What follows an element’s symbol in a chemical formula to indicate the number of atoms of that element in one molecule of the compound?

• charge sign

• superscripted number

• number in parentheses

• subscripted number

What is the correct name for the NO₃^- ion?

• nitrate

• nitrite

• nitride nitrite

• nitrogen oxide

What is the correct formula for copper(I) cyanide?

• CuCy

• CuCy₂

• CuCN

• Cu₂CN

What is the correct name for the acid CH₃COOH?

• carbonic acid

• carbonate acid

• acetic acid

• acetous acid

What is the correct name for the compound P₂Cl₄.

• phosphorus chloride

• phosphorus tetrachloride

• diphosphorus chloride

• diphosphorus tetrachloride

What is the correct formula for the compound made of magnesium (Mg²⁺) and nitrogen (N^3-)?

• Mg₂N₃

• Mg₃N₂

• MgN₂

• MgN

Oxidation numbers are used to indicate the

• charge on an ion.

• number of atoms or ions in a compound.

• type of bond holding particles together in a compound.

• distribution of electrons among the bonded particles in a compound.

Atoms have an oxidation number of zero in a(n)

• pure element.

• acid.

• ionic compound.

• molecular compound.

What is the oxidation number of nickel in NiCO₃?

• 0

• +1

• +2

• +3

What is the correct name for the compound Ni₂O₃ using the Stock system?

• nickel(II) oxide

• dinickel trioxide

• nickel trioxide

• nickel(III) oxide