Chemistry Quiz

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

The chemical formula for an ionic compound represents one _____.

• formula unit.

• ion.

• molecule.

• cation.

What is the correct notation for a calcium ion whose outershell is a full octet?

• Ca1+

• Ca2+

• Ca1-

• Ca2-

What is the correct name for the NO3- ion?

• nitrate

• nitrite

• nitride

• 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 and nitrogen?

• 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.