Fresh solvent - eluent Mobile phase Sample components A Celumn packing Stationary phase suspended in a solvent (Mobile phase) Porous disk Flowing mobile phase B elutes A elutes chromatogram
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If the stationary phase used in the given setup is silica, which is more polar? A or B?
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- Homogenous mixture Solution Pure Substance Physical Methods of Separation a) b) c)Proposed a laboratory procedures on how to determine polymer molecular weight based on osmotic pressure and dilute solution viscosity measurements.Calculate the surface excess of solute given the following data:Molar concentration in bulk solution as prepared:0.100 mol dm-3Molar concentration in bulk solution as determined:0.981 mol dm-3Total volume of solution: 100 cm3Radius of beaker containing the solution: 2.50 cm
- 15. Match &write out beside each NMR spectrum the following organic molecules: OH 2 PPM 2.Construct the phase diagram for for gold and thallium. Pure gold melts at 1063°C and pure thallium melt at 302°C, respectively and a eutectic composition between 20 and 30 wt-% Au is found with a melting point of 128°C. (a) Identify the eutectic composition (b) For each region, identify the number of phases and the solid that separates out, if any. (c) Find the composition(s) at ZA = 60 wt-% Au at 400°C! (d) What is the ratio of amounts in the phases for the point in (c)? - (e) For a composition(s) of ZA 20 wt-% Au, heat the sample from the 0°C to 400°C; for each phase transition describe the number of phases, composition of each phase and relative amounts at the start and end point, before and after the phase transition. Composition, wt-% Au 10 20 30 40 60 80 90 Melting T (°C) 272 204 200 400 686 910 998(b) TABLE 3 shows data phase equilibrium diagram for carbon dioxide. TABLE 3 Pressure (atm) Temperature (°C) Triple point Critical point 5.2 -57 73 31 (i) Sketch a phase diagram for carbon dioxide (ii) Explain the phase changes that could possibly occur when a sample of carbon dioxide in a closed vessel under 1 atm pressure and a temperature of -78°C is pressurised isothermally to 10atm, followed by isobaric heating to 20°C.
- 大 立 团 %24 E. %# M 个 Bb Course Content - 2021FA-CHM- X OWLV2 | Online teaching and lea X OWLV2 | Online teaching and lea X Choose the substance with th Ô https://prod01-cnow-owl.cengagenow.com/ilrn/takeAssignment/takeCXPCompliantActivity.do?locator=assignment-take CHAPTER 9 - LIQUIDS, SOLIDS, AND MATERIALS O Previous Page 10 of 17E Next O References Use the References to access important values if needed for this question. Copper has a density of 8.92 g/mL. Calculate the radius of a Cu atom expected if copper crystallizes in the face-centered cubic structure. wd 8 O O 663 pm O 320 pm O 104 pm F2 F3 F4 F5 F7 F8 %24 4. %23 6. 6. 2. 5.(c) The data set below represents the surface tension data for aqueous solutions of 3- methylbutanoic acid [(CH3)2CHCH₂COOH] at 25°C. [C] [mol.dm³] 0 Y[mN.m'] 72.7 0.009 64.6 0.026 59.0 0.065 51.3 0.135 47.0 (i) Calculate the surface excess of 3-methylbutanoic acid (in mol.m2) and (ii) Hence estimate the molecular cross sectional area (in nm²) for this surface active molecule. (iii) Compare your estimate with the molecular cross sectional area one might expect for n-butanoic acid and account for the difference, if any, between the two surface active molecules.Referring to the Al-Si Eutectic diagram discussed on the Phase Diagrams-Lever Rule handout, calculate the mass fraction of the phase, silicon, given a sample with 51.7 wt% aluminum at 576.99 ˚C.
- 3. True or False. a. The relation d In P / dT = AvapH / RT² should not be applied to solid-liquid transitions. b. The relation d In P / dT AvapH / RT² should be applied to liquid-vapor transitions. c. The relation d In P / dT - AvapH / RT² should be applied near the critical point. 4. Some vapor pressures of a certain substance are the following: Temp (°C) Р (Torr) 1227 1327 1427 1527 1627 19.72 48.48 107.2 217.7 408.2 Generate the equation of the best-fit line from a plot of ln P (Torr) vs. 1/T. b. Find the average AvapH over this temperature range. c. Estimate the liquid's normal boiling point. а. 5. The sublimation pressure of CO2 is 138.85 K and 158.75 K is 1.33x10-3 bar and 2.66x10-2 bar, respectively. Estimate the molar enthalpy of sublimation of CO2.The sedimentation coefficient for a protein in solution is determined to be 4.3 S, and the diffusion coefficient to be 5.5x10-11 m2s-1 (vb = 0.74 mLg-1; density = 1.0 gmL-1; and viscosity = 1.0x10-3 Pas-1). Use this information to calculate the molar mass (kgmol-1) of the protein. Assume temperature of 298 K.What is the strength of the ionic interactions between an ion with 1 positive charges and an ion with 2 negative charges, when the distance between them is 32.5 nanometers and the solvent is water, at 25 oC with a dielectric constant of 78.5? Calculate answer to 7 decimal places.specify units in the answer. Thank you very much for your assistance.