is done by observing the melting point. This is important because if there is an impure substance the melting point would be depression and the melting range would be broader. By finding the melting point of a known substance one can then observe an unknown substance’s melting point to see if the points are the same and try to figure out the unknown. Experimental Section: The first known substance we used was Biphenyl. 68 degrees Celsius is the known melting point. We used the capillary method
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Experiment Date: 3/12/2012 Photochemistry: Photoreduction of benzophenone and rearrangement to benzpinacolone Abstract: In this experiment Benzpinacolone was synthesized in a process that contained two steps. First the photoreduction of benzophenone in 2-propanol‚ which was done by placing the flask under sunlightfor the absorption of the UV rays to carry out the reaction. Then the second part was the dehydration of benzpinacol to benzpinacolone‚ where the benzpinacol product was converted
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Summary Purpose To purify the component (unknown) of Pancetin from last experiment and then compare its melt point to the two other possible substances. Theory Panacetin should be made up of about 50 percent of the unknown component that we previously separated out of Panacetin for testing. We suspect that this unknown compound is either acetanilide or phenacetin. From the solubility of acetaminophen and phenacetin‚ we could know both of them are relatively soluble in boiling water but insoluble
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Triphenylmethanol from Benzophenone Purpose: The purpose of this experiment was to synthesize the tertiary alcohol triphenylmethanol from a Grignard reagent‚ phenyl magnesium bromide. The Grignard reagent was synthesized from bromobenzene and magnesium and then reacted with benzophenone to produce triphenylmethanol. It was important that water be excluded from the reaction‚ in order to prevent the formation of benzene. The reaction of phenyl magnesium bromide and benzophenone was quenched with sulfuric
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The Purity and Purification of Solids- Part 2- Recrystallization Courtney Percival CH 337 Laboratory‚ Section 037 Department of Chemistry Portland State University‚ Portland OR ABSTRACT INTRODUCTION Recrystallization is a commonly used tool in laboratories when dealing with impure solids. "An effective recrystallization is one in which 1) a high degree of purity is achieved as well as 2) a maximum recovery of sample".1 Solubility‚ the tendency of a substance to dissolve in a liquid‚ is an
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•In “The Yellow Wallpaper‚” Gilman uses the horror tale to analyze the position of women within the institution of marriage‚ practiced by the “respectable “classes of her time. •For the author‚ the conventional nineteenth-century middle-class marriage‚ with its distinction between the “domestic” functions of the female and the “active” work of the male‚ ensured that women remained as second-class citizens. •The story reveals that gender division had the effect of keeping women in a childish state
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Metaphor of the Melting Pot Peggy Ruth Geren The melting pot has been used metaphorically to describe the dynamics of American social life. In addition to its descriptive uses‚ it has also been used to describe what should or should not take place in American social life. How did the term originate? How was it used originally? How is it used in contemporary society? What are some problems with the idea of the melting pot? How is public education connected to the idea of the melting pot? How does
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In a brief essay‚ identify at least two of the implications implicit in the society reflected in the poem. Support your statements by specific references to the poem. The Unknown Citizen Comment [ANn1]: OK‚ so I need to IDENTIFY two implications implicit in the society. I need to make sure I’m speaking only to the society reflected IN the poem. I’ll make sure to quote the poem itself. by W. H. Auden (To JS/07 M 378 This Marble Monument Is Erected by the State) He was found by the
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wherever you are‚ only moment or torque will be relevant. A spring balance is not a comparison technique‚ so gravity changes will be relevant to the result - hence only weight can be measured. Basically‚ if the two forces each side of the balance point (fulcrum) are equal‚ the balance will be horizontal. The pointer on the balance indicates this condition. The sample being weighed has a specific mass generating a fixed moment at its fixed position. The moment exerted by the mass on the other side
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Our Iceberg Is Melting is written by John Kotter‚ the leadership and change guru at Harvard Business School and Holger Rathgeber‚ the modern global manager from Frankfurt‚ Germany. The main topic and the author’s purpose in writing the book are to make successful change through the eight step process. The type of the book is management book that can use by people in every level such as manager in one organization‚ high school student‚ executives‚ retirees and others in order to better achieve what
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