Melting Points Elizabeth McGrail Organic Chemistry I 25 January 2013 ABSTRACT The objectives of this lab are‚ as follows; to understand what occurs at the molecular level when a substance melts; to understand the primary purpose of melting point data; to demonstrate the technique for obtaining the melting point of an organic substance; and to explain the effect of impurities on the melting point of a substance. Through the experimentation of three substances‚ tetracosane‚ 1-tetradecanol and
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The Components Of Earth’s Atmosphere And How Our Climate Is Affected By Volcanic Eruptions Introduction The atmosphere is all that lies between us‚ and the vast and unforgiving conditions of space. It absorbs energy from the sun‚ protects us from radiation‚ supports the cycle of water and other chemicals‚ and interacts with Earth’s magnetic fields to give us a climate capable of supporting life. Without it there would be no water‚ no air‚ no life. So we must protect it. But to protect
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adrenoreceptors 1”. Atenolol has the molecular formula of C14H22N2O3. Its molecular mass is 266.3 grams and its IUPAC name is (RS)-4-(2-hydroxy-3-isopropylaminopropoxy) phenylacetamide. Its melting point 152-155 degrees Celsius‚ has a dissociation constant (pKa) of 9.6 at 24 degrees Celsius. It is soluble in water‚ ethanol and methanol but it is insoluble in ether 2.Atenolol can be synthesized in two parts. The first synthesis is with the reaction of phenol and formaldehyde to form the 4-(hydroxymethyl)phenol
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dissimilarity is weather. Ho Chi Minh City’s weather is very hot. Temperature is usually 32-35 degree Celsius. Most houses there have two or three pan‚ which work over day and night. If you come to Ho Chi Minh City the first time‚ you are very difficult to get used to this weather. Contrary to the weather of Ho Chi Minh City‚ DaLat City’s weather is not too hot and not too cool; temperature is 22-25 degree Celsius. Transport is a noticeable difference between Ho Chi Minh City and DaLat City. Traffic lights
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water accessed by people and prevent people from being in contact with toxic water. Ammonia takes the form of gas at room temperature. It is a colourless gas with an irritating odour. Ammonias melting point is at -77 degrees Celsius and its boiling point is at -33.35 degrees Celsius. This covalent compound is corrosive to some metals and is combustible in oxygen. Ammonias structural diagram appears to be polar and therefore is highly stable. Water takes the form of liquid at room temperature. It is colourless
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of benzoic acid to ensure that the apparatus was calibrated. We found that the melting point of benzoic acid was 123 degrees Celsius. After we determined this‚ we were then able to use the Digi-melt apparatus to find the melting point of our unknown solid. After finding the melting point‚ we determined our unknown solid to be Benzoic Acid because of the 123 degree Celsius melting point. We then were able to find the percent recovery to be 17.3% after our crystals were
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EFFECT OF pH LEVEL ON THE ENZYME ACTIVITY OF INVERTASE John Dale Cruz‚ Michael Ray Dela Cruz‚ Karen Angelica Domalaon‚ Abegail Dulay‚ Shirley Ann Felipe Group 5 2C Medical Technology Biochemistry Laboratory ABSTRACT Invertase is a type of enzyme‚ a natural catalytic agent for biochemical reactions‚ can be obtained in Baker’s Yeast. Determination of the effect of pH on invertase activity is the primary objective of the experiment. Dinitrosalicyclic acid (DNS) Assay method is utilized to monitor
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Experiment2: Preparation of Dibenzalacetone Aim: Using the cabon-cabon bond making ability in carbonyl chemistry‚ Dibenzalacetone is synthesized from 2 equivalent of benzaldehyde and 1 equivalent of acetone in a base catalyzed reaction. Physical Data1: *detailed risk and safety phrases are attached. substance Hazards‚ risks and safety practices MW (g/mol) Amt. Used Mol. mp (K) bp (K) density(g/cm^3) acetone R11‚ R36‚ R67‚ S9‚ S25‚ S26 58.08 0.24 g 0.004 178.2 329.4 0.79 benzaldehyde R22
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quantity that is a measure of hotness and coldness on a numerical scale.[1] It is a measure of the thermal energy per particle of matter or radiation; it is measured by a thermometer‚ which may be calibrated in any of various temperature scales‚ Celsius‚ Fahrenheit‚ Kelvin‚ etc. Temperature is an intensive property‚ which means it is independent of the amount of material present; in contrast to energy‚ an extensive property‚ which is proportional to the amount of material in the system. For example
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Homeostasis is a state of equilibrium that tends to be a main goal in many scenarios in living organisms‚ including those within the body. One of which includes the human body temperature which usually is around approximately thirty-seven degrees celsius or ninety-eight and six tenths degrees fahrenheit. This temperature is ideal for the human body because at this temperature it is not too warm as to where the body would have to continually eat and take in nutrients in order to maintain it’s metabolism
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