Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Si crystalizes into a diamond crystal structure with lattice constant a = 0.543\: nma=0.543nm. Calculate the atomic density in units of cm^{-3}cm−3. Values within 5% error will be considered correct.
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- 1) a) A solid substance is considered to be orthorhombic in nature. Since the edges of the unit cell are a = 3.50Å, b = 4.0 Å, c = 5.5 Å, calculate the d and 2θ positions for the 111 plane expected in the diffraction pattern as a result of CuKα radiation (λ = 1.54 Å). b) What is the Miller index of the plane intersecting the crystal axes (2a, 1b, -3c)?arrow_forward1: What is the molar concentration of a 4% solution of borax? (sodium tetraborate decahydrate, Na2B4O7·10H2O) Group of answer choices A:1.5 x 10^4 M B:65.8 M C:1.049 M D:0.1049 M 2: Calculate the approximate length of PVA strand assuming that each monomer unit contributes two carbon atom diameters to the length. (1 carbon atom diameter = 154 picometers) Group of answer choices A:5.46 x 10^7 nm B:5.46 m C:308 pm D:5.46 x 10^5 pm 3: Calculate and compare the number of strands of PVA in 1.00 L of 4% PVA and the number of tetrahydroxyborate ions in 1.00 L a 4% solution of borax. Group of answer choices A:Borax has more strands than PVA B:Borax has approx. 409 more ions than PVA strands C:PVA has approx. 409 more strands than Borax ions D:Borax has approx. 209 more ions than PVA strandsarrow_forwarda) It is considered that a solid substance has an orthorhombic structure. Since the edges of the unit cell are a = 3.50Å, b = 4.0 Å, c = 5.5 Å, calculate the d and 2θ positions for the 111 plane expected in the diffraction pattern as a result of CuKα radiation (λ = 1.54 Å). b) What is the Miller index of the plane intersecting the crystal axes (2a, 1b, -3c)?arrow_forward
- A first order reflection from the (123) planes of a cubic crystal was observed at an angle of e = 24.8 ° when X-rays of wavelength 154 pm were used. 1 h k? 1? d u? b? na = 2d sin e -= - hki (i) Determine the length of the side of the unit cell.arrow_forwardFive grams of catalyst adsorb 400cm3 of nitrogen to form a monolayer. What is the surface area if the area occupied by a molecule of N2 is 16A°.arrow_forwardDistinguish between Chemiluminescence and Triboluminescence and give an example of each.arrow_forward
- 12. (3) How does a nucleus for a semi-crystalline polymer form crystalline nuclei, and how do they grow? 13. (3) Two semi-crystalline polymers with the same composition but with molecular weights that differ by a 5 are cooled to produce the same microstructure. Which will be stronger, which will be tougher, and whyarrow_forwardDescribe the differences between a nanopowder image characterized by scanning electron microscopy and characterized by optical microscopy.arrow_forward50.00 mL of a solution containing 0.15 M CH2 (CO2 H)2 and 0.020 M MnSO4·H2O Calculate the mass of manganous sulfate monohydrate required (manganese sulfate is available only in the monohydrate form, MnSO4H2O, which means that within every MnSO4 unit cell, there is one water molecule present; the mass of the water must therefore be included in the calculation).arrow_forward
- Five grams of a catalyst adsorb 400 cm3 of N2 at STP to form a monolayer. What is the surface area per gram if the area occupied by a molecule of N2 is 16 Å^2arrow_forwardExplain why a dispersion of silver nanoparticles coated with an amine functionalised polymer would be more stable at low pH than high pH.arrow_forward3. Find lattice constant and atomic radius of Silver from the X-Ray spectra for Silver nanoparticles given below and compare with appendix (wavelength of incident X-Ray is 0.154 nm ) 40 (111) 35 30 25 20 (200) 15 (311) (220) 10 |(222) 5 10 30 2 Theta 50 70 90 Fig. 3. X-ray diffraction patterns of silver nanoparticles embedded ultra-thin film solar cell.arrow_forward
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