Molecular Compounds

Chemistry 112

Naming Binary Molecular Compounds

Composed of two nonmetals.Ions are not used because e- are

not transferred.Nonmetals can combine with other

nonmetals in many different ways.Ex. Carbon and oxygen

Prefixes are used in naming binary molecular compounds.

Table 9.4, p. 269They identify the number of atoms

present.

Some Rules to Remember…

The prefix mono- only applies to the second nonmetal.

The suffix of the second nonmetal is changed to –ide.

Do not reduce to the lowest common ratio. Leave the subscripts alone.

Questions 22-24, p. 270

Acids and Bases

Acids are ionic compounds with unique properties.

There is more than one way to define an acid but for now, it will be identified as a compound that contains one or more hydrogen atoms and produces hydrogen ions (H+) when dissolved in water.

For the most part, acids assume the form HnXH is the hydrogen that has to be

presentn is the subscript associated with the

charge of the anion or the hydrogen ions combined with the particular anion

X is the anion present

Naming AcidsClassical

When the name of the anion ends in –ide, the acid name begins with the prefix hydro- and the suffix of the anion is changed to –ic followed by the word acid.

When the anion name ends in –ite, the acid name is the stem of the anion with the suffix –ous followed by the word acid.

When the anion ends in –ate, the acid name is the stem of the anion with the suffix –ic followed by the word acid.

Modern naming tells you to identify the state of matter, then the word hydrogen and then the name of the anion.

Acids and Bases – writing formulas

Rely on the name of the formula to guide you with the rules.

Hydrogen ions have a charge of 1+.The anions charge is used as well.Use the crisscross method to determine the

overall formula.

A base is an ionic compound that produces hydroxide ions in water.

They are named the same way as ionic compounds.

Questions 29-32, p. 273.