Compounds & Formulas.

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CHEMICAL COMPOUNDS AND FORMULAS

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Presentation transcript:

Compounds & Formulas

Compounds There are about 100 million pure substances that have been identified Out of these pure substances, only 118 of them are elements, the rest are compounds Compounds are made up of more than one element that is held together by a chemical bond Every compound is made up of a chemical formula

Chemical Formulas A chemical formula tells us: A) the type of atoms present B) the number of atoms present C) the type of compound

Reading Chemical Formulas E.g. table salt: Sodium Chloride Chemical formula NaCl Count the atoms present 1 Na atom 1 Cl atom

Reading Chemical Formulas Sometimes there are subscripts present. A subscript is a small number that is in a chemical formula E.g. water: H2O 2 H atoms 1 O atom Subscript

Reading Chemical Formulas Sometimes there are brackets with a subscript. E.g. calcium hydroxide (kidney stones) Ca(OH)2 1 Ca atom 2 O atoms 2 H atoms

Reading Chemical Formulas Sometimes there are subscripts in the brackets. E.g. calcium nitrate Ca(NO3)2 1 Ca atom 2 N atoms 6 O atoms (3 oxygens x 2 = 6)

Assignment How to Count Atoms Review Counting Atoms Worksheet Subscripts and Coefficients Chemical Bonding definitions