• No Self-Test for today.
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  • Stacey found an error in PS4.9, there are several references to different elements in this problem. The actual (and this is the correct element) element is magnesium, NOT calcium or cerium. The problem is correctly worded as;
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    Magnesium, which is found in “epsom salts” has six known isotopes, three of which contribute 99.99% of the mass of any given sample. The table below lists the atomic mass and fractional abundance of the three important isotopes of cerium.

    Atomic Mass (u)

    Fractional Abundance

    23.98504

    0.7870

    24.98584

    0.1013

    25.98259

    0.1117

    Calculate the average atomic weight of magnesium.

    Does this agree with the value in the periodic table? Why?

  • In PS4.2 the temperature 23.5.0 C should be 23.5 C.
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  • Laboratory this week is Solubility in Water. You are going test the solubility of a bunch of interesting compounds, and based on your observations generate some conclusions about the behavior of certain substances. It will be interesting.
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  • No Self-Test today. Look for one on Wednesday.
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  • Remember we agreed to postpone PS#4 to Friday, February 11, 2000.
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  • Exam scores are now available at the Grades link.
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  • I need some volunteers to attend a seminar on Monday, February 7, 2000 at 3:45 pm in PS103. A candidate for the Coordinator of General Chemistry will be giving a 20 minute seminar on the topic of water at a level appropriate for introductory chemistry students. If you can attend see me in class or send me an e-mail. Thank you.
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  • If you do not know the answer to any of the self-test questions an acceptable response is 'I do not know' (IDK).
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  • PLEASE! I will not accept any late problem sets. If your PS is not turned in at the beginning of class it is late! If you turn your PS into the Chemistry Office it is late and you will receive a 0 for that problem set. It is a fairness issue. If everyone turns in the PS on time I can not allow other students extra time to complete their PS. If it is late you have taken extra time. If anyone has any problem with this policy please e-mail me.
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  • If you can not make class (for whatever reason) when a Problem Set is due I will accept it if you mail it and the postmark is the day the problem set is due or earlier. You are also welcome to FAX (405-744-6007), but that can be expensive.
  • Need a periodic table? Check the Database link. I recommend the WebElements Periodic Table.
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  • The Chemistry Department offers free tutoring in PS023. For a tentative schedule go to the Free Tutoring link. The tutoring will begin Monday, January 17, 2000. Names in red are our TA's and they will know more about what is happening in our class. TA names in blue have taught 1215 with me before.
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  • Welcome to CHEM 1215. In order to post grade information (scores on problem sets, laboratory's and exams) I need your permission. Go the SID#/Name link and enter a number, name or combination unique to you. I will post grade information using your SID# or SIDName. There are some additional questions that I would like you to answer for some EXTRA CREDIT.
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  • Our teaching assistants this semester are James Greuel (401, 403 and 405), Dattatri Negesha (402, 404 and 406), and Joe Studer (407, 408 and 409).
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