Sedimentary Rocks Dead Horse Point‚ Utah Dr. R. B. Schultz What are sedimentary rocks and what do they represent? Sedimentary rocks are those that represent the material record of environments in the form of rock layers or strata that once existed on earth. There are two (2) types of sedimentary rocks‚ based on their textures: Clastic (also called “Detrital”)-- form from deposition of solid grains; classified based on grain size: conglomerate‚ sandstone‚ and shale Chemical -- form from
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Grignard Reaction: Synthesis of Triphenylmethanol Hai Liu TA: Ara Austin Mondays: 11:30-2:20 Abstract: In this experiment‚ phenylmagnesium bromide‚ a Grignard reagent was synthesized from bromobenzene and magnesium strips in a diethyl ether solvent. The Grignard reagent was then converted to triphenylmethanol‚ a tertiary alcohol with HCl. The reaction for phenylmagnesium bromide was: The reaction for Grignard to triphenylmethanol was: In the formation of the Grignard reagent
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electrophile is positively charged nucleophile is negatively charged Nitrogen and Oxygen with lone pairs are GREAT nucleophiles even better when charged) * Purify the Product * What purification technique will be used? 1. Recrystallization- Purify a crystal. Find a solvent that dissolves the crystals when boiling‚ and recrystallizes when cool. (The same solvent should not dissolve it when cold). A crystal is extremely organized‚
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have been investigating the synthesis of Aspirin and checking for presence and purity of Aspirin. Throughout this coursework we have looked at the history of Aspirin; industrial manufacturing; making salicylic acid; the preparation of Aspirin; recrystallization and purity; melting point; thin layer chromatography (TLC) and titration of Aspirin. I’ve learned a lot about Aspirin‚ how it works and how it is made. We found out that the Aspirin we made and used was actually very pure when we tested it out
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Abstract: The purpose of this lab is to synthesise acetylsalicylic acid (aspirin) by creating a reaction between acetic anhydride and salicylic acid. This was be accomplished through the use of recrystallization. Acetic anhydride and salicylic acid are mixed together‚ and then acidified by the addition of a few drops of concentrated sulfuric acid‚ which catalyzed the reaction. The percent yield is calculated to determine the effectiveness of the reaction in preparing the desired product (aspirin)
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represents 0.33% of the original mass of the two yolks. The cholesterol was then dissolved in ether and further purified by bromination with a bromine/acetic acid reagent and debromination with zinc powder‚ a series of aqueous washes‚ and a final recrystallization from methanol. Here‚ a yield of 28% was recovered from an initial mass of 100 mg of recrystallized material. The melting point of the off-white crystalline final product was 146-148 oC‚ which is very close to the literature value for cholesterol
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Introduction Table of Contents Introduction Materials Chemicals Equipment Safety Containers Measuring Devices Other Equipment Procedure Synthesis of Aspirin Crystalizing the Aspirin Recrystallizing the Crude Aspirin Finding the Melting Point Range Safety Precautions Acetic Anhydride Sulphuric and Salicylic Acid Heating Observations Mass of Aspirin Synthesized Melting Point Calculations Percentage Yield Maximum Yield Crude Product Final Product Melting Range Percentage
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sum up‚ As Cold rolling is a metalworking process it increases the strength and hardness of metal‚ such as Brass ‚ Copper and Aluminium in this experiment. A metal sheet or bar is passed through rollers at a controlled weight well under its recrystallization temperature‚ which is usually at room temperature. Although the cold rolling process increases the metal’s strength and hardness it will also decrease its ductility‚ which will result in a metal that is more prone to cracks and fractures.
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saturated solution. Then the solution was covered by a perforated sheet and kept separately for slow evaporation without any disturbance at room temperature. The crystal growth condition was optimized and grown crystals were purified by successive recrystallization process. Due to the spontaneous nucleation‚ colorless single crystals were obtained in a period of 15 - 20 days. Figure 2 shows the photograph of as grown single crystal of MPN. The theoretical Bravais‚ Friedel‚ Connay and Harker (BFDH) morphological
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Engineering Materials Week 4 7.2 Consider two edge dislocations of opposite sign and having slip planes that are separated by several atomic distances. Briefly describe the defect that results when these two dislocations become aligned with each other. When the two edge dislocations become aligned‚ a planar region of vacancies will exist between the dislocations. 7.12 Consider a metal single crystal oriented such that normal to the slip plane and the slip direction are at angles 60 and 35 with the
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