond.

Rubidium is a cation which should be named first and followed by fluorine which is an anion.

2) CuO - copper (II) oxide

CuO is oxide which first goes name of metal and its oxidation state (+2 - II) at the end oxide.

3) (NH₄) ₂C₂O₄ - ammonium oxalate.

This is a salt compound and ammonium (NH₄⁺) is cation and the chemical formula for oxalate is C₂O₄^-2