Chemical Reactions and Stoichiometry

Chemical Reactions and Stoichiometry - Exchange Reactions...

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Chemical Reactions and Stoichiometry  15:41 Chemical Equations Reactants  Products Conditions may be shown over the arrow Heat () Reflux Catalyst present (yeast) Physical states are often listed (g) gas (l) liquid (s) solid (aq) aqueous (dissolved in water) Balanced Equations  obey the low of conservation of mass “Mass is neither created nor destroyed in a chemical reaction” Stoichiometry The relationship between the number of reactant and product molecules in a chemical  equation Types of reactions Combination reactions
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Decomposition Reactions Often initiated by heat Occasionally by shock Displacement Reactions Some metals displace another metal from its salt
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Unformatted text preview: Exchange Reactions Balancing Chemical Equations Think of a chemical equation as an assembly line In what ratios do we need parts? 1. Write an unbalanced equation with correct formulas for all substances 2. Balance the atoms of one element. a. Start with the most complex molecule, and elements that appear in only 1 molecule one each side of the arrow b. Change the coefficients in front of the molecules c. Do NOT alter the chemical formula 3. Balance the remaining elements, leaving molecules with only 1 element for last. 4. Check that the atoms are all balanced. The Mole and Chemical Reactions 15:41...
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Chemical Reactions and Stoichiometry - Exchange Reactions...

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