Name _______________________________________ MIE Introduction to Materials‚ Fall ‘08 Exam #2 Answer all 5 Questions (Please keep your writing neat‚ use full sentences‚ and make the writing large enough so that it can be read.) Problem #1 a) Describe the difference between the substitutional and the interstitial mechanism for mass transport - diffusion in metals. b) Do these two mechanisms control mass transport – diffusion in 1) ceramics and 2) polymers? Explain your answers.
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Paragraph 1: Crystal chemical relationship between quartz (SiO2) and FePO4 The following describes the crystal chemical relationship between quartz (SiO2) and FePO4. At temperatures below 980 K‚ FePO4 exists as alpha- FePO4. Beyond the temperature mark of 980 K (at 980 K or higher)‚ FePO4 exists as beta- FePO4. The geometrical symmetry of single cell of α- FePO4 is trigonal while the geometrical symmetry of β- FePO4 is octahedral structure. At the alpha phase‚ the cell parameters shoots up by a
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5.05 – Rate and Collision Theory Materials: -Water -Alka-Seltzer tablets -Thermometer -2 Small glass cups -Phone (to use as a timer) -2 big class cups Procedure: 1. Using the glass‚ fill it with water that is 25 degrees Celsius‚ use the thermometer to make sure the temperature is correct. 2. Have my phone ready to time how long it takes for the tablet of alka-seltzer to dissolve in the water. 3. Then‚ getting another cup‚ we have room temperature water. Then‚ we drop another alka-seltzer
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Ben Quinones AP Chem Mr. Perry 25 January 2013 Molar Mass by Freezing Point Depression Conclusion: My Lab unsuccessfully found the molar mass of the unknown given to us in the lab. We were tasked with finding the molar mass of an unknown compound using the colligative property of Freezing Point Depression. The way we did this was first finding the temperature at which ice crystals form for just regular BHT. Luckily thanks to our TA we were given temperature probes so we could pinpoint exact
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Agar and Media Preparation— Agar plates containing King’s B Agar were often used throughout the experiment to support growth of Pseduomonas fluorescens. A recipe was used that included a mixture of 10g Proteose Peptone #3‚ 1.5g Potassium Phosphate Dibasic (K2HPO4)‚ 30ml 50% Glycerol‚ ~965ml water and 20g agar. The mixture‚ post- autoclave‚ was left to cool and 5ml 1M Magnesium Sulfate (MgSO4) was added and created about 40 plates. King’s B Medium was made using the same procedure as the King’s B
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5.1 Homework PG178 Questions: 2‚ 3‚ 5‚ 8‚ 9 2. Classify each of the following observations as an example of either a chemical or physical property a. Liquid nitrogen boils at -198˚C This is a physical property because it is a matter of changing state. b. Propane leaking from a damaged tank‚ ignites easily This is a chemical property because it is flammable. c. Silver jewelry tarnishes (darkens) in air This is a chemical property because the silver becomes dark because of oxygen d. Spilled
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Tutorial 1: Atomic Structure and Bonding in Solids 1. (a) Cite the difference between atomic mass and atomic weight. (b) Silicon has three naturally-occurring isotopes as shown in the table below. On the basis of this data‚ confirm that the average atomic weight of Si is 28.0854 amu. |Silicon Isotope |Natural Abundance |Atomic mass of | | | |isotope (amu) | |28Si |92.23 % |27.9769 | |29Si
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Casting Lab 3: Gating Systems and Fluidity Introduction The purpose of the lab was to compare the difference in cross sectional areas‚ sprue size and location in gating systems as well as the totest the influence of the molten aluminum temperature had on the fluidity of the mold. We investigated which areas in the gating system filled‚ the time it took to pour the metal‚ the temperature effects on the fluidity. These tests are important when designing the mold‚ also when choosing which metal
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AP Chemistry Dr. Istone Lab 3: Gravimetric Analysis of a Metal Carbonate Lab Objective: In this lab we will determine the identity of a group 1 metal carbonate compound by gravimetric analysis. The unknown is weighed and dissolved in water and the precipitate is filtered‚ dried‚ and weighed. From the data the formula weight and identity of the unknown metal carbonate is determined. Lab Procedure: 1. Set up the Bunsen burner and ring clamp‚ light the burner and heat the crucible
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The purpose of this experiment was to determine the effects of temperature on the elasticity of rubber bands. There were three hypotheses: If the 0.157 cm rubber bands are heated to about 100˚C in water for one minute‚ then the rubber bands will stretch to approximately 60 cm; If the 0.157 cm rubber bands are cooled to 0˚C in water for one minute‚ then the rubber bands will stretch to approximately 40 cm; If the 0.157 cm rubber bands are left in room temperature water for one minute
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