Holt Modern Chemistry Chapter 6.3 Section Quiz

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

Tags

NGSS.HS-PS2-4

The salts NaCl _(s) and CaCl_2(s)

• are good conductors of electricity

• are positively charged

• are held together by ionic bonds

• have very low melting points

Tags

NGSS.HS-PS1-3

Compared with solid ionic compounds, solid molecular compounds generally

• have lower melting points

• are more brittle

• are harder

• conduct electricity as liquids

• ionize more rapidly in oil

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

• are hard

• are brittle

• do not conduct electricity in the solid form

• all of the above

Tags

NGSS.HS-PS1-3

In a crystal of sodium chloride, how many oppositely-charged ions does each Na+ and Cl- ion have clustered around it?

• 1

• 2

• 4

• 6

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 other answers are right

Tags

NGSS.HS-PS1-3

The energy released when one mole of an ionic crystalline solid is formed from ions in the gas state is known as

• thermal energy

• lattice energy

• ionization energy

• radiant energy

Tags

NGSS.HS-PS2-4

Some ionic compounds do not dissolve in water because:

• the attractions between the water molecules and the ions are not as strong as the attractions between the ions

• they are less dense than water and float on the surface

• water is a covalent compound and covalent compounds cannot dissolve ionic compounds

• water molecules cannot fit in the spaces between the ions in the crystal lattice

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

• anion

• polyatomic ion

• formula unit

• cation

• molecule