Chemical Names and Formulas-- Molecular Compounds --

Molecular compound naming and formula-writing• Molecular compounds are made up of__________________________• Examples

– H2O (water)– H2O2 (hydrogen peroxide)

• Because molecular compounds are NOT made up of ions, ________________________________________________________________________

• Examples of naming– CO2: carbon dioxide– Cl2O8: dichlorine octoxide

Chemical Names and Formulas-- Molecular Compounds --

– 1:– 2: – 3: – 4: – 5: – 6: – 7: – 8: – 9: – 10:

• The vowel at the end of a prefix is often dropped when the name of the element begins with a vowel. (Example: O7 would be expressed as “heptoxide” instead of “heptaoxide”.)

Chemical Names and Formulas-- Molecular Compounds --

• Rules for naming molecular compounds– First element

• If the first element listed has only ____________________, no prefix is needed, so you just state the name of the element.– (Example: NO2 would start off as “nitrogen” …)

• If the first element listed has ________________________, add a prefix on the element name. – (Example: N2O would start off as “dinitrogen” …)

– Second element• Add on a prefix (even if there is only one atom of that element).• Keep the first syllable of the element and

________________________. – (Examples: “oxide,” “nitride,” etc.)

Chemical Names and Formulas-- Molecular Compounds --

– Examples of naming molecular compounds• OF2:• SO3:• O2F2:• N2O5:• XeF4:

• Rules for writing molecular formulas– If you do not see a prefix before the element,____________________________________________________________________________– If you see a prefix before the element, the prefix tells you __________________________________________________________________– Examples of writing molecular formulas

• Carbon tetrachloride: • Phosphorus pentafluoride: