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- 1) For a crystalline substance with a hexagonal unit cell, the distance interplanar d is given by the expression. Consider graphite, for which a = 0.247 nm and c = 0.679 nm. On a standardized diffractogram with Cu Kα radiation ((λ = 1.5418 Å)), where angle 2θ will be observed the Bragg 002 peak of graphite?which of the following would have the highest viscosity at a temperature and pressure where all are liquid? Rn, He or Ne?5 if the viscosity of Nacl = 664.256 mpa.s viscosity of NaOH= 1.00979 cp viscosity of water= 0.6531 cp what is the viscosity of the mixture if they are mixed together ?
- When spheres of radius r are packed in a body-centered cubicarrangement, they occupy 68.0% of the available volume. Use thefraction of occupied volume to calculate the value of a, the lengthof the edge of the cube, in terms of r.What amount of energy is required to change a spherical drop of water with a diameter of 2.00 mm to two smaller spherical drops of equal size? The surface tension, γ , of water at room temperature is 72.0 mJ/m2When the temperature is 20 ° C, water flows through an ostwald viscometer at 363 s, whose density and viscosity are given as 0.9982 g / cm3 and 1,000 cP, respectively. The flow time of OF2 from the same viscometer at -145.8 ° C was measured as 68 s. Since the density of OF2 at this temperature is 1.523 g / cm3, what is the value of its viscosity?
- The viscosities of five liquids at 25°C are given in the following table. Explain the observed trends in viscosity.In an x-ray diffraction measurement of BCC Nb, the observed angle (2Θ) for the (211) set of planes occurs at 75.90 degrees (1st order) and a monochromatic x-ray source at λ = 0.1659 nm is used. Compute:a) the interplanar spacing of the (211) set of planes,b) the atomic radius of Nb,c) the anticipated 1st order observed angle (2Θ) for the (111) lattice planes in Nb.d) Estimate the relative intensities observed for the (211) and the (111) diffraction peaks in Nb. Describe your reasoning.In an experiment to determine the surface tension of methanol (ρ = 791 kg m-3 at 298 K) it was found that it rose to a height of 5.8 em in a tube of internal diameter 0.20 mm. What is the surface tension of methanol at 298 K?
- Provide a molecular interpretation for the observation that the viscosity of a gas increases with temperature, whereas the viscosity of a liquid decreases with increasing temperatureA liquid rises to a height of 1.50 cm in a capillary tube. What is the radius of the tube if the density and surface tension of the liquid are 1.80×10³ kg/m³ and 0.135 N/m respectively?Relate viscosity to strength of IMFs among liquid molecules