tetraphenylcyclopentadienone Overall Synthesis: CHEMICALS: wk 1: thiamine hydrochloride (1 g/student)‚ 95% ethanol (8 mls/ student)‚ 2M NaOH (5 mls/student)‚ benzaldehyde (4 mls/student) wk 2: 95% ethanol (30 mls/student) wk 3: acetic acid (6 mls/student)‚ ammonium nitrate (1 g/student)‚ 0.1g/ml cupric acetate (1.5 mls/student)‚ dichloromethane (6 mls/ student)‚ 30% acetone in heptanes (3 mls/student)‚ 95% ethanol (20 mls/student) wk 4: 1‚3 diphenylacetone (0.5 g/student)‚ triethylene glycol (5 mls/student)
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Hi guys‚ my name is Betty. I am the lead of my group today. I am goanna talk about fuel prices. The issue of fuel is very complex. First‚ what is fuel? It is material such as coal‚ gas‚ or oil that is burned to produce heat or power. And these 3 energies occupy the major parts of fuel use. In the past few years‚ fuel prices went up rapidly. Each country is very sensitive on the price. What causes fuel prices to rise and fall? For instance‚ let us have a look at oil. There are two main reasons
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similar formula and chemical properties‚ and increase in molecular size and mass. When the equations for combustion of these alcohols are listed in the order of increasing number of carbon atoms‚ Methanol 1 CH3OH(l) + 3/2 O2(g) ⋄ 1 CO2(g) + 2 H2O(l) Ethanol 1 C2H5OH(l) + 3 O2(g) ⋄ 2 CO2(g) + 3 H2O(l) Propanol 1 C3H7OH(l) + 9/2 O2(g) ⋄ 3 CO2(g) + 4 H2O(l) Butanol 1 C4H9OH(l) + 6 O2(g) ⋄ 4 CO2(g) + 5 H2O(l) Pentanol 1 C5H11OH(l) + 15/2 O2(g) ⋄ 5 CO2(g) + 6 H2O(l) The number of CO2 molecule increases
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Tetraethoxysilane (TEOS‚ 99%)‚ chloropropyltriethoxysilane (CPTES‚ 99%)‚ absolute ethanol (EtOH‚ 99%) and other chemicals were purchased from Merck and Sigma Aldrich companies and used without further purification. Ciprofloxacin was purchased from Pars Daru Company. Preparation of modified magnetic silica NPs (Fe3O4@SiO2~Cl) Initially‚ the magnetic NPs prepared through a coprecipitation method and coated with a silica layer via a modified sol-gel method [20]. In brief‚ FeCl3.6H2O (0.036 mol) and
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Alcohol Should Be Banned By: ******* An alcoholic beverage is a drink that contains ethanol. Alcoholic beverages are separated into three types: beers‚ wines‚ and spirits. Alcohol is a substance that a lot of people‚ mostly of age and people underage drink to "forget about their troubles or problems". People drink because they like it when it makes them feel on cloud 9‚ to feel at bliss. Alcohol is just a waste of time‚ money and patience. Drinking alcohol only makes you feel like you’re in
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oxidising agents such as KMnO₄‚ Na₂Cr₂O₇ and H₂CrO₄ can be used. The reaction between alcohols and carboxylic acids will produce esters. Apparatus: Stopper‚ dropper‚ test tube‚ stopwatch‚ water bath‚ measuring cylinder (10ml) Chemical Reagents: Ethanol‚ n-Butanol‚ 2-Butanol‚ Alcohol X‚ Lucas reagent‚ 2-methyl-2-propanol‚ Concentrated H₂SO₄‚ 0.04 M Na₂Cr₂O₇‚ Glacial acetic acid Procedure (a) Lucas
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proteins is typically achieved by digestion with proteinase K‚ followed by salting-out‚ organic extraction‚ or binding of the DNA to a solid phase support (either anion-exchange or silica technology). DNA is usually recovered by precipitation using ethanol or isopropanol. The choice of a method depends on many factors.The required quantity and molecular weight of the DNA‚ the purity required for downstream applications‚ and the time and expense.The separation of DNA from cellular components can be divided
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condensing and collecting the alcohol rich vapours released‚ as a high alcohol strength liquid (spirit). The starting material for most distillations‚ such as wine for brandy and beer for whisky‚ are usually weak alcoholic solutions (5%-7% v/v ethanol) This seems counter intuitive‚ as it would seem that if the desired product is alcohol‚ the starting solution should have a high alcohol concentration. The reason for starting with a relatively low alcohol starting material is that alcohol
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5-tetraphenylcyclopentadienone: A solution of 4 capsules potassium hydroxide (0.5g) and 5mL anhydrous ethanol was prepared and warmed in a 25mL beaker. Benzil (2.1542g) ‚ dibenzyl ketone (1.9599g) ‚ 15mL anhydrous methanol‚ and a boiling stone was placed into a 50mL round-bottomed flask and fit with a reflux condenser and then gently heated. The temperature was raise nearly to the boiling point‚ and the solution of potassium hydroxide and anhydrous ethanol was added in two portions through the top of the condenser. The mixture
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Assemble and label six clean‚ dry test tubes. To each add a different alkyl halide (0.1 mL). (Again‚ to follow the rates‚ it may be easier to react only four test tubes at a time.) To each test tube add 1 mL of a 0.1 M solution of AgNO3 in ethanol and mix thoroughly. (Avoid skin contact! Silver salts + skin -> long-lived brown stain). For each tube‚ note how long after the
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