14_reactions_1 - Reactions Chapter 3 Combustion...

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Reactions Chapter 3 Combustion Chapter 4 Reactions Decomposition Combination Exchange reactions (Metathesis) Formation of a precipitate ormation of a gas Formation of a gas Formation of a week or non- electrolyte Single Displacement Reactions Redox reactions Oxidation numbers Mary J. Bojan Chem 110 1
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Balancing Chemical Equations Law of conservation of mass: atter cannot be lost in any matter cannot be lost in any chemical reaction Mary J. Bojan Chem 110 2
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Patterns of reactivity: these are a way of keeping reactions organized. They help us to predict products nd reactants) (and reactants). (Complete) Combustion reactions (Chapter 3) ) + 5O ) CO ) + 4H (g) C 3 H 8 (g) + 5O 2 (g) 3CO 2 (g) + 4H 2 O(g) Combination reactions (Chapter 3) 2Mg(s) + O 2 ( ) 2MgO(s) Decomposition reactions (Chapter 3) PbCO 3 (s) PbO(s) + CO 2 (g) Know how to balance a chemical reaction Mary J. Bojan Chem 110 3
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Write balanced reactions for The combustion of ethanol CH 3 CH 2 OH he decomposition of alcium arbonate aCO The decomposition of calcium carbonate CaCO 3 The combination of oxygen and hydrogen to form water. Mary J. Bojan Chem 110 4
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Patterns of reactivity Exchange reactions (Chapter 4) Precipitation b O q +2K I( q bI ) 2KNO q Pb(NO 3 ) 2 (aq) + 2KI(aq) PbI(s) + 2KNO 3 (aq) Neutralization NaOH(aq) + HCl(aq) NaCl(aq) + H 2 O( ) Gas formation 2HCl(aq) + Na 2 S(aq) H 2 S(g) + 2NaCl(aq) ingle displacement reactions hapter 4) Single displacement reactions (Chapter 4) 2Ca(s) + O 2 (g) 2CaO(s) now how to balance a chemical reaction Mary J. Bojan Chem 110 5 Know how to balance a chemical reaction
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Exchange positive ions to get products A D + X Z A Z + X D Called Exchange reaction (Double Displacement) Example: Reactants: Pb (NO 3 ) 2 + K I Balance the reaction. Does anything happen? TRY! Do you have to do the reaction to know? Mary J. Bojan Chem 110 6
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Metathesis Reactions ouble Displacement) (Double Displacement) Given reactants: exchange positive ions to get roducts products Requires a driving force (otherwise nothing happens) Driving Forces 1. Precipitate forms 2. Weak or nonelectrolyte forms 3. Gas forms How do you know what is happening?
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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14_reactions_1 - Reactions Chapter 3 Combustion...

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