A technique used in observing trace elements, isotopes and atomic monolayers based on the secondary ions that are ejected from the sample. O XRD O AFM SEM O SIMS O XPS ONLO ELLIPSOMETRY
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- Explain how to obtain larger particles based on the relative supersaturationIron nanoparticles were produced by the evaporation method and their average sizes are estimated 25,50, 90 and 120 nm using the laser particle analyzer. Assuming that the resultant particles are strain freeand the peak broadening detected in the measurement with Cu-K radiation (λ=0.154 nm) arises onlyfrom variation of size of the crystallites, estimate the peak width (the value of FWHM) of the (110) plane.A device to understand how iron behaves at high temperatureswe want to design. This device (with 1% accuracy) allows the change in volume (heating) of a 1cm 3 iron cube.the resulting polymorphic transformation) must be able to feel. HMK structure in iron 911 0 C and latticeparameter 0.2863 nm. At 913 0 C, it has YMK structure and its lattice parameter is 0.3591 nm. Of measuring instrumentDetermine the accuracy tolerance it needs (i.e. at least how many cm 3 to detect a changemust). It is necessary to use at least 6 digits after the comma in this question. Hint: YMK first andFor HMK, the volume of an atom is found and then, using the number of atoms in each structure, the ironThe question can be started by finding the different volumes.
- Six iron tablets containing FeSO4.7H2O were dissolved in 100-ml of 0.1M HNO3 with gentle heating. All of the Fe2+ is converted to Fe3+ by the strong oxidizing conditions. After the solution had cooled to room temperature , 2.5-ml of 35wt% NH4OH was added. The precipitate Fe2O3-xH2O that was filtered weighed 0.345g. Thermogravimetric analysis of the crude product showed a 10.5% weight loss . A. How many waters of hydration were in the precipitate B. How much iron is present in each tabletIn a vacuum chamber filled with argon gas at 100 mTorr, a plasma is ignited resulting to 1% ionization. This is already a "hot plasma" by lab processing standards. Calculate the number density of plasma electrons (should be about the same as the argon ion density due to quasineutrality) in this 1% ionized plasma.You and a partner are asked to complete a lab entitled“Oxides of Ruthenium” that is scheduled to extend over twolab periods. The first lab, which is to be completed by yourpartner, is devoted to carrying out compositional analysis.In the second lab, you are to determine melting points. Upongoing to lab you find two unlabeled vials, one containinga soft yellow substance and the other a black powder. Youalso find the following notes in your partner’s notebook—Compound 1: 76.0% Ru and 24.0% O (by mass), Compound2: 61.2% Ru and 38.8% O (by mass). (a) What is the empiricalformula for Compound 1? (b) What is the empiricalformula for Compound 2? Upon determining the meltingpoints of these two compounds, you find that the yellowcompound melts at 25 °C, while the black powder does notmelt up to the maximum temperature of your apparatus,1200 °C. (c) What is the identity of the yellow compound?(d) What is the identity of the black compound? (e) Whichcompound is molecular? (f) Which compound is…
- You are given three unknown samples stored in screw-cappedcontainers and was told to analyse them. You noted that Container A iscloudy and have some particles that are staying near the bottom of thecontainer. Container B is translucent while Container C is transparent. If thecontents of Container A can be separated by simple decantation,what isthe particle size that BEST describes its composition?i. <1 nmii. 1 nmiii. 1 nm-100 nmiv. >1000 nmWe 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.. List and discuss in your understanding the three factors that the interaction volume depends on when the sample/specimen interacts with the electrons.
- Do not give handwriting solution Using 0.901 g/cm3 for density of tri - isopropylsilanol (i-C3H7)3SiOH and assuming spherical shape of the molecule, determine its molecular cross section and the maximal grafting density for these molecules supported on a flat silica surface.Give some of the application of Coloumetry, Potentiometey, Electrogravimetry and Voltammetry in different fields.Which of the following is/are characteristic of silica as stationary phase in chromatography? O It has higher sample capacity. O It has wider range of most useful forms. O It is polar. O All of the above