Week of 9/9/13

Monday: Today we did the green chemistry lab. Kudos to those of you that did the pre-lab in advance! Next year, I will do this differently. I think I will have a person from each group meet with a person from each other group so that you can talk about and compare what each lab report has in it.  Also, I think it would be good if each person presented the method used to calculate the result before you do the pre-lab.   Generally, each group managed to figure out the pre-lab and get the lab accomplished.  It was a good opportunity to get practice with moles and mole ratios in a challenging context, but we definitely could have gotten more out of this experience.

HW: Finish lab, Review mole problems

Tuesday: We did a quick debrief of the green chemistry lab and then reviewed moles a bit.  Rest of class was spent doing book problems listed on unit outline.

HW: Finish lab, finish book problems, watch videos on empirical formula, molecular formula and combustion analysis here.

Wednesday: I presented the story of unit 1 (what I am trying to accomplish/how it all fits together) to give you and idea of what will be on your test.  Then we went over isotopes/weighted atomic average and mass spectrometry.  We didn’t make it much farther than that so we’ll do the planned virtual lab on Thursday, review on Friday and take a short test on Monday.

HW: finish mass spec packet (pg 5-7)finish lab/ work on textbook problems


Empirical formula Simulation Lab

  1. Virtual Lab
    1. Read the experiment description (scroll down a bit past the theory)
    2. Make a data notebook entry for this.
    3. For procedures: give reference URL and summarize the process
      1. What happens? What is measured?
      2. How is the mass of CO2 used to determine the moles of carbon in the original sample?
      3. How is the mass of water used to determine the moles of H in the original sample?
      4. If you know the mass of the carbon and the mass of the H in the original sample, how do you find the mass and moles of the other element in the compound?
    4. Data Collection: Do one random compound that has 3 elements.  (the random option will allow you to see the formulas to check your work)Data Processing Show calculations for empirical and molecular formula
      1. No qualitative observations, uncertainty or error prop required

Friday: Review