Physical Properties of Organic Molecules Abstract Identifying the physical properties of compounds can be useful in several ways. It helps us to determine the structure of certain compounds‚ the purity of substances and if a substance is not pure we can figure out how to separate contaminating substances from a compound. In this experiment‚ I learned how to determine a solid’s melting point and why some melting point ranges may be broader than others.
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Briefing Thin-layer chromatography (TLC) is an extremely valuable analytical technique. It provides a rapid separation of compounds‚ and gives an indication of the number and nature of the components of a mixture. TLC can also be used to identify compounds by comparison with known samples‚ to check the purity of a compound‚ or to monitor the progress of a reaction‚ an extraction‚ or a purification procedure. This experiment will introduce you to the mechanics of TLC‚ and the chemical principles
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CHEM. RES. CHINESE UNIVERSITIES 2012‚ 28(3)‚ 415—418 Determination of Nicotine in Tobacco by Capillary Electrophoresis with Electrochemical Detection SUN Jin-ying1‚ XU Xiao-yu1‚2‚ YU Huan1 and YOU Tian-yan1* 1. State Key Laboratory of Electroanalytical Chemistry‚ Changchun Institute of Applied Chemistry‚ Chinese Academy of Sciences‚ Changchun 130022‚ P. R. China; 2. Ministry of Public Security of Jilin Province‚ Changchun 130051‚ P. R. China Abstract A sensitive‚ simple and low-cost method based
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Banana (Musa spp.) is one of the most produced and widely consumed by worldwide market; and was originally descendent from hot and tropical region in South East Asia. For over 200 species were discovered which contributes to various cultivar with different types of characteristics and appearances tagged along the traits (Salunke‚ 1984). Banana came from family Musaceae genus and scientifically named as Musa paradisiacal L. In Malaysia‚ the diversity of banana can be proofed by the cultivars of diploid
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Organic Chemistry II Lab Diels Alder Reaction Purpose: In this experiment a Diels-Alder reaction was used to form the products. Cyclopentadiene and maleic anhydride were reacted together to form cis-Norbornene-5‚6-endo-dicarboxylic anhydride. 7-oxabicyclo{2.2.1}hept-5-ene-2‚3-dicarboxylic anhydride was also produced through a Diels-Alder reaction with the combination of furan and maleic anhydride. Equation: Procedure: Part 1 In a flask equipped with
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attached. substance Hazards‚ risks and safety practices MW (g/mol) Amt. Used Mol. mp (K) bp (K) density(g/cm^3) acetone R11‚ R36‚ R67‚ S9‚ S25‚ S26 58.08 0.24 g 0.004 178.2 329.4 0.79 benzaldehyde R22‚ S24 106.13 0.82 g 0.008 247 451.1 1.0415 ehtyl acetate R11‚ R36‚ R66‚ R67‚ S16‚ S26‚ S33 88.11 2 ml per gram n/a 189.55 350.25 0.897 NaOH R35‚S22‚ S26‚ S38‚ S45‚ S62‚ s24/25 39.997 0.4 g 0.01 591 1663 2.1 Ethanol R11‚ S2‚ S7‚ S16 46.07 2 ml n/a 158.8 351.6 0.789 Dibenzalacetone n/a 234 g/mol n/a n/a
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defense mechanism against attack by other microbes‚ which rely on sterols as part of their biochemical make up. Initially‚ researchers looked for organisms with the ability to inhibit the incorporation of carbon-14 acetate into lipids. Broths that acted as inhibitors between acetate and lipid were then tested to see whether they would inhibit the production of lipids from tritium-labeled mevalonate. Broths which inhibited carbon-14 assimilation‚ but not lipid
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“HAWK BAG” What is the selling style of the salesperson? As soon as I reached the stall of Hawk Bags in SM Cubao‚ their sales representative approached and greeted us with a genuine smile on the face. He first asked my need‚ if I was looking for a bag for laptop or for a daily use. Undecided I was still to choose a specific bag‚ the salesman spoke of the quality of the Hawk bags. When he noticed that I was quite more interested with backpacks for women since I moved on that side of the stall
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the most commonly used drugs because it has adverse impacts on human’s health through how it’s metabolized. Alcohol is a compound of hydrogen‚ carbon and oxygen‚ which can be combined in many different ways. The commonest as known as ethyl ethanol‚ which is a specific alcohol compound (C2H5OH) and formed from the fermentation of yeast‚ sugars and starches. This alcoholic formation also releases carbon dioxide (Simon‚ Reece‚ Dickey 2010‚ p.103). The compounds of alcohols are structurally
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Retention Factor values confirmed that the unknown most closely matched acetaminophen. Referring to Table 15.1 of Lehman’s Experiment 15‚ acetaminophen is found in both Excedrin and Tylenol.(1) Discussion: Filled a beaker with about 5mL ethyl acetate/acetic acid (200:1) to use as a
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