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- Make a comparative table, highlighting similarities and differences, between the materials: a.polyamides and b. silica gel; used as stationary phases in the technique ofcolumn chromatography. Detail the main characteristics and the most used classesfor each material.Which of the following scaffolds would make a basis for a compound library for screening? Why?Which of the three methods, (Use of Separatory Funnel, Decantation or Use of Pasteur Pipette) do you believe is most suitable for transferring large volumes of liquid mixtures and why?
- Write four features of chemisorptions which are not found in physisorptions. Illustrate your answer with suitable examples.Mass of maleic anhydride used: 5.1296 gram Volume of furan used: 3.25 ml Volume of THF used: approx. 16ml The reaction mixture was allowed to stand undisturbed for one week, whereupon, gem-like, colorless to white, prismatic crystals were isolated from the solvent matrix and allowed to air dry. When dry, the mass of the crystals was determined to be: 4.6732 gram. One small crystal was selected and ground to a fine powder for melting point measurement. The powder was observed to melt at 117 – 118 deg C. About 1ml of a saturated solution of product dissolved in DMSO-d6 was prepared and placed in an NMR tube. Subsequently, proton, carbon-13 and DEPT NMR spectra were acquired. Analysis Write the reaction using structural formulas. Calculate percent yield (show work) What does the measured melting point suggest?Given the attached information, How would I determine the rebate order for hydrogen peroxide?
- estimate the composition of these initial samples of distillate using figure 1. Based on the results what conclusion can you draw regarding the relative efficiencies of the two separations?What error would occur if the Sep-Pak C18 cartridge (the nonpolar stationary phase) was not subjected to prewetting, and why?In the experiment, A=0 is set with a curettes containing pure deionized water. Suggest a reason why an empty cuvette is not satisfactory for this purpose.
- Compound A has a lower affinity for the stationary phase thancompound B and can dissolve well in the mobile phase. In theseparation of the mixture of A and B by column chromatography,which compound will be eluted first from the column? ExplainThe UV–visible spectrum of GLB-1 is given in Figure 2. i.What colour(s) will the deoxy and oxy forms of GLB-1 be? Note, an electromagnetic spectrum is reproduced in the Assessment area on the S315 website. ii.By comparing the bands on the right-hand side (around 550 nm) with those of oxy- and deoxymyoglobin, suggest what type of transition gives rise to these bands.dont provide handwritiing soution ...