Purpose: The purpose of this lab was to determine the freezing point of pure water‚ the experimental van’t Hoff factor for a substance and the molar mass of an unknown solution. Reagents: 25mL deionized Water ¼ to ½ inches of rock salt 25mL Sodium Nitrate (NaNO3 ) 25mL unknown solution – handle unknown solution carefully Procedure: For part 1‚ the freezing point of deionized water was determined. An ice bath was prepared by filling a 600mL beaker ¾ full of ice and covered with ¼ to
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Nick Boyea Billy Lee 3/9/11 Molar Mass by Freezing Point Depression Overview The purpose of this lab is to measure the freezing point depression of a solution of an unknown substance and BHT to determine the molar mass of the unknown substance. Summary of Lab Procedure If not already completed‚ crush a small amount of BHT and pack it into a capillary tube. Use a small rubber band to clamp the capillary tube to the thermometer‚ and fasten the thermometer to a ring stand. Fill a Thiele tube
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Jasper F. Cropsey is one of the famous American landscape painters of the second generation of the Hudson River School during the 19th century. In his work American Harvesting (1851) that is now kept in the IU art museum‚ he presents the American landscape as an uncorrupted and prosperous Eden‚ where human beings live there effortlessly as masters of nature. The most recognizable stylistic feature in his work would be the balance of wilderness and civilization‚ which is accomplished through the use
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Harvesting Wheat From the ancient times‚ wheat has been the major crop that makes people survive. To this day‚ we still rely on wheat to fill our stomachs. When people think of the agriculture of California‚ they don’t have their first thought on wheat. However‚ wheat is grown throughout the whole state. California was once said of having the finest wheat in the nation‚ and we have the largest milling capacity of all states. With such a great weather fertile land and a huge landmass‚ California
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full determination for certain chemicals and their boiling points. It lists some already but given the atomic numbers of any material this project includes a conversion and calculation chart to find the freezing point of most any material. GOOD LUCK! Abstract: In this lab we determined the freezing point‚ and Kf‚ of pure 2‚4‚dichloralbenzne as well as a 2‚4‚dichloralbenzne/biphenyl solution. We used this information to determine the molar mass of an unknown (#24) by the 3rd step in the experiment
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STUDY ON POTENTIAL USES OF RAINWATER HARVESTING IN URBAN AREAS Thamer Ahmed Mohammed‚ Megat Johari Megat Mohd. Noor‚ Abdul Halim Ghazali Department of Civil Engineering Faculty of Engineering University Putra Malaysia 43400 UPM Serdang‚ Selangor‚ Malaysia e-mail:thamer@eng.upm.edu.my Abstract Rainwater harvesting is the collection of water volume from raindrops. Rainwater harvesting has been the main source of water supply for potable and non-potable uses in the old days because the water conveyance
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believes if cloning is not banned‚ society will be more dependent upon technology and be at technologies whim. Preventing a Brave New World In "Preventing a Brave New World"‚ Leon Kass concludes that reproductive and therapeutic cloning of human embryos is unethical. He provides several thoughts as to why and how he has reached this decision. Kass believes the progression with technologies and the advancement of cloning has its root cause in the evolution of man and the ideals of the future man;
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How has human practices at harvesting ocean resources affected the ecological state of the ocean? What are sustainable ways we can harvest these much needed resources? Work Log: Narrowed the topic down from human intervention into a report about how the harvesting of ocean resources affect the natural order Structure: Introduction- Talk about the Background statistics‚ introduce what this report will be on‚ and present a few maps. Present the areas this report covers to answer the question
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2013 LECTERUR : EXPERIMENT 4 DETERMINING MOLECULE WEIGHT BY FREEZING POINT DEPRESSION METHOD STUDENT NAME : ID : LAB PARTNERS | | INTRODUCTION According to Anne‚ n.d‚ the freezing point of a liquid is decreased by adding to another compound to it. This is known as freezing point depression. The pure solvent will have higher freezing point than the solution. Colligative property of matter can explain more about freezing point depression. Whereas‚ colligative properties depends on the
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Experiment 3 Colligative Properties Freezing-Point Depression and Molar Mass By‚ Andrew Klingsporn Joby J. Chem 212 Dr. Chandana Meegoda 2/11/2009 Purpose The purpose of this experiment is to determine the Molar Mass of an unknown substance using its freezing point depression. Introduction There are two types of mixtures; homogenous and heterogeneous. Homogenous mixtures have components that are uniformly mixed‚ while heterogeneous mixtures do not. A solution is a homogenous mixture
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