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Chem121-Chapter-3_Beekman

Chem121-Chapter-3_Beekman - Chapter 3 Stoichiometry...

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1 Chapter 3 Stoichiometry: Calculations with Chemical Formulas & Equations © R. Spinney 2010 Chemical Equations Equal quantities of matter exist before and after the chemical reaction (rxn). At the atomic level: atoms are neither created or destroyed during a chemical rxns! This is the foundation of chemical equations: descriptions of chemical rxns. reactant(s) product(s) potassium + water potassium hydroxide + hydrogen Stoichiometry = accounting of chemistry . Numerical balance sheet of a reaction.
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2 Chemical Equations (cont’d) Arrows: forms or produces (implies 100%) equilibrium (rxn can go forward & backward) Reactants: appear to the left of the arrow = starting material Products: appear to the right of the arrow = material formed in the rxn Above / below arrow rxn conditions, i.e. heat ( D ), catalysts, solvents etc. Chemical Equations (cont’d) Physical state indicated by: ( s ) solid K (s) ( l ) liquid H 2 O (l) ( g ) gas H 2 (g) ( aq ) aqueous solution NaOH (aq)
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