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chemistry

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Naming and Writing Formulas for Molecular Compounds

> Binary Molecular Compounds

Binary molecular compounds are made of 2 nonmetals bound together.

Since they are binary, they must end in –ide.

Binary molecular compounds are named using prefixes

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A prefix in the name of a binary molecular compound tells how many atoms of an element are present in each molecule of the compound.

9.3 Naming Binary Molecular Compounds

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Carbon and oxygen combine to form carbon monoxide (CO) and carbon dioxide (CO2), but these two invisible gases are very different.


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Sitting in a room with small amounts of CO2

in the air would not present any problems. If the same amount of CO were in the room, you could die of asphyxiation. A naming system that distinguishes between these two compounds is needed.


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Some guidelines for naming binary molecular compounds:

• Name the elements in the order listed in the formula.

• Use prefixes to indicate the number of each kind of atom.


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• Omit the prefix mono- when the formula contains only one atom of the first element in the name.

• The suffix of the name of the second element is -ide.

• If there is a double vowel, eliminate one. (i.e. it is carbon monoxide not carbon monooxide)


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Use the prefixes in the name to tell you the subscript of each element in the formula. Then write the correct symbols for the two elements with the appropriate subscripts.

9.3 Writing Formulas for BinaryMolecular Compounds

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