Thin Layer Chromatography Quiz by pptfiles

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									Thin Layer Chromatography Quiz

1.

The retention factor, Rf, is: a. b. c. d. distance traveled by the solvent divided by distance traveled by the compound distance traveled by the compound divided by distance traveled by the solvent distance traveled by the fastest compound divided by distance traveled by the slowest compound distance traveled by the slowest compound divided by distance traveled by the fastest compound

2.

In today’s experiment, plates will be visualized using: a. b. c. d. UV light and bromine vapors Bromine vapors and iodine vapors UV light only UV light and iodine vapors

3.

In TLC, separation results from a. b. c. differences in the rates at which the compounds in a mixture react with the adsorbent differences in the rates at which the compounds in a mixture react with the eluting solvent differences in the rates at which the compounds in a mixture advance up the plate, based on their characteristic solubility and adsorptivity properties none of the above

d. 4.

In today’s TLC experiment, the stationary phase is: a. b. c. d. silica gel ethyl acetate and acetic acid the capillary tube all of the above

5.

The more polar the substance: a. b. c. d. the farther it travels up the plate the slower it travels up the plate the greater the chance it will fall off the plate and smash to the floor none of the above

6.

“Spotting” refers to a. b. c. d. an unwanted creation of Dalmatians during a chemical reaction the application of a compound or mixture to a TLC plate using a microcapillary tube the application of very small Dalmations to a TLC plate using a microcapillary tube an unwanted distribution of compounds on a TLC plate based on solubilities that are incompatible with the plate

7.

To develop a TLC plate, a chemist: a. b. c. d. places it in a jar with solvent places it in an oven to dry it places it under a UV lamp places it among iodine crystals


								
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