Which chemical formula is incorrectly matched with its name?
A. iron(III) bromide: FeBr3
B. nitrous acid: HNO2
C. dichlorine heptoxide: Cl2O7
D. calcium(III) phosphate: Ca3(PO4)2
E. zinc chloride: ZnCl2
We're being asked to determine which of the given is named incorrectly.
Let's first review the rules for naming compounds.
Ionic compounds - are usually made of metals and non-metals.
The rules for naming ionic compounds are as follows:
1. The metal keeps its name and is named and written first.
– For transition metals, we use Roman numerals to denote its charge.
2. The nonmetal/polyatomic ion keeps its base name but has its ending changed to –ide.
Covalent compound - composed of nonmetals.
The rules for naming covalent compounds are as follows:
1. The first nonmetal is named normally and uses all numerical prefixes except mono.
2. The second nonmetal keeps its base name but has its ending change to –ide. It will also use any of the numerical prefixes.
The numerical prefixes are:
Mono – 1 Di – 2
Tri – 3 Tetra – 4
Penta – 5 Hexa – 6
Hepta – 7 Octa – 8
Nona – 9 Deca – 10
Rules for Naming Binary Acids:
a. The prefix will be hydro-
b. Use the base name of the nonmetal (anion)
c. The suffix will be -ic acid
Rules for Naming Oxyacids or Oxoacids:
a. If the polyatomic ion ends with -ate then change the ending to -ic acid
b. if the polyatomic ion ends with -ite then change the ending to -ous acid