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Announcements

Results for Exam #1 are out! Deadline for Combustion Analysis Module extended. First set of Chapter 4 Homework posted today. Chemical analysis methods used to determine mixture composition and chemical formulas. Combustion analysis examples provided. Solution concentration concepts explained with practical examples. Get ready for your chemistry studies!

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Announcements

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  1. Announcements EXAM #1 RESULTS OWL: DEADLINE FOR COMBUSTION ANALYSIS MODULE EXTENDED; FIRST SET OF CHAPTER 4 HOMEWORK POSTED THIS AFTERNOON

  2. Hughie’s question- is applesauce a solid or a liquid? • Solid • Liquid • Neither- it’s a gas! Why ask a scientist when you can ask the lunch lady? 0

  3. Chemical Analysis • Used to determine • Composition of mixtures • Last week’s lab • % Sulfur in coal sample • Chemical Formulas

  4. Chemical Analysis • Coal deposits contain sulfur in differing amounts S + H2 H2S • 1.0g of coal was analyzed and 0.0130g H2S was produced. What was the %S in the coal? %S=grams of S/grams of coal x 100%

  5. Combustion Analysis

  6. Combustion Analysis of Hydrocarbons • 3.47g of CxHyFz What are x, y, and z? 7.51g CO2 and 3.08g H2O produced

  7. What was the empirical formula? • CH6F3 • C3H6F • CH3F • C6H3F 10

  8. Solution Concentration • Solution • Solute • Solvent • Concentration • Qualitative • Dilute • Concentrated • Quantitative • Molarity=# moles of solute per 1L of solution

  9. Solution Concentration Examples • How many grams are in 500mL of a 1.50M solution of NaCl? • How many moles are in 27mL of a 1.25M solution of NaOH? • How would you make 250mL of 1.00M NH3 from 15M NH3?

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