Ch 3 Part 1_Chemical Equations

Ch 3 Part 1_Chemical Equations - Chapter 3 Stoichiometry:...

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1 Stoichiometry: Calculations with Chemical Formulas and Equations Chapter 3 Chapter 3 Chemical Equations Balancing, Types of Equations Compound Composition Atom mass; Atomic and formula weight % Composition Empirical Formulas Mole Amounts; Molar Mass Mole Calculations Amounts in chemical reactions Chapter 3 Worksheets Available on Blackboard Reactions Moles Composition Limiting Reactants Chemical Equations Chemical equations help us to describe chemical reactions. Chemical Equations BEFORE AFTER Types of Reactions (More in Ch.4) Combustion (of a hydrocarbon with O 2 ) Combination Reactions Decomposition Reactions Single Displacement Reactions (Ch.4) Double Displacement Reactions (Ch.4)
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2 Combustion Reactions in Air Hydrocarbons react with oxygen to give carbon dioxide and water: CH 3 CH 3 (g) + O 2 (g) CO 2 (g) + H 2 O(g) Balance it! Combination Reactions: A + B C Mg(s) + O 2 (g) ? Combination and Decomposition Reactions Combination and Decomposition Reactions Combination Reactions: A + B C Mg(s) + O 2 (g) MgO(s) Combination and Decomposition Reactions Combination Reactions: A + B C 2Mg(s) + O 2 (g) 2MgO(s) Fig 3.5 Combination and Decomposition Reactions Decomposition Reactions: C A + B Sodium azide decomposes to its elements: NaN 3 (s) ? (N 3 - is a polyatomic ion) Decomposition Reactions Another example: 2HgO(s) 2Hg(l) + O 2 (g) Rxn
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3 Decomposition Reactions Some compounds decompose to more stable compounds : 2H 2 O 2 (l) 2H 2 O(l) + O 2 (g) CaCO 3 (s) CaO(s) + CO 2 (g) Chemical Composition The quantitative significance of formulas Atomic Weight Molecular Weight / Formula Weight Percent Composition Empirical Formulas What is the mass of an atom? We use the A
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This note was uploaded on 01/27/2010 for the course CHM 71476 taught by Professor Marks during the Spring '10 term at ASU.

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Ch 3 Part 1_Chemical Equations - Chapter 3 Stoichiometry:...

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