CHEM 203L.001 LAB Quiz-Report Name 1. Give three laboratory usages for Thin-laye

Question

CHEM 203L.001 LAB Quiz-Report Name 1. Give three laboratory usages for Thin-layer chromatography (TLC) a. b. c. 2. Name and give the formula of the compound used as the stationary phase in the TLC experiment. a. Name the solvent that was used to remove benzhydrol from the column in CC. b. Name the solvent that was used to remove naphthalene from the column in 3. Define and give two examples of a. chromophores 4. 5. Why was UV light used in the CC experiment? 6. Draw the Artist's wheel and indicate the various colors in sequential order according to the rainbow a. b. What purpose does the Artist's wheel serve in chemistry? 7. What is (a) a bathochromic shift? What is (b) a hyposochromic shift? What is the relationship between the gap between HOMO and LUMO in a molecule when the - 8. following changes occur: Write I for increase and D for decrease. Increased conjugation Removal ofan auxochrome Removal of a carbonyl group attached to a vinyl group Resonance _ Addition of-N-N-

Explanation / Answer

1)

a)Detection of a Particular Compound Present in a Mixture

b)Determining the Number of Compounds Present in a Mixture

c)Monitoring Reactions. You can monitor the progress and rate of reactions by performing TLC of the reaction samples at particular intervals.

2) Silica(Silicon dioxide) is used as the stationary phase in TLC.The formula is SiO2.

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