03_-_Chemical_Reactions

03_-_Chemical_Reactions - 03ChemicalReactions 4.14.5...

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03 – Chemical Reactions 4.1-4.5
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Some Definitions A Chemical Reaction is a process by which a chemical change occurs Reactants – substances that are transformed Products – substances that are produced Evidence of a chemical reaction: colour change formation of a solid (precipitate) production of a gas temperature change Reaction of sulfuric acid and sugar. The acid dehydrates the sugar forming a pillar of carbon and steam. ( Photo Researchers, Inc. ) 2 03 - Chemical Reactions
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The Chemical Equation Chemical equations describe the changes that occur in chemical reactions: N 2 O 5 NO 2 + O 2 Chemical equations must be balanced , so that the number of atoms on the reactant side are equal to the number of atoms on the product side: 2 N 2 O 5 4 NO 2 + O 2 Stoichiometric chemical equation describes only the net changes taking place in a reaction and does not necessarily correspond to what occurs at the molecular level 3 03 - Chemical Reactions
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Mechanistic Equation Mechanistic equations describe the steps required to go from reactants to products at the molecular level For the above equation, a possible mechanistic equation could be: 2 N 2 O 5 2 NO 2 + 2 NO 3 NO 3 + NO 2 NO + NO 2 + O 2 NO 3 + NO 2 NO 2 2 N 2 O 5 4 NO 2 + O 2 Mechanistic equations must add up to the stoichiometric chemical equation. 4 03 - Chemical Reactions
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Stoichiometric Calculations Stoichiometric relationships are used to calculate the proportions of atoms in a molecule or the proportions of products and reactants in a given chemical reaction For the reaction: aA + bB cC + dD For example, 2N 2 O 5 4NO 2 + O 2 2 moles N 2 O 5 : 4 moles NO 2 : 1 mole O 2 1 4 2 2 2 5 2 O mol NO mol O N mol = = d D mol c C mol b B mol a A mol = = = 5 03 - Chemical Reactions
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This note was uploaded on 09/17/2011 for the course CHE 102 taught by Professor Simon during the Spring '08 term at Waterloo.

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03_-_Chemical_Reactions - 03ChemicalReactions 4.14.5...

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