chapter 8 Notes - Chapter8ReactionsandEquations...

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Chapter 8-Reactions and Equations I. Chemical Equations A. What do they represent? 1) Shorthand notation 2) Quantitative relationships 3) Energy changes Question: Sodium metal reacts with water to produce hydrogen gas and sodium hydroxide(a compound that dissolves in water) B. Balancing a Chemical Equation 1) Determine all reactants and products 2) Write word equation Sodium + water ------> hydrogen + sodium hydroxide 3) Write correct formulas and symbols Na + H_20 --------> H_2 + NaOH 4) Balance equation 1 Na 1 Na 2 H 3 H
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1O 1O 2 Na + 2 H_20 ---------> H_2 + 2 NaOH 2 Na 2 Na 4 H 4 H 2 O 2 O This equation is balanced. a. Use coefficients b. Generally no fractional coefficients c. Do not show "1" d. Reduce to lowest common multiple e. Keep subscripts 5. Physical state symbols (s) = solid (l) = liquid (g) = gas (aq) = water solution 2Na(s) + 2H_2O(l) -------> H_2(g) + 2NaOH(aq)
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chapter 8 Notes - Chapter8ReactionsandEquations...

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