NEWS PAGE

 

1. CHEM 101---------Please read along in your textbook and practice working problems as the information is completed in lecture. We will be covering material in chapters 1 and 2.

Chapter 2 - Example 2.8-2.11, 2.18- 2.25, 2.27, Questions 1, 5, 15, Problems 31, 33, 35, 45, 51, 57, 61, 69, 75
Chapter 3 - Example 3.1, 3.3
Chapter 4 - Example 4.7, 4.12
Chapter 6 - Example 6.1 - 6.4, 6.10, 6.11, 6.12, 6.13

New practice problems have been assigned:

Chapter 5 - Example 5.5 - 5.9, 5.20, 5.23, 5.25

Chapter 7 - Example 7.1, 7.2, 7.4, 7.5

Chapter 8 - Example 8.1 - 8.6, 8.9, 8.10 (Test 1 after completion)

2. CLAB 124-------Please be prepared for experiment 3. You should read the introductory material and the procedure in your lab manual (or modification if applicable). Be sure to prepare an outline (summary) of the procedure in your notebook. Remember to bring your lab manual and notebook to class and wear proper lab attire. Please also bring a calculator (does not need to be scientific). Please study the link on the class web page for Common Laboratory Operations and Apparatus.

Your lab reports for experiment 2 will be due. Please read Part II of the Information Sheet before starting the report. Remember that all calculations are to include units and are to be to the proper number of significant digits. Multiple pages must be stapled.

Raw data will include the mass of copper (II) sulfate pentahydrate, volumes of the volumetric flasks, and volumes delivered with the pipette.
Sample calcs. will include the stock solution and dilution for solution 1. Also show the calculation of the concentration of the unknown using the equation from the linear regression..
Results include the graph with table of values and the concentration of the unknown with unknown letter.
Discussion should include comments on the correlation coefficient and any errors etc.

Lab report experiment 3 instructions.

Raw data: Table for part A to include fp of water, fp of each solution mass of each solute, mass of water for each solution.
Table for part B with fp of each soultion, mass of water, mass of HOAC each solution.

Sample Calc: A-Calculate molality of each solution, calculate fp depression each solution
B- Calculate for run 1, total molality and apparent molar mass
Table I from lab manual with your numbers to proper number of significant figures
Excel graph with table of values
% error calculation

Results: A- molalities and fp depression for sucorse and potassium nitrate
B- Extrapolated value of molar mass from intercept, 5 error

Discussion: A- compare fp depression for the two solutes- one should be twice the other
B- discuss % error and R squared value