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Announcements

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

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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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