Date: September 20‚ 2011 Marks: 50 Question 1 One kilogram of alloy of 70 wt% Pb – 30 wt% Sn is slowly cooled from 300oC See Figure 3 below for the Pb – Sn system. Calculate a) What phases form when the alloy is cooled to 250 oC? [2] b) Determine the weight percent of the phases that form at 250oC. [3] c) The weight percent of the eutectic structure and proeutectic alpha just below the eutectic temperature (183oC) and the weight in kilograms of these phases.
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A single endothermic peak is observed in the temperature range 400 – 550 oC for all investigated compositions. However‚ the relatively large endothermic peaks seen in the DTA thermograms for x=0.17 and x = 0.10 are assigned to α→β and→ transitions respectively‚ while the occurrence of order → disorder(’→) transition is
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Tara Keller Finding the Ratio of Moles of Reactants in a Chemical Reaction 9/6/13 Introduction The purposes of this lab are to measure the temperature change of the reaction between solutions of sodium hydroxide and phosphoric acid‚ calculate the enthalpy‚ H‚ of neutralization of phosphoric acid‚ and compare the calculated enthalpy neutralization with the accepted value. Theory Calorimetry is the measurement of change of heat in a reaction. A calorimeter is a tool to measure the amount of
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“Energy and Efficiency analysis of 210MWe coal base Thermal Power Plant with running parameters” Goutam Khankari‚DVC‚Kolkata. INTRODUCTION Power projects are essentially capital intensive. Not only they involve a highly initial cost which is around Rs. 4.5 to 5.0 crores per MW for coal-based plants but also huge operation cost. The running expenses of a 210MW thermal power station may range around thirty crores every month and usually about 80% of this goes towards the fuel cost. Not only fuel
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Menstrual Disorders. Neuroendocrine Syndromes in Gynecology Menstrual Disorders Menstruation disorders are a common problem during adolescence. These disorders may cause significant anxiety for patients and their families. Physical and psychological factors contribute to the problem. In order to treat menstruation disorders‚ becoming familiar with the normal menstrual cycle is important. The Menstrual Cycle The menstrual cycle is regulated by the complex surge and fluctuations in many different
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acetaminophen/binder from aspirin/caffeine 1.The given tablets were grinded to very fine powder in a mortar. 2.This powder was placed in a conical flask with adding 10cm3 of dichloromethane. 3.The conical flask was put into a beaker of warm water at 30 oC. 4.The solution was filtrated. B. Separation of aspirin and
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There are two sides of everything in life‚ the positive and the negative. Each individual’s personal experience effects them positively‚ negatively or both. Growing up into the work can be challenging for all individuals‚ personal experiences affect us either in a positive or negative way‚ for example feelings of excitement‚ or depression. The book “The story of Tom Breannan” consists of problems young Australians face. Daniel Breannan suffers depression‚ after a car accident‚ which Daniel got behind
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Summary of Chapter 11 Material SN2 Reaction Substrate: NO SN2 ON A TERTIARY HALOALKANE!! order of reactivity is as follows: Methyl > 1 > 2 Sterically less hindered substrates have faster rates in SN2 Nucleophile: If the reacting atom is the same in a series‚ nucleophilicity parallels basicity (i.e. -OH > -OCH3 > -OCH2CH3 > H2O) For the halogens in GAS PHASE: F- > Cl- > Br- > IFor the halogens in SOLUTION: I- > Br- > Cl- > F- (due to solvation of nucleophile‚ rendering it inactive) Negatively
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Planning 1. Turn on spectrometer (and wait to internally calibrate) 2. Zero spectrometer with blank from calibration curve (keep this sample for further runs) 3. Work in teams of 3 4. 1 student on calibration curve 5. 1 student on 25 oC run 6. 1 studnt on 35 oC run. (III) Treatment of Results A) Convert your absorbance readings to nmol p‐nitrophenol/mL. Treatment of Results A) Convert your absorbance readings to nmol p‐nitrophenol/mL. B) Draw a progress curve of nmol p‐nitrophenol/mL against time for each temperature
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DESIGN & SIMULATION OF SOUR GAS TREATMENT PLANT USING SULF INOL & DIPA (A Report on Dissertation II ) Submitted as a part of course work in M. Tech (Gas Engineering) By Prakash Mukhopadhyay‚ B. E (Chemical Engg.) Under the Guidance of Mr. J. S. Prasad‚ Associate Professor UPES - Rajahmundry COLLEGE OF ENGINEERING STUDIES UNIVERSITY OF PETROLEUM AND ENERGY STUDIES Regional Centre: Rajahmundry Andhra Pradesh-533 294 2008-2009 ACKNOWLEDGEMENTS First of all I acknowledge‚ the grace
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