Ionic Bonding and Ionic Compounds

An ionic compound is not represented by a molecular formula because an ionic compound

• does not contain bonds.

• can form crystalline solids.

• has no net charge.

• lacks molecules.

Compared with the energies of neutral atoms that form the ions, a crystal lattice has

• zero potential energy.

• higher potential energy.

• lower potential energy.

• equal potential energy.

The salts NaCl(s) and CaCl₂(s)

• a. are good conductors of electricity in an aqueous solution.

• b. are positively charged.

• c. are held together by ionic bonds.

• Both (a) and (c)

Compared with solid ionic compounds, solid molecular compounds generally

• have lower melting points.

• are more brittle.

• are harder.

• conduct electricity as liquids.

Because strong attractive forces hold the layers in an ionic crystal in relatively fixed positions, ionic compounds

• are hard.

• are brittle.

• are not electrical conductors as solids.

• All options.

The arrangement of ions within a crystal structure and the strengths of the attractions between them vary with the

• sizes of the ions.

• charges of the ions.

• numbers of ions of different charges.

• All of the above

A charged group of covalently bonded atoms is known as a(n)

• anion.

• polyatomic ion.

• formula unit.

• cation.

All ionic compounds are ______ at room temperature.

• liquid

• solid

• amorphous

• gaseous

Ionic compounds are ______ conductors of electricity in the _________ state.

• poor, liquid

• good, solid

• poor, solid

• good, liquid

Polyatomic ions have a charge that results from either a ________ or an ________ of electrons.

• sharing

• bonding

• excess

• shortage