Page 1 of 10 5.111 Principles of Chemical Science EXAM # 3 ============================================================================ Write legibly your name and your TA’s name below. Do not open the exam until the start of the exam is announced. The exam is closed notes and closed book. You have 50 minutes (1 academic hour) to complete it. ● Read each part of each problem carefully. ● Write your answers legibly in the corresponding spaces of the attached sheets. ● For problems requiring
Free PH Acid dissociation constant Concentration
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To: Mr. Allan From: Melissa Pihonak Date: 11/06/2014 Subject: Response t006F questions Mr. Allan the following are the answers to the questions that you requested from our firm. Question one What is the average daily bandwidth used? The average daily bandwidth is 175. Bandwidth Mean 175 Question two How many pages were viewed in October? November? December? Question three What is the average stay for each visitor? What is the longest time a visitor stayed at the Web site? What
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Types of Corrosion 1. Discuss the major types of corrosion. Uniform Corrosion: Uniform corrosion is characterized by corrosive attack proceeding evenly over the entire surface area‚ or a large fraction of the total area. General thinning takes place until failure. On the basis of tonnage wasted‚ this is the most important form of corrosion. (corrosion-doctors.org) This reminds me of some of the contractor spec’s I have seen for just this type of corrosion. Many of the clarification mechanisms
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in starting phase CV [m/perc]….cutting velocity (1.1. table) εV‚ ………..experimental data (1.1.table) 1.1. table TOOL WORKPIECE BRASS BRONZ HSS εV 1‚65 2‚23 2‚75 500 N/mm2 Rm=500600 N/mm2 Rm=600800 N/mm2 CV 112 80 28‚7 50 35 20 ALLOY STEEL Rm=300- STEEL 2‚4 CAST IRON-MILD CAST IRON-MIDDLE CAST IRON-HARD 3‚6 42 26 15 m ‚ V60 = V60 ⋅ ξk ⋅ ξ m min ξκ modification factort of setting angle of main edge of tool (1.2. table) ξW modification factor that
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MMB 312 – Test #1_Solution 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
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are two key reasons for using thermoplastic composites: * save time & handling costs in production * eliminate labour-intensive riveting & bonding * can produce large profile sections that are some 20 % lighter than metal & alloys. * materials are exceptionally stiff and can tolerate vibrations A380 (largest passenger plane) - 25 % of the structure & components are composites. And in the next generation of aircraft‚ the content of composites will double. A350
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Corrosion Let metal sit surrounded by oxygen for a while and the metal will corrode. Corrosion is the chemical reaction that takes place when a metal is in contact with oxygen. The metal reacts with the oxygen to form a compound called an oxide on the surface of the metal. The metal becomes tarnished and loses its shine. Metals high in the reactivity series (an observable series of metals‚ in order of reactivity from highest to lowest) corrode more quickly than less reactive metals
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AISI1040 steel (plain carbon steel with 0.4% carbon) is cooled to 728oC‚ which statement is/are INCORRECT: (a) There is 5.05-kg austenite (); (b) There is 4.95-kg ferrite (); (c) There is a 1.25-kg cementite (Fe3C); (d) The alloy is in a three-phase field of Fe3C; (e) The alloy is 100% solid. (3 points) Your Answer: ____________ 6. An ellipsoid with major axes of 2"‚ 3" and 4" is to be die cast in a graphite mold. The mold has a specific weight of 350 lbf/ft3 and outer dimensions of 6" by
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