Use the simulation to estimate how many times higher the melting temperature is of the substance with the strongest possible attractive interactions in the simulation than the melting temperature of the substance with the weakest possible attractive interactions. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a The melting temperatures are the same b The melting temperature is approximately 2 times higher The melting temperature is approximately 5 times higher The melting temperature is approximately 10 times higher

Use the simulation to estimate how many times higher the melting temperature is of the substance with the strongest possible attractive interactions in the simulation than the melting temperature of the substance with the weakest possible attractive interactions. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a The melting temperatures are the same b The melting temperature is approximately 2 times higher The melting temperature is approximately 5 times higher The melting temperature is approximately 10 times higher

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter22: Inorganic Materials

Section: Chapter Questions

Problem 7P

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I am given a sample of an unknown metal X. The density of the metal is 8.90g/cm3. X-ray diffraction studies determine that the packaging of the metal is face centered cubic, and they also measure the radius of X to be 128pm. Find the identity of X.
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3.Why is slow cooling required to produce pure crystals?
Platinum nanoparticles of diameter ∼2 nm are importantcatalysts in carbon monoxide oxidation to carbondioxide. Platinum crystallizes in a face-centered cubicarrangement with an edge length of 3.924 Å. (a) Estimatehow many platinum atoms would fit into a 2.0-nmsphere; the volume of a sphere is (4/3)π r3. Recall that1 A° = 1 x 10-10 m and 1 nm = 1 x 10-9 m. (b) Estimatehow many platinum atoms are on the surface of a 2.0-nmPt sphere, using the surface area of a sphere (4π r2) andassuming that the “footprint” of one Pt atom can be estimatedfrom its atomic diameter of 2.8 A° . (c) Using yourresults from (a) and (b), calculate the percentage of Pt atomsthat are on the surface of a 2.0-nm nanoparticle. (d)Repeat these calculations for a 5.0-nm platinum nanoparticle.(e) Which size of nanoparticle would you expect tobe more catalytically active and why?
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Figure below shows the first four peaks of the x - ray diffraction pattern for copper, which has a face centered cubic crystal structure: monochromatic X - radiation having a wavelength of 0.1542 nm was used. Reflection indices are presented in the table below. The whole number of wavelengths equals one; (a) Index (t.e., give h, k, and / indices) for each of these peaks. (b) Determine the interplanar spacing for each of the peaks. (c) For each peak, determine the atomic radius for Cu Intensity (relative) 40.0 50.0 80.0 90.0 60.0 70.0 Diffraction angle 20 Crystal Structure BCC Reflections Present (h + k + I) even Reflection Indices for First Sir Planes 110, 2010), 211, 220, 310, 222 111 200, 220, 311, 222, 400 100, 110, 111, 200, 210, 211 FCC h, k, and I either all odd or all even Simple cubic All
Based on the volumes calculated in the previous question and the picture below, calculate the edge length, a, of the body-centered cubic cell, in pm, for each met Volumes: Cr - 2.28 x 10^-29m^3 Mo - 3.17 x 10^-29m^3 W - 3.15 x 10^-29m^3
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Comparing two FCC metals, one with melting temperature of 857 ºC and one with melting temperature = 1284 ºC, which would you expect to have a larger fraction of vacant sites (Nv/N) at a temperature one degree below their respective melting points? Write down answer in about 4 sentences, and include all relevant quantities to make your point.

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