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Unformatted text preview: ORGANIC CHEMISTRY CHE 3238 Mid Term Evaluation-Study Questions 1. List the common detection systems for gas chromatography as well as HPLC. • Normal phase chromatography- the adsorbents used • Reversed-phase Chromatography –the adsorbents used • A common detector for HPLC is UV spectroscopy and refractory index • Common detectors for gas chromatography are (i) Flame Ionization detector (FID) (ii) Thermal conductivity dectorum (TCD) (iii) Mass spectrophotometer (MS) 2. Identify the use of thin Layer Chromatography in organic chemistry. • It allows for rapid separation and quantitative analysis of small amounts of material . 3. Review mixed melting points and the effects on the melting points of each component. • If a solid is impure, the melting point will be lower and the melting range will bigger. • The minimum melting temperature for a mixture of 2 substances is called a eutectic 4. What is the role of activated charcoal in the re-crystallization of an impure solid? The activated charcoal decolorizes. In decolorization, the charcoal removes any colored impurities from the product ....
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