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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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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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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In the low tide zone and the mid tide zone the temperatures can vary. In the low tide the temperatures usually vary from 8-17 degrees Celsius and in the mid tide zone the temperature can vary from 14-21 degrees Celsius. If the air temperature is too hot then the A.Tenebrosa could dry out when out of the water and if the light is to instance and the A.Tenebrosa is in the direct sunlight then the Anemone could dry and out and
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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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of 20.C? 2. Oxygen gas is collected at a pressure of 123 kPa in a container‚ which has a volume of 10.0 L. What temperature must be maintained on 0.500 moles of this gas in order to maintain this pressure? Express the temperature in degrees Celsius. 3. How many moles of chlorine gas would occupy a volume of 35.5 L at a pressure of 100.0 kPa and a temperature of 100. C? After determining the number of moles‚ calculate the number of grams of chlorine (Cl2) contained in this container
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