14. The beginning of a melting point range is when , and the end is when a. you

Question

14. The beginning of a melting point range is when , and the end is when a. you first observe liquid......all of the solid has liquefied b. you first observe liquid,.......all of the solid has boiled off c. you first observe the crystals 'softening d, all of the solid in the capillary tube has liquefied, nm all of the solid has boiled off all of the solid has liquefied 15. The amount of each component in a mixture can be determined from the gas chromatography results by using a the retention time of each peak b. the area under each peak c. the height of each peak d. the width of each peak 16. Which of the following is not an example of a common drying agent? a. magnesium sulfate b. sodium sulfate c. silver nitrate d. calcium chloride 17. The best way to determine if two solid samples with very close melting points are the same compound is: a. calibrate the thermometer b. repeat the measurements heating the samples more slowly c. double check your observed melting points on a second apparatus d. mix the two samples together and record the mixed melting point 18. During refractive index, which of the following shows the most likely path of a photon of light as it enters a sample of liquid from the atmosphere? atmosphere igui d. D c. b. B a. A 19. Which of the following is not a desirable property for a satisfactory extraction solvent? a. It should readily dissolve the substance to be extracted. b. It should not react with the solute. c. It should not be flammable d. It should be miscible with water.

Explanation / Answer

Ans 14 a) You first observe liquid ,......all of the solid has liquiefied

The amorphous solids generally do not have a fixed melting point , so when the liquid appears first , it marks the start of melting range and when all the solid has boiled off , it marks the end of the range.

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