Chemistry Chapter 6.3

What types of bonds are present in an ionic compound that contains a polyatomic ion?

Ionic and covalent bonds

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

The sizes of the atoms, the charges of the ions, the number of ions of different charges, all of the above

The salts NaCl(s) and CaCl2 (s)

are held together by ionic bonds

The chemical formula for sodium chloride, NaCl, represent one

formula unit

because strong attractive forces hold the layers in an ionic crystal in relatively fixed positions ionic compounds are

hard,brittle,not electrical conductors as solids, all of the above

compared with solid ionic compounds, solid molecular compounds generally

have lower melting points

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

lacks molecules

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

lattice energy

what type of energy best represents the strength of an ionic bond

lattice energy

compared with the potential energy of neutral atoms that form the ions, a crystal lattice has

lower potential energy

a charged group of covalently bonded atoms is known as a

polyatomic ion

In a crystal of an ionic compound each anion is surrounded by a number of

positive ions

all ionic bonds are__________ at room temperature

solids

some ionic compunds do not dissolve in water because

the attactions between water molecules are ions are not as strong as the attractions between ions

the forces of attraction between molecules in a molecular compound are generally

weaker than the attractive forces among formula units in ionic bonding