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Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter29: Supercritical Fluid Chromatography And Extraction

Section: Chapter Questions

Problem 29.11QAP

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Discuss glass transition temperature and the factors affecting GTT and what are its significances. Give detailed answer please
10.11/ A 1.5-kg specimen of a 90 wt% Pb-10 wt% Sn alloy is heated to 250°C (480°F), at which temperature it is entirely an a-phase solid solution . The alloy is to be melted to the extent that 50% of the speci- men is liquid, the remainder being the a phase. This may be accomplished either by heating the alloy or changing its composi- tion while holding the temperature con- stant. (a) To what temperature must the speci- men be heated? (b) How much tin must be added to the 1.5-kg specimen at 250°C to achieve this state? 10.15) A magnesium-lead alloy of mass 5.5 ka consists of a solid a phase that has a compo- sition that is just slightly below the solubility limit at 200°C (390°F). (a) What mass of lead is in the alloy? (b) If the alloy is heated to 350°C (660°F). how much more lead may be dissolved in the a phase without exceeding the solubility limit of this phase? 10.27 A hypothetical A-B alloy of composition 55 wt% B-45 wt% A at some temperature is found to consist of mass…
Please answer atleast 4 sub-parts. Thank you.
Stainless steel typically contains 1% carbon, 1-5% manganese, 0.05% phosphorus, 1-3% silicon, 5-10% nickel, and 15-20% chromium. Using a periodic table of elements to determine the pertinent information (e.g. atomic radii, valence, electronegativity, etc) of all the impurities, determine whether each impurity is likely to be substitutional impurity, interstitial impurity, or a second phase particle.
A chemist obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points.
ANSWER ASAP At point B (35 wt% Ni, 1250ºC) on figure, What is the composition of solid and liquid components?
Consider the following series of poly(phenylene oxide) polymers A–D, and their glass transition temperatures. Explain how the differences in structure can account for the differences in Tg
From Elements of CRE by Fogler - 2016
Under what conditions does the extended Debye-Huckel law, equation 8.52, become the Debye-Hckel limiting law?
A sample of steel (0.506 g) was digested in acid and the solution made up to 100 cm3 with deionised water. Aliquots (25.0 cm3) of this solution were transferred into two volumetric flasks (100 cm3) labelled A and B. Flask A was made up to volume with deionised water. To flask B was added 10.0 cm3 of a 260 ppm standard solution of Mn2+ which was then also made up to volume with deionised water. The following absorbance results were obtained: Solution A = 0.356, Solution B = 0.578. Use these results to calculate the percentage (% w/w) of manganese in the steel sample.
A particular liquid crystalline substance has the phasediagram shown in the figure. By analogy with the phasediagram for a nonliquid crystalline substance, identify thephase present in each area.
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