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- The properties of a molecule that are most frequently calculated are geometry, energy (compared to that of other isomers), and spectra. Why is it more of a challenge to calculate “simple” properties like melting point and density? Hint: is there a difference between a molecule X and the substance X?The now-characteristic model of the atom relies upon the idea that the electrons reside in stable orbits from which they can not deviate and are found outside of a small, densely packed group of protons. This model was created by:What is the maximum number of unpaired delectrons that anatom or ion can possess? Give an example of an atom and an ionthat have this number.
- (a) Calculate the fraction of atom sites that are vacant for copper (Cu) at a temperature of 823°C ( 1096 K). Assume an energy for vacancy formation of 0.90 eV/atom.Enter your answer for part (a) in accordance to the question statement(b) Repeat this calculation at room temperature (298 K).Enter your answer for part (b) in accordance to the question statement(c) What is ratio of Nv/N( 1096 K) and Nv/N (298 K)?Chemistry Please help! These questions are based off determination of calcium concentration & water using Athomic Absoption SpectroscopyThe absorption spectra of solutions containing Br2 are solvent dependent. When elemental bromine is dissolved in nonpolar solvents such as hexane, a single absorption band in the visible spectrum is observed near 500 nm. When Br2 is dissolved in methanol, however, this absorption band shifts and a new band is formed. Account for the appearance of the new band. Is the 500 nm band likely to shift to a longer or shorter wavelength in methanol? Why?
- Why high-resolution monochromator is needed for atomic emission spectroscopy while atomic absorption spectroscopy requires a monochromator having only low-to-moderate resolving power?why is lupac for Hg2Cl2 Mercury (I) Chloride, instead of Mercury (II) Chloride?We have a pink crystals of an ionic compound of an f- block element (M). The crystals house the octahydrate [ M(H2O)8]3+ and an anion which is not chloride and does not luminesce under UV. (A) First, draw and label a plausible solid-state geometry for the hydrated cation. (B)Provide ALL potential identities for the f- block element, M, based on the information supplied above, defending your choices and discussing the applicable chemical concepts. (C)What are the potential solid state MCI3 geometries and coordination numbers for ALL of the components proposed in section (B)? Explain briefly why, focusing on the key chemical principles. (D) In ion - exchange chromatography, which of the trivalent f-block ions indicated in component (B) would you anticipate to elute first? Explain your response, emphasising the important chemical concepts.
- Calculate the number of Frenkel defects per cubic meter in potassium chloride at 500°C. The energy required to form each Frenkel defect is 2.6 eV, whereas the density for KCl is 1.955 g/cm3.a) Determine ground state of Nitrogen, Argon, Titanium, Zinc, Vanadium and represent using spectral notations? b) For 2p level of hydrogen atom En = -3.4eV, find the fine structure splitting?Lead is determined by atomic absorption at 283.3 nm, whereas it is determined at 405.8 nm by flame emission. Explain why the most sensitive line is different for these two methods.