(c) The figure below shows the measured osmotic pressure, II / c, against the mass concentrationc of the polymer for polymer solutions A, B, C, and D. The temperature and solvent are constant. D П B A (i) Rank the polymers according to their molar mass. (ii) In which polymer solution is the quality of the solvent the poorest? What type of solvent is present in sample C? Explain your answer.
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- (b) Explain what hydrogels are as a group of material. Discuss and illustrate with examples the most important properties of hydrogels.Define the following terms: a. solvation sphere b. amphipathic c. micelle d. hydrophobic effect e. clathrateIndicate the contrast statements of the following chromatographic techniques of separation. A. A separation of components mixture based on migration rates in a stationary phase by a gaseous or liquid mobile phase. B. The supported materials coated of flat plate or in fibres of paper stationary phase is known as planar chromatography. C. The rate of migration of molecules or analytes is depending on the relative solubility of the solute in the stationary phase and mobile phase. D. Involve an electronic transition of valence shell electron in free atoms to provide analytical information about sample composition.
- Which representation(s) show polymer structures that are likely to result in rigid, hard materials and those that are likely to result in flexible, stretchable, soft materials? A B D E F CI- G H I(Please draw) Illustrate the intermolecular forces expected to be found in an oil-water interface Illustrate the intermolecular forces expected to be found in an oil-water+albumin interface(b) Define the melting temperature (Tm) of a polymer and describe a method that could be used to distinguish between Tg and Tm. Include a sketch of the expected results of the method chosen.
- Match the following terms:___Solute (a) A mixture of two or more substances___Mixture in which the molecules of the sub-___Solution stances are evenly distributed___Solvent (b) The medium in which substances are dissolved (c) The substance dissolved in the solvent (d) Two or more substances that combine in any proportion and are not chemi- cally boundThe standard curve to determine the amount of betacyanin is shown below. You extracted a red pigment from a beet disc (the mass of a disc is 2 g) using 10 ml of 20% ethanol solution. You measured absorbance of the solution above the beet disc every minute for a total time of 20 minutes. The increase in absorbance was linear during a period of time from 1 min to 10 min. The absorbance at 10 min was 0.8. Calculate the amount of betacyanin extracted from 1g of a beet tissue per minute. Explain your calculations. You can use Excel or a calculator.What would you expect to see if you were to create a solution that has 20.0 grams of the NaCl and the solubility is 35.0 g in 100 mL? What type of solution is this? Format B I U ... >
- A mixture of lipids containing phosphatidic acid, cholesterol, testosterone, and phosphatidylcholine was applied to a hydrophobic interaction chromatography column. The column was then washed with increasingly nonpolar solvents. IWhat order would the lipids be eluted from the column?At what pH does a lysine solution exhibit the highest buffering capacity? (Lysine pKas: pk1 = 2.2, pK2 = 8.95, pK3 = 10.5) %3D O рH 12.1 О рH 9.72 O pH 5.67 pH 8.95What is the chemistry principle behind when (treatment: heavy cream) is subjected to CHILLED TEMPERATURE? What is the effect in beating time, stability (%drain) and volume foam (specific gravity) is important? see the data below Treatment (Heavy Cream) Beating Time (min) Stability (%drain) Volume of Foam (Specific Gravity) (Room Temperature) 20 No drain 0.94 Heavy Cream (chilled) 20 No drain 0.76 Heavy Cream with sugar and vanilla 20 No drain 0.88 Heavy Cream (over-whipped) 25 No drain 0.83