Presentation9_061013

Presentation9_061013 - Chem 6A Presentation#9 Overview...

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Chem 6A Presentation #9 2006-10-13 1 Overview Fundamentals H: Chemical equations Chemical reactions; reactants, products, reagents Stoichiometry; balancing equations Fundamentals I: Aqueous solutions and precipitation Solubility; electrolytes Precipitation reactions Ionic equations Using precipitation for analysis
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2 Chemical equations Stoichiometry : quantitative relationship between reactants and products in a chemical reaction A chemical reaction is the process of chemical change, in which one or more substances are converted into other substances. Chemical equations illustrate chemical (& sometimes physical) change. Reactants Products
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3 Chemical equations
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4 Chemical equations
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5 Balancing chemical equations 1) Create a “skeleton” equation, showing the chemical formulas of the reactants and products., e.g.: Mg + O 2 MgO 2) Balance atoms on each side of the “ ” using stoichiometric coefficients : __Mg + __O 2 __MgO 1 Mg + O 2 1 MgO 2Mg + 1 O 2 2MgO 3) Check atom balance and specify the states of matter ( s , l , g , aq ): 2Mg (s) + O 2 (g) 2MgO (s)
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6 Chemical equations If high temperature or heat is required for a reaction to occur, it may be indicated by a capital Greek letter delta (∆) above or below the reaction arrow: A catalyst is a substance that increases the rate of a reaction, but is not consumed in the reaction. The presence of a catalyst may be indicated by placing its formula or name above the reaction arrow: CH 3 OH + CO CH 3 COOH Rh, I
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7 The information in a balanced chemical equation
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8 Balancing chemical equations
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9 Balancing chemical equations Balance the following skeletal chemical equation: _AgNO 3 (s) _Ag(s) + _NO 2 (s) + _O 2 (g)
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10 Balancing chemical equations Balance the following skeletal chemical equation: 1 AgNO 3 (s) _Ag(s) + _NO 2 (s) + _O 2 (g) 1 AgNO 3 (s) 1 Ag(s) + 1 NO 2 (s) + O 2 (g)
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Presentation9_061013 - Chem 6A Presentation#9 Overview...

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