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NAMING #5 Naming Molecular Compounds

NAMING #5 Naming Molecular Compounds. WHICH COMES FIRST? The more positive of the 2 elements comes first. The more positive element is the one that is further to the left and down on the periodic table. (i.e., the less ______________________ one comes first.

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NAMING #5 Naming Molecular Compounds

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  1. NAMING #5Naming Molecular Compounds

  2. WHICH COMES FIRST?The more positive of the 2 elements comes first. The more positive element is the one that is further to the left and down on the periodic table. (i.e., the less______________________ one comes first

  3. NAMING THE ELEMENTSThe more positive element is called by its name.The more negative element is called by part of its name and the ending ide. These are the same names as the anions of the elements have.e.g. oxide, sulfide, fluoride, chloride, bromide, iodide, nitride, hydride, selenide

  4. If you are asked to write the name for this ionic compound- Al2S3 - you just say___________________________________You do not need to say dior tri, because aluminum in a compound is always _____, and sulfur in an ionic compound is always ______, so they must exist in a __________ ratio.

  5. However, in molecular compounds, the elements mostly don’t form ________________ charges, because the electrons are_______________, not lost or gained.

  6. Example:What is the formula for phosphorous chloride? The answer is:__________________________________There are 2 different compounds formed from phosphorous and chlorine. They are

  7. PREFIXES MUST BE USEDYou can not tell how many atoms of each element there is in a molecular compound (as you can by using the charges in ionic compounds). Therefore, you must put prefixes in the name to designate how many atoms of each element there is.PCl3 = phosphorous trichloridePCl5 = phosphorous pentachloridePREFIXES YOU MUST KNOWmono onepenta fivedi two hexa sixtri threehepta seventetra four

  8. IMPORTANT RULE:The first element only has a prefix if there are more than one of those atoms.The second element always has a prefix.

  9. EXAMPLES – formulas to namesSF6CO2N2O4

  10. EXAMPLES – Name to formulassulfur trioxide nitrogen trihydridediphosphorouspentasulfide

  11. PRACTICE – Fill in the blanksCCl4 ____________________________Se3F7 ____________________________SiS2 __________________________________________ carbon dioxide______________ silicon tetrabromide_______________ trinitrogenhexachloride

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