* Potassium bromide: KBr

* Iron (III) sulfate: Fe₂(SO₄)₃

* Copper (II) chloride: CuCl₂

* Tetraphosphorus heptanitride: P₄N₇

* Ammonium carbonate: (NH₄)₂CO₃

Explanation:

* Potassium bromide: Potassium (K) has a +1 charge, and bromide (Br) has a -1 charge. They combine in a 1:1 ratio.

* Iron (III) sulfate: Iron (III) has a +3 charge (indicated by the Roman numeral III). Sulfate (SO₄) has a -2 charge. To balance the charges, we need two iron ions and three sulfate ions.

* Copper (II) chloride: Copper (II) has a +2 charge. Chloride (Cl) has a -1 charge. The formula is CuCl₂.

* Tetraphosphorus heptanitride: The prefixes "tetra" and "hepta" indicate four phosphorus (P) atoms and seven nitrogen (N) atoms.

* Ammonium carbonate: Ammonium (NH₄) has a +1 charge. Carbonate (CO₃) has a -2 charge. Two ammonium ions are needed to balance the charge on one carbonate ion.