3 Calculate (a) the optical purity of a mixture of 3.5 g ()- menthol and 2.7 g (+) - menthol. (b) What is the observed rotation of the mixture if the specific rotation of (-) - menthol is -48°.
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- 1. Is coconut oil soluble or insoluble in water? Why? 2. Is coconut oil soluble or insoluble in ethanol? Why? 3. Is coconut oil soluble or insoluble in chlorofomr? Why? 4. Is coconut oil soluble or insoluble in ether? Why?What enables a radioisotope to substitute for an ordinary (nonradioactive) atom of the same element molecule?6. Using a balance with a sensitivity of 4 mg, an acceptable weighing error of 5% and cherry syrup as the solvent for tartar emetic, how could you obtain the correct quantity of tartar emetic to fill the prescription?
- 2- How much solution (in ml) of silver nitrate at a molar concentration of 0,0540 mol/l is needed as to receive 200 ml of the solution with desired titrimetric conversion factor of silver nitrate (М=169,863 g/mol) corresponding sodium chloride (М=58,443 g/mol) to be equal to 1,810 ∙10-3 g/ml? Express numerical result with an accuracy of: Х,ХExplain how you would prepare 100ml of 10mMProline solution given that the molecular mass of proline= 115.13 g/mol1.The specific rotation of a sample of mandelic acid [PhCH(OH)CO2H] is -9.48° and of pure S-(-)- mandelic acid is -158°. Calculate the (1) % optical purity, (2) ee, (3) % composition and (4) draw a clear stereo-structure for S-(-)-mandelic acid. 2. Explain each of the following concepts: a)positional isomerism b) Newman projection formula c) Chemoselectivity 3. use the molecular formula C4H8O2 to illustrate the following isomers: a) (+)-gauche and antiperiplanar b) chain isomer c) Enantiomer d) Cis-and Trans cycloalkanes
- Compare the densities of low-density polyethylene (LDPE) and high-density poly- ethylene (HDPE) with the densities of the liquid alkanes.How might you account for the differences between them?What microscopic methods would be suitable for studying (a) the morphology of crystalline polymers, (b) surface oxidation in a hydrocarbon polymer, (c) the structure of the beads used in a GPC column, (d) suspected gel particles in branched polyethylene (e) How may x-ray diffraction data be used to estimate the sizes of polymer crystallites?1. The adsorbance is silica coated magnetite 2. what impact does the 7.85 point of zero charge have on my adsorbate? 3. Does it(7.85) enhance the performance of the adsorbate in any way?
- If I have a 20ml stock solution of BSA with a BSA concentration of 0.2%. How can I make two other 20ml solutions with 97% and 75% the concentration of the stock solution, using the stock solution and two other graduated cylinders?..Besides 1H NMR, FT-IR, melting point, data for refractive index, what other information could you obtain for your compound to assess its’ purity and confirm its’ structure? How would this additional data contribute to your conclusion about the structure of the unknown compound?pH 3.5 4.5 5.5 6.5 7.5 8.5 Absorbance 0.098 0.027 0.068 0.028 0.032 0.054 Concentration in diluted supernatant (mg/ml) 0.196 0.054 0.136 0.0056 0.0064 0.0108 Concentration in undiluted supernatant (mg/ml) 0.98 0.27 0.68 0.28 0.32 0.54 Formula for the amount (g) of soluble proteins in the soy flour extract: In 15 ml of soy flour extract (with 1/50 dilution), Soluble protein (g) = (C x V x F) / 1000 C = concentration (mg/ml); F = dilution factor; V = volume of solution (ml) Calculate the % solubility of protein in the soy flour (Assume the soy flour contains 35% protein (w/w))