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Study Resources (Chemistry)

10)In the Stokes–Einstein equation, which describes particle diffusion for a spherical particle, how does the diffusion coefficient depend on fluid viscosity and particle size? 11)Explain the variation of the sedimentation coefficient for DNA as a function of molecular weight, shown in Figure 24.13. .
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44)In deriving the zipper model, the statement was made that if the statistical weight of the hccc configuration were s, then the weight of the hhcc configuration would be s2. Using the relationship between ?G, K, and s, justify this statement mathematically. 45)Determine the statistical weights of the following sequences using.
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36)Determine the standard molar entropy of H35Cl at 298 K where B = 10.58 cm–1, and the ground-state electronic level degeneracy is one. 37)Derive the expression for the standard molar entropy of a monatomic gas restricted to two-dimensional translational motion. (Hint: You are deriving the two-dimensional version of the Sackur–Tetrode.
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29)Chromatin is the complex of DNA and proteins (mostly histones) found in all eukaryotic cells. The fundamental repeating unit of chromatin is the nucleosome particle. The properties of the DNA and the protein in nucleosome particles were determined using a combination of velocity sedimentation, dynamic light scattering, and gel electrophoresis. •Dynamic.
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34)Inspection of the thermodynamic tables in the back of the text reveals that many molecules have quite similar constant volume heat capacities. a.The value of CV,m for Ar(g) at standard temperature and pressure is 12.48 J mol–1 K–1, identical to gaseous He(g). Using statistical mechanics, demonstrate why this equivalence is expected. b.The.
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18)As mentioned in the text, the viscosity of liquids decreases with increasing temperature. The empirical equation ? (T) = AeE/RT provides the relationship between viscosity and temperature for a liquid. In this equation, A and E are constants, with E being referred to as the activation energy for flow. a.How can.
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1)What is the general relationship between the spatial gradient in a system property and the flux of that property? 2)What is the expression for the diffusion coefficient, D, in terms of gas kinetic theory parameters? How is D expected to vary with an increase in molecular mass or collisional cross-section? .
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10)In the early 1990s, fusion involving hydrogen dissolved in palladium at room temperature, or cold fusion, was proposed as a new source of energy. This process relies on the diffusion of H2 into palladium. The diffusion of hydrogen gas through a 0.005-cm-thick piece of palladium foil with a cross-section of.
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7)You are interested in purifying a sample containing the protein alcohol dehydrogenase obtained from horse liver; however, the sample also contains a second protein, catalase. These two proteins have the following transport properties: Catalase Alcohol Dehydrogenase 11.3 ? 10–13 4.88 ? 10–13 D (m2 s–1) 4.1 ? 10–11 6.5 ? 10–11 0.715 0.751 a.Determine the molecular weight of catalase and.
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6)Myoglobin is a protein that participates in oxygen transport. For myoglobin in water at 20°C, D = 11.3 ? 10–11 m2 s–1, and The density of water is 0.998 g cm3 and the viscosity is 1.002 cP at this temperature. a.Using the information provided, estimate the size of myoglobin. b.What.
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48)One of the limitations of the zipper model is that helical segments must be contiguous; however, in longer polypeptides more than one helical segment can be formed. Helix formation in longer polypeptides can be modeled using the Zimm–Bragg model. In this model, the conformational state of the polypeptide is described.
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