9.3 Naming and Writing Formulas for Molecular Compounds

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chemistry

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9.3

Naming and Writing Formulas for

Molecular Compounds

One milligram of gold is worth

only about one cent, but one

kilogram of gold is worth

approximately $12,500. The

correct prefix ( milli- or kilo-)

makes quite a difference!

Prefixes are important in

chemistry, too. The prefixes in

the name of a binary

molecular compound tell you

its composition.

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9.3

Naming and Writing

Formulas for Molecular

Compounds

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Naming Binary Molecular

Compounds

Naming Binary Molecular Compounds

What does a prefix in the name of a

binary molecular compound tell you

about the compound¡¯s composition?

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9.3

Naming and Writing

Formulas for Molecular

Compounds

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Naming Binary Molecular

Compounds

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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9.3

Naming and Writing

Formulas for Molecular

Compounds

>

Naming Binary Molecular

Compounds

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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9.3

Naming and Writing

Formulas for Molecular

Compounds

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Naming Binary Molecular

Compounds

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.

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9.3

Naming and Writing

Formulas for Molecular

Compounds

>

Naming Binary Molecular

Compounds

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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9.3

Naming and Writing

Formulas for Molecular

Compounds

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Naming Binary Molecular

Compounds

? 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.

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9.3

Naming and Writing

Formulas for Molecular

Compounds

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Writing Formulas for Binary

Molecular Compounds

Writing Formulas for Binary Molecular

Compounds

How do you write the formula for a

binary molecular compound?

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9.3

Naming and Writing

Formulas for Molecular

Compounds

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Writing Formulas for Binary

Molecular Compounds

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.

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