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CHAPTER+3 - 1 Chemical Reactions Law of Conservation of...

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1 Chemical Reactions Law of Conservation of Mass ) Atoms neither created nor destroyed Stoichiometry ) Quantitative relationships between reactants and/or product of a reaction Chemical Equations ) Need a balanced equation for calculations 2 Chemical Equations Reactants on left; Products on right ) A + B C + D , A reacts with B to yield C and D Balance equations with coefficients ) 2H 2 + O 2 2H 2 O ) do not change subscripts to balance equations 3 Combustion of Methane
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4 Symbols of Physical States 2K(s) + 2H 2 O(l) 2KOH(aq) + H 2 (g) ) (s) solid ) (l) liquid ) (aq) aqueous solution ) (g) gas GAS GIVEN OFF AS PRODUCT SOLID FORMED AS PRODUCT HEAT REQUIRED FOR REACTION 5 Practice Balancing Equations Equation C 3 H 8 + O 2 CO 2 + H 2 O Step 1 C 3 H 8 + O 2 3CO 2 + 4H 2 O Step 2 C 3 H 8 + 5O 2 3CO 2 + 4H 2 O Step 3 may need to use fractional coefficient such as 5/2 Step 4 multiply equation by 2(or some other number) to make all coefficients whole numbers 6 Classification of Chemical Reactions Combustion Combination ) 2Mg + O 2 2MgO Decomposition ) CaCO 3 CaO + CO 2 Metathesis Oxidation-Reduction
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7 Reactions with Oxygen Movie 8 Equations for Demonstration Mg + O 2 MgO 2Mg + O
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