Chemistry 8B Quiz Review

What is the oxidation number of Cu in CuSO₄?

• +1

• +2

• -1

• -2

Answer explanation

Find the ON for S in the polyatomic ion SO₄ using an equation. The ON of the polyatomic ion is -2. Then, you can find Cu by using another equation.

What is the oxidation number of Hg in Hg₃(PO₄)₂?

• +2

• +3

• -2

• -3

Answer explanation

Short cut method would be doing the reverse of the criss cross method. The subscript 2 is the ON of Hg and the subscript 3 is the ON of the polyatomic ion PO₄.

The Stock system—used to name ionic compounds containing a metal with multiple oxidation states—uses which of the following?

• arabic numerals

• roman numerals

• coefficients

• none of these

The Greek prefix system is normally used for both ionic and covalent compounds.

• True

• False

Answer explanation

Greek prefixes are used only for covalent bonds (nonmetal and nonmetal).

a compound that contains water molecules in its crystalline structure

• ternary acid

• polyatomic ions

• hydrate

• oxyanion

• binary acid

covalently bonded groups of atoms that carry charges

• ternary acid

• polyatomic ions

• hydrate

• oxyanion

• binary acid

a compound that contains hydrogen, oxygen, and another nonmetal

• ternary acid

• polyatomic ions

• hydrate

• oxyanion

• binary acid

the first element of this two-element compound is hydrogen

• ternary acid

• polyatomic ions

• hydrate

• oxyanion

• binary acid

an anion composed of oxygen and one other element

• ternary acid

• polyatomic ions

• hydrate

• oxyanion

• binary acid

Name the compound: P₂O₅

(a)  

Answer explanation

Covalent bond so use Greek prefixes