bromophenylacetic acid was added to the flask and the mixture was refluxed for about 50 minutes at about 80°C. TLC was used to monitor the reaction progress every 15 minutes. A relatively non-polar solvent system of 25% ethyl acetate/ 75% hexanes was used as the mobile phase. Each plate contained a starting material (4-bromophenylacetic acid)‚ a reaction mixture spot‚ and a co-spot. The TLC at 15 minutes showed the starting material to have an Rf of about 0.12 and reaction mixture lane had only one
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Question No. 1 P: 219 Explain the difference between short run and long run production function; cite one example of this difference in a business situation. The short run production function shows the maximum quantity of a good or service that can be produced by a set of inputs‚ assuming the amount of at least one of the inputs used remains unchanged. While a long run production function shows the maximum quantity of a good or service that can be produced by a set of inputs‚ assuming the
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Few weeks back I got to know that my friend had started drinking and though she is well aware of the consequences of excessive drinking. After connecting with her‚ I wanted to know if alcohol concentration in spirits would affect the cells in the body. Thus‚ I decided to test my theory by adapting a class beetroot experiment to my investigation. The aim of this experiment is to investigate the effect of alcohol concentration on a biotic cell membrane. The human body cannot live long with damaged
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carbohydrate (16 — 24%) total ash content (2.0 — 3. 10%)‚ Moisture (1.68 — 1.82%). The spices are sources of minerals comprising of calcium‚ Iron Zinc‚ Copper‚ Magnesium‚ Sodium and Potassium. phytochemical screening revealed the presence of saponins‚ flavonoids as well as hydrogen upanmides. These bloactive substances may be responsible for the biological properties of the plants. Key words: chemical composition‚ phytochemical screening. Introduction Nigeria is endowed with numerous varieties of useful
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Melting point 1. What two effects do impurities have on the melting point of an organic compound? Soluble impurities affect the melting point of a solid in the following manner. a. The presence of an impurity in the molten compound reduces its vapor pressure thus lowering the melting point of the compound. b. Broaden the melting point range. 2. For what tow purpose are melting points routinely used a. To determine the identity of an organic solid. b. To determine the purity of an organic solid
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Obviously‚some people claim that native bees are not the only pollinator there are other pollinators. In fact‚ 30% of crops are pollinated by only bees . However‚ without bees pollinating many crops would disappear such as fruit‚ vegetable‚ and nuts. If bees disappear that diversity crops would gone after bees(Morse‚2000). “Honey bees are big money makers for U.S. agriculture. These social and hardworking insects produce six hive products honey‚ pollen‚ royal jelly‚ beeswax‚ propolis‚ and venom
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Dr.Tawfeq al.Qaimare Rifqa Shawer Lab report 5 21-3-2013 Adsorption Chromatography Introduction: The technique of adsorption chromatography may be illustrated by a description of how two dyes are separated when a solution of the dyes is passed through a column of powdered silica contained in a vertical glass tube‚ it’s a method used to separate solids or liquids. At the first the two dyes are adsorbed at the top of the column‚ giving this region a nearly dark blue color. However‚ when
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in maintenance of muscle to fat ratio by elevating natural fan burn. However modern life style and its associated stress wreak havoc to cut down on body T level and undermine all of its good efforts. Fortunately Chrysin‚ the Naturally Occurring Flavonoid is able to elevate the body T level. What is Chrysin? Chrysin is a Natural Flavone which is primarily found in passion
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Point 180°C) Rf value (cm/cm) 4.75/4.75=1 Absorbance at 449 nm 0.576 TABLE 3: Summary of Our Beta-carotene Sample Rf value (cm/cm) 4.75/4.75=1 Absorbance 0.186 Beers law determination of percent yield 0.00492 UV-vis spectra value Figure 1: TLC paper Figure 2: Beers law figure and calculations MEMORABLE OBSERVATIONS ANALYSIS Analysis (30): In comparison to last years percentage
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A&P 203- Study Guide (Review) for Practical #2 Blood Vessels 1. Identify Arteries and Veins on checklist on: Torso model Blood vessel Flat board 1/2-size Muscle Figure Arm and Leg models Life size Wall Chart. 2. Slides - Identify artery‚ vein‚ capillary and aorta. - Identify the three tunics (wall layers) in all vessels and the tissue that composes each tunic. Tunica interna (intima)- endothelium (simple squamous epithelium) Tunica media- smooth muscle Tunica externa
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