to become brittle with ageing. Unmodified starch is too much hydrophilic to be used as food packaging material. Chemical modification must be carried out in order to make them hydrophobic. These modifications are grafting‚ alkylation-especially esterification including acetylation. The purpose of the project is to prepare acetylated starches/starch esters of different Degree of Substitution using different concentrations of acetic anhydride for modifying the native starch. The testing of samples is
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CLASSIFICATION TESTS A. Acids There are relatively few suitable tests for carboxylic acids. Classification is based mostly upon solubility tests. If the compound is water soluble‚ test the aqueous solution of your compound with pH paper (also check the pH of the original water). If the compound is water-insoluble and it dissolves in 5% (1.5M) sodium hydroxide and 5% NaHCO3 solutions as performed in your solubility tests‚ it can be classified as a carboxylic acid. Establish an equivalence value
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Reminder: These notes are meant to supplement‚ not replace‚ the laboratory manual. A Diels-Alder Reaction History and Application: The 1950 Nobel prize in chemistry was awarded to Otto Paul Hermann Diels and Kurt Alder for their breakthrough work on the discovery and development of [4 + 2] cycloaddition reactions i. This set of reactions are enormously useful in the synthesis of six membered rings in a single stepii. These are used in many pharmaceutical applications. Tamiflu® is a drug which
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Experimental Synthesis of Aspirin and Melting Point Purity Analysis Donald Yeargin CH 222‚ Section 24221 Department of Chemistry Portland Community College Portland‚ OR Abstract The various methods available to synthesize aspirin lead to the need to examine and evaluate production efficiency and purity. The purpose of our experiment was to synthesize acetyl salicylic acid (aspirin) and then determine the relative purity of the synthesized sample by observing the melting point temperature
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Unit 4: Solutions and Solubility Lesson 13 Key Questions: 42. a) Cloudy pond water – Heterogenous‚ light cannot pass though‚ can see different parts. b) Apple Juice – Solution‚ organic apple particles(solute)‚ and water(solvent). c) Rainwater – Solution‚ CO2‚ hydrogen(solute)‚ and water(solvent). d) 14-karat gold in jewelry – Heterogenous‚ light cannot pass through. Just because light can’t pass through‚ doesn’t mean it’s not a solution! Gold is a solid solution – it is different metals
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well as spotting the standard spinach extract. A beaker was used with the developing solvent‚ filter paper‚ and TLC plate inside and a watch glass over top of the beaker to perform the thin layer chromatography. After the solvent front (30% ethyl acetate in hexane) reached about an inch from the top‚ the TLC plate was removed from the beaker and the developing spots were marked. After implementing the column and thin layer chromatography‚ the Rf value for component one was .95‚ for component two it
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Session 9: The Nervous System - Assignment #2 PhysioEx Assignment : Exercise 3 Neurophysiology of Nerve Impulses Activity 1: The Resting Membrane Potential 1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. Increasing the extracellular K+ causes the membrane potential to change to a less negative value because when K+ ions diffuse out across the membrane they are leaving behind a net negative charge. 2. Explain
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The column fractions were collected in 25 ml test tubes. In that‚ fraction number 271-275th showed identical clear spot which were loaded on the activated silica gel TLC plates (20 cm × 20 cm). The plates were developed using methanol: ethyl acetate (60:40) solvent system. The single spot was located by exposing the plate to iodine fumes. Thus‚ it may indicate the presence of single
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INTRODUCTION – NEED FOR BIO-FUELS The recent upheavals in the oil market leading to record oil prices‚ have again turned the world attention to alternative sources of energy. A number of them are being researched Nuclear energy‚ Hydrogen energy‚ Wind energy‚ Solar energy & Bio-energy. Use of nuclear energy and hydrogen energy for civilian purposes are in very nascent stages. Fuel cells are more promising‚ but they are yet to be put in commercial practice. Wind energy and solar energy
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Unanswered QuestionsNew AnswersQ&A CategoriesCouponsGuidesSign In|Sign Up Home Search Settings Top Contributors Help Center Home Answers.com > Wiki Answers > Categories > Entertainment & Arts > Celebrities > Are Lindsay Lohan and Sean Fox Zastoupil still together? Are Lindsay Lohan and Sean Fox Zastoupil still together? In: Celebrities‚ Actors & Actresses‚ Lindsay Lohan [Edit categories] Want to Be on Jessie?www.interfacetalentgroup.com InterFACE Connects You To Agents & Castings. Sign
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