CHEM 512 Addendum for Takehome Test 2, Spring 2008 (25 points) Name_________________

Due Friday April 4, 2008

  1. What uses could DSC (differential scanning calorimetry) be used for in the following industries? ( 5 points)

    1. pharmaceutical industry

    2. thermoplastic polymer production

    3. themoelastomer rubber industry

  2. To what uses can a TGA (thermogravimetric analyzer) be put? What types of experiments can this instruments be used for? (5 points)

  3. What are the advatages and disadvantages to atomic absorption spectroscopy and ion coupled plasma spectrscopy in determing metal concentration. Compare and contrast these two methods. (10 points)

  4. In mass spectrometry, the parent ion is sometimes not stable and not observed in the mass spectrum. Conversely a peak is sometimes observed at half the mass of the molecular ion. Why might these situations occur?

  5. Any nucleus with a non-zero spin can theoretically be used for nuclear magnetic resonance spectra. what are the selection rules to determine whether a nucleus has a half-integral spin (i.e. 1/2, 3/2, 5/2, etc.) or an integral spin (i.e. 1, 2, 3, etc.)?