Alexandra Smith History 111 Dr. White November 16‚ 2012 Alexandra Smith History 111 Dr. White November 16‚ 2012 Response: Esther the Queen If Esther‚ also known as Hadassah‚ lived in our day she would probably say her life changed from that of an ordinary girl to a fairytale Princess. The story of the Bible’s Queen Esther is filled with intrigue‚ romance‚ bravery‚ and honor. It is the story of a Queen who became the savior of her people through a curious mix of
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Preparation of Esters Introduction Esters are known for their pleasant smells such as perfumes and artificial flavorings in contained labs. They are formed when a carboxylic acid reacts with alcohol and a strong acid such as a catalyst called sulfuric acid (H2SO4) for this lab. The structural formula for esters can be represented as R-COO-R’. The R and R’ symbolizes different alkyl groups that can be combined to the ester. When naming an ester the first part comes from the alcohol followed
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Investigative question: how are esters formed ? Esters are formed by the reaction of an alcohol and a carboxylic acid‚ usually in the presence of sulphuric acid to catalyse the process‚ or by the reaction of an acyl chloride with a carboxylic acid (this requires no catalyst and is irreversible without additional reactants) are the most common ways used. Others include reactions of certain molecules such as structural rearrangement. Apparatus: Plastic dropping pipettes‚ Beaker (100 cm3 or 250
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Carbohydrate Polymers 44 (2001) 319–324 www.elsevier.com/locate/carbpol Hydrolysis of diethyl diferulates by a tannase from Aspergillus oryzae ´ M.-T. Garcıa-Conesa a‚*‚ P. Østergaard b‚ S. Kauppinen b‚ G. Williamson a a Phytochemicals Team‚ Division of Diet‚ Health & Consumer Sciences‚ Institute of Food Research‚ Norwich Research Park‚ Colney‚ Norwich NR4 7UA‚ UK. b ´ Screening Biotechnology‚ Enzyme Research Novo Nordisk A/S‚ Novo Alle‚ bldg. 1BM1.05 DK-2880 Bagsvaerd‚ Denmark. Abstract
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Preparation and isolation of an Ester Aim: To make an ester and purify it Background Theory: Esters are derived from carboxylic acids and alcohols with the presence of a catalyst. A carboxylic acid contains the -COOH group‚ and in an ester the hydrogen in this group is replaced by a hydrocarbon group of some kind. Sulfuric acid (H2SO4)is used as a catalyst for this reaction in order to accelerate the rate at which the product is formed. The general formula of an ester is RCOOR’ in which R is the
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The Equilibrium Constant of an Ester Hydrolysis Reaction Julia Stanley CHM 152 LL Dr. Asmita Kane Budruk Goal of the lab: The purpose of this laboratory is to determine the equilibrium constant‚ Kc‚ for the acid-catalyzed reaction between an unknown ester and water to produce an unknown alcohol and an unknown carboxylic acid. I was using Unknown Ester #3 with a density of 0.9342 and Molar Mass of 74.08 g/mol; alcohol with density 0.7914 and Molar Mass 32.04 g/mol. Chemical
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Synthesis of DEET Abstract: For this experiment m-toluic acid was reacted with thionyl chloride resulting in a nucleophilic acyl substitution which could then be used to create DEET with excess diethyl amine (Figure 1). This was done by adding diethyl amine drop wise using a seperatory funnel which resulted in a gas formation which was controlled with a condenser attached to a gas vacuum. The resulting mixture was then washed to remove excess acids and bases and rotovapped. DEET was synthesized
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ESSAY OUTLINE TEMPLATE: “Ester Lucero”! ! INTRODUCTION: ! Who: Angel Sanchez‚ a war vet and doctor.! What? He saved the life of a young girl that he loves‚ Ester Lucero.! When? Sometime after a war.! Where? In a Spanish speaking town and a jungle during the war.! How? He used herbs and a tribal dance that he learned from an Indian during the war.! ! THESIS STATEMENT (What’s the point of your essay?): The settings in which a story takes place help play a big role in understanding the story. We
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[pic] |THE MECHANISM FOR THE ACID CATALYSED HYDROLYSIS OF ESTERS | | | |This page looks in detail at the mechanism for the hydrolysis of esters in the presence of a dilute acid | |(such as hydrochloric acid or sulphuric acid) acting as the catalyst. It uses ethyl ethanoate as a typical| |ester.
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IN-N-OUT BURGER You may be thinking‚ “Hey‚ what’s the big deal about IN-N-OUT that you have to write an article about it? But if that is what you’re thinking‚ then you are likely to have one or more or these great restaurants in your town. However‚ not everybody visiting LasVegas has an IN-N-OUT BURGER back home‚ but they are likely to have heard of this fast food chain. A regional burger chain IN-N-OUT BURGER is not found throughout the Untied States‚ and this is due to several reasons‚ but
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