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Molecular Compounds

Molecular Compounds. Writing Names and Formulas. Molecular Compounds. Molecular compounds are made of molecules. They are made by joining nonmetal atoms together into molecules. Naming is Easier. A molecular compound’s name tells you the number of atoms through the use of prefixes. Prefixes.

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Molecular Compounds

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  1. Molecular Compounds Writing Names and Formulas

  2. Molecular Compounds • Molecular compounds are made of molecules. • They are made by joining nonmetal atoms together into molecules.

  3. Naming is Easier • A molecular compound’s name tells you the number of atoms through the use of prefixes.

  4. Prefixes • 1 mono- • 2 di- • 3 tri- • 4 tetra- • 5 penta- • 6 hexa- • 7 hepta- • 8 octa- • 9 nona- • 10 deca-

  5. Prefixes • The name will consist of two words. Prefix name prefix name -ide • One exception is we don’t write mono- if there is only one of the first element.

  6. Prefixes • The following double vowels cannot be used when writing names: • (oa) • (oo)

  7. Example • NO2 • There is one nitrogen • mononitrogen • But, you cannot use mono- on the first element, so drop the prefix. • mononitrogen • nitrogen

  8. Example • NO2 • There are two oxygens • dioxygen

  9. Example • NO2 • dioxygen • You need the suffix -ide • diox ygen ide

  10. Example • NO2 • nitrogen dioxide

  11. Example • N2O • There are two nitrogens • dinitrogen • There is one oxygen • monooxygen

  12. Example • N2O • monooxygen • You cannot run (oo) together, so • monoxygen

  13. Example • N2O • monoxygen • You need the suffix -ide • monox ygen ide

  14. Example • N2O • dinitrogen monoxide

  15. Problem • Name the following molecular compounds. • Cl2O7 dichlorine heptoxide • CBr4 carbon tetrabromide

  16. Problem • Name the following molecular compounds. • CO2 carbon dioxide • BCl3 boron trichloride

  17. Naming Molecular Compounds • You will not need to criss-cross oxidation numbers. • Molecular compounds name tells you the number of atoms through the use of prefixes.

  18. Example • diphosphorus pentoxide • The name implies there are 2 phosphorous atoms and 5 oxygens. P2O5

  19. Example • sulfur hexaflouride • The name implies there is 1 sulfur atom and 6 fluorines. SF6

  20. Problem • Write the formulas for the following molecules. • tetraiodide nonoxide I4O9 NO3 • nitrogen trioxide

  21. Problem • Write the formulas for the following molecules. • carbon tetrahydride CH4 PF3 • phosphorus trifluoride

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