Lecture_10_013012 - Lecture 10: Chemical Reactions Outline...

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Lecture 10: Chemical Reactions • Outline (Chapter 4.4-4.6): ± Types of Chemical Reactions (4.4) ± Precipitation Reactions (4.5) ± Describing Reactions in Solution (4.6) ± Selective Precipitation (4.7) ± Stoichiometry of Precipitation Reactions (4.8) • Problems for Extra Practice: 4.11, 4.15, 4.17, 4.19, 4.21, 4.23, 4.25, 4.27, 4.29, 4.31, 4.33, 4.35, 4.37
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Midterm Exam #1 Midterm Exam #1, Friday, February 3 rd • Be in your assigned seat no later than 1:25 pm • Bring a calculator, Scantron, #2 pencils and a photo I.D. • Scantron forms must be filled out completely. Any identifying information (name, student number, section letters, and test version) missing or incomplete will result in a 5- point penalty being assessed to your exam score.
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Theoretical, Actual, and Percent Yield Theoretical yield: • the maximum amount of product, which is calculated using the balanced equation. Actual yield: • the amount of product obtained when the reaction takes place Percent yield: • the ratio of actual yield to theoretical yield Percent yield = actual yield (g) x 100 theoretical yield (g)
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Percent Yield - Example Acetylene, C 2 H 2 , used in welder’s torches, burns in oxygen to produce carbon dioxide and water. If 62.0 g of carbon dioxide are produced when 22.5 g of C 2 H 2 react with sufficient oxygen, what is the percent yield for the reaction?
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Percent Yield - Example The fertilizer ammonium sulfate, (NH 4 ) 2 SO 4 , is prepared by the reaction between ammonia (NH 3 ) and sulfuric acid (H 2 SO 4 ): 2NH 3 (g) + H 2 SO 4 (aq) b (NH 4 ) 2 SO 4 (aq) If the yield of ammonium sulfate production is 75.5%, what mass of ammonia must be reacted to form 562 g of ammonium sulfate?
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Chapter 4: Types of Chemical Reactions and Solution Stoichiometry 4.1 Water, the Common Solvent
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Lecture_10_013012 - Lecture 10: Chemical Reactions Outline...

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