class3a - Class#3 Introduction to Chemical Reactions CHEM...

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Class #3 Introduction to Chemical Reactions CHEM 107 A. Bengali Texas A&M University Qatar
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) Nicotine contains 74.0% C, 8.65% H, and 17.35% N. what is the chemical formula of nicotine? Atomic weights for C, H, and N are 12, 1, and 14.
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Empirical vs. Molecular formulas ) Nicotine shows difference ) Empirical formula: simplest possible formula with correct ratios of atoms ) Molecular formula: formula showing actual composition of a molecule
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Chemical Reactions ) Transformation of one or more chemical species into new substances ) “reactants” “products” ) Planning a synthesis is a “chemical design” problem
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Chemical Equations ) Written description of a reaction ) Varying information: physical states, conditions ) Doesn’t mean it happens! C (diamond) + O 2 (g) CO 2 (g)
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Types of Reactions (unbalanced eqs.) ) “addition” or “combination” C 2 H 4 + H 2 C 2 H 6 ) “decomposition” NH 4 NO 3 N 2 + O 2 + H 2 O ) “substitution” or “displacement” Mg + HCl MgCl 2 + H 2
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This note was uploaded on 03/29/2008 for the course CHEM 107 taught by Professor Generalchemforeng during the Spring '07 term at Texas A&M.

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class3a - Class#3 Introduction to Chemical Reactions CHEM...

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