• I can name binary molecular compounds given the formula.

• I can determine the formula of a binary molecular compound given the name.

Learning Targets

• Binary molecular compounds are named using Greek prefixes. Here are the prefixes you will need to know:

Naming Binary Molecular Compounds

1 Mono 6 Hexa

2 Di 7 Hepta

3 Tri 8 Octa

4 Tetra 9 Nona

5 Penta 10 Deca

• The first element in the formula is named first, and the full element name is used.

• The second element is named by dropping the ending and adding -ide.

• Prefixes are used to denote the number of atoms present.• The prefix mono- is never used for naming the first

element. For example, CO is called carbon monoxide, not monocarbon monoxide.

• If the element name begins with a vowel, the vowel is typically dropped from the prefix name. For example CO4 would be called carbon tetroxide, not carbon tetraoxide.

Naming Binary Molecular Compounds

• The prefix is translated and written as a subscript to the right of the element symbol.

• The elements are written in the formula in the order they appear in the name. For example, carbon tetroxide would be written as CO4.

Formulas for Binary Molecular Compounds

• CO2

Practice ProblemsName the following compounds.

• CO2 Carbon Dioxide

Practice ProblemsName the following compounds.

• CCl4

Practice ProblemsName the following compounds.

• CCl4 Carbon Tetrachloride

Practice ProblemsName the following compounds.

• SO3

Practice ProblemsName the following compounds.

• SO3 Sulfur Trioxide

Practice ProblemsName the following compounds.

• N6O9

Practice ProblemsName the following compounds.

• N6O9 Hexanitrogen Nonoxide (notice the ‘a’ is dropped

from the prefix when the element begins with an ‘a’ or an ‘o’)

Practice ProblemsName the following compounds.

• S5Br10

Practice ProblemsName the following compounds.

• S5Br10 Pentasulfur Decabromide

Practice ProblemsName the following compounds.

• Dinitrogen Pentoxide

Practice ProblemsWrite the correct formula for the following compounds.

• Dinitrogen PentoxideN2O5

Practice ProblemsWrite the correct formula for the following compounds.

• Iodine Trichloride

Practice ProblemsWrite the correct formula for the following compounds.

• Iodine TrichlorideICl3

Practice ProblemsWrite the correct formula for the following compounds.

• Sulfur Hexafluoride

Practice ProblemsWrite the correct formula for the following compounds.

• Sulfur HexafluorideSF6

Practice ProblemsWrite the correct formula for the following compounds.

• Xenon Tetrafluoride

Practice ProblemsWrite the correct formula for the following compounds.

• Xenon TetrafluorideXeF4

Practice ProblemsWrite the correct formula for the following compounds.

• Heptaphosphorus Decoxide

Practice ProblemsWrite the correct formula for the following compounds.

• Heptaphosphorus DecoxideP7O10

Practice ProblemsWrite the correct formula for the following compounds.