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
- Virtual Lab
- Read the experiment description (scroll down a bit past the theory)
- Make a data notebook entry for this.
- For procedures: give reference URL and summarize the process
- What happens? What is measured?
- How is the mass of CO2 used to determine the moles of carbon in the original sample?
- How is the mass of water used to determine the moles of H in the original sample?
- 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?
- 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
- No qualitative observations, uncertainty or error prop required