chapter4.part1.forBB.2008

chapter4.part1.forBB.2008 - Chapter 4: Quantities of...

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1 Chapter 4: Quantities of Reactants and Products 2 Reactants Reactants Products Products C 6 H 12 O 6 (aq) 2 C 2 H 5 OH( l ) + 2 CO 2 (g) glucose ethanol carbon dioxide yeast Conditions may be shown over the arrow. e.g. heat ( ) reflux catalyst present (yeast) Physical states are often listed: (g) gas (s) solid ( l ) liquid (aq) aqueous (dissolved in water) Chemical Equations
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3 O 2 molar mass Balanced equations Balanced equations obey the law of conservation of mass (Lavoisier 1789). 2 C 2 H 6 (g) + 7 O 2 (g) 4 CO 2 (g) + 6 H 2 O( l ) Nanoscale Nanoscale 2 molecules 7 molecules 4 molecules 6 molecules Macroscale 2 moles 7 moles 4 moles 6 moles 2(30.0)= 60.0 g 7(32.0)= 224.0 g 4(44.0)= 176.0 g 6(18.0)= 108.0 g C 2 H 6 molar mass 284.0 g 284.0 g “Mass is neither created nor destroyed in a chemical reaction.” Chemical Equations 4 Stoichiometry Stoichiometry The relationship between the number of reactant and product molecules in a chemical equation. CaCO 3 (s) + 2 HNO 3 (aq) Ca(NO 3 ) 2 (aq) + CO 2 (g) + H 2 O( l ) A stoichiometric coefficient Chemical Equations
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5 Types of reactions 6 Combination Reactions + XZ X Z
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chapter4.part1.forBB.2008 - Chapter 4: Quantities of...

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