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- Which of the following doesnt involve chemical reactions? a.Vanillin-Sulfuric Acid Spray b.Permanganate Staining c.Iodine Chamber d.Ultraviolet Light IlluminationPlease don't provide handwritiin solution...A basic drying agent should not be used to dry an acidic. Which of the following is a basic drying agent? A. Anhydrous calcium chloride B. Anhydrous calcium sulfate (Drierite) C. Anhydrous magnesium sulfate D. Anhydrous potassium or sodium carbonate E. None of the above
- Many operations in the chemical laboratory use “salting out” in the procedure. What do the purpose of this technique?How was the precipitate obtained after filtration? a. By drying the precipitate on the filter paper using a desiccator. b. By charring the filter paper and igniting the product in a crucible. c. By redissolving in hydrochloric acidWhat factor(s) will affect the magnitude of hysteresis of sorption isotherm?I. The nature of food.II. The rate of water removal.III. The amount of water removed during the drying process.IV. The temperature of the drying operation. a.I and II b. I only c. II, III and IV d. All of above
- Which among the following situations favors crystalline precipitate formation? Explain. a. Stirring slowly using reagents at room temp. b. Stirring slowly using reagents at high temp. c. Stirring vigorously using dilute solutions. d. none of the aboveGive and explain two precautions in brine solution experiment.28: (e) figure 13 attached, (f)
- 15. Can provide a protective effect against UV is a quality characteristic of cosmetics on the side…. A. eficacyB. usabilityC. safetyD. stabilityMobile phase is: Select one: O a. Silica gel O b. Liquid phase O c. Solid phase lica gel must not b7. Pay attention to the formula of aloe vera extract lipbalm (Aloe vera.L): Glycerin 5% Cera flava 10% Nipagin 0.18% Lanolin 15% Oleum cacao ad 100% Aloe vera extract 10% The basic ingredients in the formula are.... A. lanolinB. aloe vera extractC. glycerinD. oleum cacao
