[pic] December 2007 Teacher ’s Guide About the Guide 3 Student Questions 4 Answers to Student Questions 6 ChemMatters Puzzle: DOUBLE or NOTHING 10 Answers to DOUBLE or NOTHING 11 NSES Correlation 12 Anticipation Guides 14 The Captivating Chemistry of Candles 14 Hindenburg: Formula for Disaster 16 How the Cookie Doesn’t Crumble…and Other Sweet Chemistry Secrets 17 The Solid Facts about Trans Fats 18 Beyond Hydrogen: The New Chemistry of Fuel Cells 19 Content Reading Guides
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micrometers in size. The components of the sample mixture are separated from each other due to their different degrees of interaction with the sorbent particles. The pressurized liquid is typically a mixture of solvents (e.g. water‚ acetonitrile and/or methanol) and is referred to as a "mobile phase". Its composition and temperature plays a major role in the separation process by influencing the interactions taking place between sample components and
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Compound 50‚ like its known analogue 3‚ involves an α‚β-unsaturated ketone‚ an acid-sensitive reactant‚ which prevents its direct synthesis in presence of protic solvents by refluxing. Despite of this characteristic‚ 50 was formed smoothly in 5 minutes by grinding chemistry‚ solely as E-isomer‚ without any evidence of decomposition after 1H and 13C MNR analysis. This synthetic approach provides easy access to such α‚β-unsaturated N-acylhydrazones‚ which are building blocks in the synthesis of nitrogen-containing
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1. Introduction The application of large number of pesticides are used in modern agriculture for control various insect pest population. The varieties and consumption of pesticides have been increasing as increased human population and crop production therefore misuses of pesticides become more and more serious problem as environmental point of view (Sitaramaraju et al. 2014). The increasing amount of crop productivity is not achieved without risk of human health and environment. The repeated application
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High Performance Liquid Chromatography Analysis of Aspirin Problem: Was aspirin (acetylsalicylic acid) successfully synthesized? Are there impurities or by-products present in the synthesized aspirin? How pure is the synthesized aspirin? Introduction: In the last experiment‚ aspirin was synthesized followed by characterization of the product using several different techniques. Melting point was a test that provided information about the identity and purity of the aspirin product. The iron(III)chloride
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Clinically‚ non-steroidal anti-inflammatory drugs (NSAIDs) are the most frequently prescribed class of drugs for inflammatory disorders (1). Lornoxicam is a novel NSAID drug. It has an equipotent COX isoenzyme inhibitory effect and subsequently reduces the production of prostaglandins‚ thromboxane‚ and leukotrienes (2). It is prescribed for mild to moderate pain and inflammation in osteoarthritis and rheumatoid arthritis (3). It is prescribed for the treatment of osteoarthritis due to its analgesic
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conditions based on sharpness of peak and retention time was arrived at by undertaking characterization runs for pure lycopene standard at a given concentration using combination of different columns (BEH2EP‚ BEH1.7‚ C18); mobile phase ratio CO2:methanol/ethanol(80:20‚ 85:15‚ 90:10 – v/v); flow rates (0.5‚1‚1.5 ml/min);active back pressures (1600‚1800 and 2000psi); and column temperatures (35‚45 and 55⁰ C). The system conditions for further validation of its specificity‚ linearity‚ recovery and precision
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formed at the top of the solution‚ so Unknown 2 is insoluable. The Schiff test results were that the solution immediately turned the color magenta signifying that aldehydes are present in Unknown 2. The bisulfite test first required the addition of methanol to make the solution soluble because our unknown was shown to be insoluable from the solubility test results. The bisulfite test results were that a white precipitate formed at the top‚ which signified that aldehydes‚ unhindered cyclic ketones‚ or
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contains more than 4000 chemicals‚ which could have various toxic‚ mutagenic and carcinogenic effects. The content and concentration of chemical ingredients can vary widely from one brand or type of cigarette to the next. Some of these chemicals are Methanol‚ Nicotine‚ Tar‚ and Vinyl Chloride. Just imagine this chemicals goes inside a human body‚ it will surely destroy the body slowly until that person dies. Because the number of smokers in the Philippines is tremendously increasing‚ the government
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I. Results Started with : 40mL acetic acid 4.005g PHPB 2.00g trans-stilbene 1.54g KOH 13mL methanol 21mL ethylene glycerol 2.726g stibene dibromide produced Actual yield : 0.818g diphenlacetylene Melting Point : 62 - 75 degrees Celsius II. Discussion The experimental melting point range of our purified product was 60 degrees Celsius when researched‚ but when done experimentally was only. This began around the right range‚ but ended up being much higher than the literature value
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