Week of 10/19

Monday: Your goal is to figure out which alkali metal it is.  As a group you will write procedures that will both explain the procedures and the calculations behind the procedures.  You will do the lab on Monday and hopefully have enough time to do the calculations. Homework will be to write a conclusion.  Grades will be: Data Collection, Experimental methods (grade based on procedures and evaluation of procedures), and Math.  Notes and lab instructions.

Experimental Methods Math Data Collection and Presentation
 Shows thorough understanding of method, thorough explanation of a detailed plan (procedures, including calculations) as we as thorough evaluation of results.  Demonstrates thorough ability to apply mathematical process and can justify their use. (clearly labeled calculations w/ any assumptions stated, inc. Just and application of s.f. Rules)  Thorough measurement technique, presents data clearly and correctly.
 Less thorough, but competent Demonstrates ability to apply mathematical routines and can sometimes justify their use. Less thorough. (s.f., labeling)
 Lacks justification  Demonstrates ability to apply mathematical processes to solving chemistry problems. Poor technique. (miss. Est. dig, +/-)
Discussion or plan is weak or missing too much. Demonstrates some ability to apply mathematical processes to solving chemistry problems Missing essential information
 No Evidence  No Evidence  No Evidence

So for Methods/Error Analysis make sure you:

  • Calculations
    • Show work/ justify with words as you go along like you did on mixtures lab
    • Justify number of sig figs in final molar mass.
    • Calculate percent error.
      • Sample 1 was Na
      • Sample 2 and 3 were K
  •  Procedures
    •    Say what you are doing (steps),
    •    why you are doing it that way (rationale for choices),
    •    how you will get an answer (calculation), including plan for certain sig figs
  • Error Analysis/Conclusion
    • Limitations of method/equipment/conclusions,
    • discussion of variability (precision…number of decimal places since you don’t have multiple trials) and accuracy (percent error) of the data that is justified
      • State the error
      • Determine whether it was random or systematic and justify this
      • What effect did the error have on the results – in detail. Do math if necessary. Do not just say it would throw off the result. Give an example.

Lab due MONDAY October 26th.

Tuesday: Review for test

Wednesday: Test.  Homework is to work on conclusion (nevermind about videos)

Thursday: Gas laws notes and practice.

Homework:  Make sure you do #5.119 before class tomorrow!

  • Gas laws; 5.39-5.49 (odd only)
  • 57, 59, 73, 117,119 (ideal)
  • 5.63, 67, 69, 71 (molar mass and density)

Friday: Today we are going to start with learning other reactions that produce a gas then do the baggy challenge. Next we will get into kinetic molecular theory including real vs. ideal gases. Here’s the notes.

Homework: finish conclusion and other textbook problems (5.27,28, 33, 142, 21, 22, 23)