It is ‘thiazolidine-2‚4-dione’ and not thiohydantoins as the reaction product of monosubstituted thioureas and chloroacetylchloride a a a a a The reaction products of monosubstituted phenylthioureas with chloroacetylchloride in a polyethylene glycol (PEG-400) medium and K2 CO3 as base/catalyst at an elevated temperature are exclusively thiazolidine-2‚4-diones and not thiohydantoins as has been reported. The core unit thiazolidine-2‚4-dione is essentially derived from chloroacetylchloride
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Page 1 of 10 5.111 Principles of Chemical Science EXAM # 3 ============================================================================ Write legibly your name and your TA’s name below. Do not open the exam until the start of the exam is announced. The exam is closed notes and closed book. You have 50 minutes (1 academic hour) to complete it. ● Read each part of each problem carefully. ● Write your answers legibly in the corresponding spaces of the attached sheets. ● For problems requiring
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Chapters 1‚ 2 and 5 [pages 99-104] Notes from The Allyn & Bacon Guide to Writing Closed-form writing consists of • An explicit thesis in the introduction that informs readers of the point of the entire essay • Unified and coherent paragraphs • Sustained development of that thesis without digressions Open-form prose consists of • No reduction to a single‚ summarizable thesis • The use of story or narrative as an organizing principle through which a point emerges
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Aristotle was a famous Greek philosopher and scientist that lived from 384 to 322 BC. He is ranked with Socrates and Plato to be one of the most famous philosophers. Aristotle was born at Stagira‚ in Macedonia‚ as the son of a physician to the royal court. At the age of 17‚ he went to Athens to study at Plato’s Academy. He remained there for about 20 years‚ as a student and then as a teacher. When Plato dies in 347 BC‚ Aristotle moved to Assos‚ where a friend of his‚ Hermais was ruler.There he
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Thomas Jefferson had a certain curiosity about the vast region west of the Mississippi. He wanted to know all about the geography and how well the prospects were for trade and agriculture. In 1803‚ Congress approved his proposal to finance for a mapping and scientific expedition to the far Northwest‚ beyond the Mississippi‚ which was foreign territory. In May‚ 1804‚ Jefferson assigned as commanders‚ Meriwether Lewis his personal secretary and William Clark‚ to set out on an amazing expedition across
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Mendel used to conduct his very famous hereditary experiments in his free time. He did something no one had ever done before and no one ever had analyzed statistically the experiments of breeding. It was Mendel’s knowledge of natural sciences and his studies that helped him carry out these experiments. He usually chose to work with pea plants and selected only those ones that were cultivated in controlled atmosphere and were a pure variety. He cross bred many seeds and then found out results of the
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William the Conqueror was a Norman duke who later became an English king. He had many great accomplishments. His most well-known accomplishments are the idea of feudalism and the Domesday Book. The Normans were a fierce group who were very militaristic. William the Conqueror was born around 1027 in Normandy. He was the illegitimate son of the former Duke of Normandy. Because his parents‚ Duke Robert I and Herleve‚ were not married‚ he was nicknamed William the Bastard. At the age of 8‚ he became
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Research for Kinetics Coursework http://www.google.co.uk/#sclient=psy-ab&hl=en&rlz=1R2ADRA_enGB386&source=hp&q=An+investigation+into+the+kinetics+of+the+reaction+between+potassium+peroxodisulphate+and+potassium+Iodide&pbx=1&oq=An+investigation+into+the+kinetics+of+the+reaction+between+potassium+peroxodisulphate+and+potassium+Iodide&aq=f&aqi=&aql=1&gs_sm=e&gs_upl=4649l5023l3l5663l2l0l0l0l0l0l0l0ll0l0&rlz=1R2ADRA_enGB386&bav=on.2‚or.r_gc.r_pw.&fp=4cbda8eccdfde5e1&biw=1280&bih=600 http://www.chemistry-react
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TITLE: THE EFFECT OF HEATING DIFFERENT SUBSTANCES INTRODUCTION: In this exercise‚ it was required to observe carefully what happened when certain substances were heated in a burner‚ and to note the appearance of the residue after heating. AIM: To observe the effects of heating different substances. MATERIALS: Hard glass test tubes Powered samples of Lead (II) nitrate Copper (II) sulphate Ammonium chloride Zinc sulphate Basic copper (II) carbonate‚ CuCO3. Cu(OH)2
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Name‚ Date‚ Hour Lesson Objective: Key Vocabulary: Lesson pH and dilutions Science Starter: Determine the pH of .0103M H3PO4 solution in water. Remember to look at the H+ count. Box 1 In a dilution‚ the number of solute particles does not change‚ just the concentration with respect to the volume. This relationship is _____________________ proportional. Initially‚ there is 275mL 0.125M stock solution of a substance. -Determine the amount of moles of solute present. -What is the concentration
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