Question

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.)

Answer 1

1) RbF is rubidium fluoride. Rubidium fluoride is salt with ionic bond. Rubidium is cation (goes first in name) and fluorine is anion (fluoride anion).
2) CuO is copper(II) oxide. CuO is oxide (compound that contains at least one oxygen atom and one other element), first goes name of metal, his oxidation state (+2 - II) at the end oxide.
3) (NH₄)₂C₂O₄ is ammonium oxalate. This compound is salt also, ammonium (NH₄⁺) is cation.

Answer 2

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