•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 2 3

54%

1%

45%

1. Solid2. Liquid3. 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 + 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%

Combustion Analysis

Combustion Analysis of Hydrocarbons

3.47g of CxHyFz What are x, y, and z?7.51g CO2 and 3.08g H2O produced

What was the empirical formula?

1. CH6F3

2. C3H6F

3. CH3F

4. C6H3F

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 NH3 from 15M NH3?