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

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

Hughie’s question- is applesauce a solid or a liquid? 1. Solid 2. Liquid 3. Neither- it’s a gas! Why ask a scientist when you can ask the lunch lady?

Chemical Analysis Used to determine  Composition of mixtures  Last week’s lab  % Sulfur in coal sample  Chemical Formulas

Chemical Analysis Coal deposits contain sulfur in differing amounts S + H 2  H 2 S 1.0g of coal was analyzed and g H 2 S was produced. What was the %S in the coal? %S=grams of S/grams of coal x 100%

Combustion Analysis

Combustion Analysis of Hydrocarbons 3.47g of C x H y F z  What are x, y, and z? 7.51g CO 2 and 3.08g H 2 O produced

What was the empirical formula? 1. CH 6 F 3 2. C 3 H 6 F 3. CH 3 F 4. C 6 H 3 F

Solution Concentration Solution  Solute  Solvent Concentration  Qualitative  Dilute  Concentrated  Quantitative  Molarity=# moles of solute per 1L of solution

Solution Concentration Examples 1. How many grams are in 500mL of a 1.50M solution of NaCl? 2. How many moles are in 27mL of a 1.25M solution of NaOH? 3. How would you make 250mL of 1.00M NH 3 from 15M NH 3 ?