Chemical Names and Formulas -- Molecular Compounds --

1. 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: dichlorineoctoxide

2. 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”.)

3. 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.)

4. 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: