acid Vitamin C is oxidized slowly to dehydroascorbic acid by the oxygen in air. It is catalyzed by ions such as Cu*? and Fe*. The reaction can be followed by measuring the ultraviolet absorbance at 243 nm.

If you had a sample which contained both copper ion and cobalt ion, what wavelength ranges would you expect to show significant absorbance?

3. Regions of the electromagnetic (e/m) spectrum and corresponding molecular processes. (a) Sketch the e/m spectrum like depicted in figure below. For your sketch, use the following units (all together in one plot): wavelength, frequency, wavenumbers, and energy. (b) What are the molecular processes that can be studied by the different types of e/m radiation? Name three (3) processes. (A) Radio waves GOOD (B) (C) (D) Micro- Infrared Visible waves radiation light RESER ш Ultraviolet m X-rays Gamma-rays

Analyze both structures of silica gel and alumina and discuss whether these stationary phases are polar or nonpolar. Justify your answer.