1 - Understanding Chemical Formulas & Reactions...

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Chemistry 111 Understanding Chemical Harwood Formulas & Reactions 1 What is a Chemical Formula? A combination of chemical symbols and numbers ( as subscripts ) that shows which elements are present in a compound and how many atoms of each element are present. Examples: CO 2 , C 6 H 6 , N 2 O 5 , C 12 H 22 O 11 In detail: sucrose - C 12 H 22 O 11 12 carbon atoms 11 oxygen atoms 45 atoms total 22 hydrogen atoms Chemical Reactions A chemical reaction is a rearrangement of atoms that results in the formation of one or more new compounds. reactants products reactants – left side of arrow products – right side of arrow subscripts – indicate numbers atoms in the compounds coefficients numbers in front of reactants and products showing the ratio in which they react when balancing chemical equations, change the coefficients NOT the subscripts Balancing Chemical Equations Law of Conservation of Mass – dictates that there must be the same number of each
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This note was uploaded on 02/26/2012 for the course CHEM 111 taught by Professor Cao during the Fall '07 term at Purdue University-West Lafayette.

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1 - Understanding Chemical Formulas & Reactions...

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