2. Suppose in Step 10 of Part A, a student washed the solid aspirin with hot water instead of ice water. How would this influence the percentage yield of the isolated aspirin compared to that obtained if ice water had been used? a. Increase it. Explain your answer: b. Decrease it. c. Would not influence it.
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- 1. Which of the following will give positive test when tested with Fehling’s test? A. formaldehyde B. pentane C. acetone D. pentanone 2. The lengthening of Carbon atoms by means of C bond. A. distillation B. fractional distillation C. condensation D. titration3. Suppose in Step 12 of Part A, a student suspended the synthesized aspirin using hot water instead of ice water. How would this influence the percentage yield of the isolated aspirin compared to that obtained if ice water had been used? a. Increase it. b. Decrease it. Explain your answer: c. Would not influence it.Tom, an analytical chemist, bought a bag of decaffeinated coffee from a grocery store. However,Tom suspected that he might have received regular coffee and therefore decided to analyze hiscoffee for caffeine. In the lab, he took 0.5 mL of the brewed coffee and diluted it in water tomake a 100.0 mL solution. He performed four analyses and found the concentrations to be 4.69,3.99, 4.12, and 4.50 mg/L, respectively. (Assume the density of all solutions is 1.000 g/mL,1oz= 28.35 mL).(a) Report the concentration (in mg/L) of caffeine in the brewed coffee using the format asaverage ± standard deviation. (Note this is not the concentration in the diluted solution.)(b) Look up the caffeine content of regular vs. decaffeinated coffee. Do you think that Tom wasgiven the wrong type of coffee?(c) Caffeine intake of 300 mg per day reportedly has no adverse effects in the vast majority ofthe adult population. If Tom drinks 3 cups (8 oz/cup) of this coffee daily, is his intake withinthis known safe…
- Chemistry H,N. CH, H,N. HO, но Phenylalanine (1) Tyrosine (2) H,C HN CH, H,C `CH, H,C но Triethylamine (4) N-acetyl-OMe-Tyrosine (3) All four compounds are dissolved in ethyl acetate. If you started by extracting the solution with 1 M HCI, which of the following compounds would end up in the aqueous layer? 4 12 Instead, you decide to start by extracting the ethyl acetate solution with 5% NaHCO3 (sodium bicarbonate). What will remain in the organic layer? 1 2 4Which one of the following compounds produces 3 M solution when 1 mole of compound is dissolved in 1 L of solution? A. H2SO3 B. Hg2Br2 C. Ag2SO4 D. Cu2S E. SrCl227. Put a small amount of soap in a test tube and mix the soap well with water. Tap a few drops of the solution on both red and blue litmus paper. You observed that the red litmus paper turned blue and the blue litmus paper did not change. Based on these observations, which of the following is true? (2 Puan) Soap is basic Soap is acidic Soap is neutral
- which undergoes hydrolysis most easily? a. butyl propionate b. butanoyl iodide c. pentanamide d. caproic anhydride which will have a positive result in the addition of lead (II) acetate? a. methionine b. isopropanol c. histidine d. ethyl benzoateTwo students, Ryeo and Wookie, performed the solubility equilibrium experiment. In preparing the second trial at room temperature, Ryeo ran out of distilled water. He then used the stored distilled water from the refrigerator. On the other hand, Wookie was in a rush that he overtitrated his trial. What will happen to the results of their second trials? a. Both Ryeo and Wookie will obtain a higher calculated Kep. O b. Both Ryeo and Wookie will obtain a lower calculated Ksp. O c. Ryeo will obtain a higher calculated Ksp, but Wookie will still get an accurate value. O d. Ryeo will still get an accurate value, but Wookie will obtain a higher calculated Ksp.In Aspirin lab preparation a student used 69.0 g of salicylic acid and 30.0 g of acetic anhydride. Write the general balanced equation and calculate the reaction efficiency, if the pure aspirin was 0.25 mole. Why did you use phosphoric acid in the reaction?
- A student dissolved 4 drops of an unknown compound in 1 mL of methylene chloride (dichloromethane) in a test tube. They added 5 drops of a 2% solution of bromine in dichloromethane dropwise and mixed the contents within the test tube gently. They observed the red-brown color discharges (turns colorless) until the last drop. What compound is most likely the unknown? ©GMU 2020 Oa. Methanol b. Cyclohexane c. n-Butyl Bromide O d. Hex-2-ene COLE QUESTION 6 A student placed 2 drops of an unknown sample in a test tube and added 2 mL of ethanol to the test tube while mixing gently. They added 2 drops of potassium permanganate reagent to the test tube and mixed the contents of the test tube gently. The initial color was a deep purple but then changed to a yellow color which precipitates as a brown solid. What compound is most likely the unknown? OGMU 2020 a. Cyclopentane O b. Cyclohexene c. 1-Pentyl Chloride d. 2-Propanol SOUL QUESTION 7 A student performed the Beilstein test within a chemical…How many milliliters of a 17% w/v concentrate of benzalkonium chloride should be used in preparing 150 mL of a stock solution such that 15 mL. diluted to 1 liter will yield a 1:5000 solution? A. 2 ml. B. 23.5 mL C. 11.75 ml. D. 0.2 mLA. When dissolved in water, trichloroaldehyde (chloral, CCl3CHO) exists primarily as the gem diol, chloral hydrate (aka “knockout drops” or Mickey Finn). Show the structure of chloral hydrate. B. Explain why an aqueous solution of trichlorohydrate is almost all hydrate.