Chemistry 11 Lab (Sect 06) Fall 2002
Tuesdays, 1:00 (sharp!) - 4:15, Olin-Rice 343, Instructor: Keith Kuwata
Announcements: (12/9/02) Our final experiment (on 12/10) on pH and buffers is described on this handout; we will not be using Experiment 25 in the lab manual. Please make sure you understand all the problems in the ASA; here is a key. Edward (a.k.a. "Eddo") and I will also be checking folks out of their lab drawers. Be sure to bring your drawer key; you'll be charged a hefty fee ($25!) if you don't turn your key in.
Old announcements are at the bottom of the page.
Required Lab Manual: Slowinski, Wolsey, and Masterton, Chemical Principles in the Laboratory, 7th ed., Fort Worth, Harcourt, 2001.
Section Policies:
Keys for Advance Study Assignments
Exp 11 Exp 4 Exp 12: p. 1 p. 2 Exp 9 Exp 13 MO Lab Alloy Lab Buffer Lab
Keys/Examples for Lab Write-Ups
Exp 4 Exp 12: p. 1 p. 2 Exp 9 Exp 13 MO Lab
Laboratory Handouts (including descriptions of experiments not in the lab manual):
Rules for Significant Figures (10/1/02)
Rules for Lewis Structures and Darling Models (10/8/02)
Visualizing Molecular Orbitals (10/15/02)
Reaction of Al and Zn with HCl (10/29/02)
Experiment 29 Report Instructions (11/5/02)
Equilibrium (11/19/02)
pH and Buffers Lab (in place of Experiment 25) (12/10/02)
Old Announcements:
(10/21/02) (1) I graded your work for Experiment 13, on molecular structure, rather rigorously. Check out the key or come talk with me if you have any questions about this important material. (2) Note that while your ASA for the next lab (Reaction of Al and Zn with HCl) is due by noon on Monday, October 21, we will not do this experiment until Tuesday, October 29. (Check out the ASA Key-revised.) Enjoy your Fall Break week!
(10/7/02) (1) Every team correctly identified its Experiment 12 unknown! However, I did take points off for incomplete data sheets and significant errors in the chemical reactions you were asked to write out. See my key (p. 1 and p. 2) for the reactions. (2) Almost everyone did his or her Experiment 9 calculations perfectly, including significant figures! However, there was significant systematic error in about half of the results. I did not take any points off for bad results, since it is difficult to tell when vaporization is complete. I have scanned in one data sheet with both well-presented calculations and good results.
(11/4/02) Come ready to do either Procedure A.1 or A.2 for Experiment 29 this week. (I will tell you which one you will do at the start of lab.) Note the special instructions for the Experiment 29 report.
Remember that your write-up for the Al/Zn Lab is due at the start of lab. Note that there was an error in the ASA key; here is the corrected version. Here are the instructions I e-mailed you last week:
(1) Include a copy of your preliminary calculations--that is, what you did to figure out sensible masses of Al/Zn and alloy to use.
(2) Present all your raw data.
(3) Present an example of a molar mass calculation for whichever pure metal you chose.
(4) Present an example of a percent Al calculation for your alloy.
(5) Present all final results to the correct number of significant figures.
(6) You will not be penalized if you did only one pure metal trial. (The chemistry faculty realize that when an experiment is more open-ended, you won't be able to collect as much data.)
(7) It is fine to write out your report by hand.
(8) You and your lab partner may turn in one report.
(11/27/02) We will do Part B of Experiment 24 (out of your lab manual) on Tuesday, December 3. Our final week in lab will be action-packed! Our final experiment on pH and buffers is described on this handout; we will not be using Experiment 25 in the lab manual. Edward (a.k.a. "Eddo") and I will also be checking folks out of their lab drawers. In addition, we may have you fill out course evaluation forms. (Alternatively, this may be part of your ASA, due Monday, December 9.)
Last modified 9 Dec 2002