other. If multiple spots were present for a compound‚ give Rf value for each component and state if the component was major or minor. | 100% hexane | 25% EtOAc in hexane | 10% EtOAc in hexane | Fluorene | 0.34 cm | 0.94 cm | 0.67 cm | 9 - fluorenol | 0.00 cm | 0.49 cm | 0.05 cm | 9 - fluorenone | 0.00 cm | 0.69 cm | 0.21 cm | 2. Explain how Rf values were generally affected by polarity of the solvent/eluent systems. As part of your answer‚ rank the solvent/eluent systems in order of decreasing
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Chromatographic Separation of Fluorene and Fluorenone Abstract: A mixture of Fluorene (1) and Fluorenone (2) was separated by column chromatography. Chemical Equation: Fluorene (1) Fluorenone (2) Mp 114C mp 83C MW 166.22 MW 180.21 Introduction: Column chromatography was invented by Tswett in 1906 so that his study of the chemistry of chlorophyll could be facilitated. Tswett made significant advances in the method and demonstrated its applicability to the separation
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Discussion: In this experiment a ketone‚ 9-fluorenone is reduced to and alcohol. The are two possible ways by which this reduction can occur. One is by a catalytic hydrogenation‚ this uses a catalyst such as palladium or nickel‚ hydrogen gas‚ and heat/pressure. This can reduced an alkane to alkene. This catalytic process is preferred in industrial practices because the cost is low in the long run and more importantly there is little to no waste expense. However‚ hydrogen gas is dangerous due to
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conversion of fluorene to Fluorenone. In order to achieve the goal of the experiment fluorene was oxidized to Fluorenone. The hydroxide ions from the sodium hydroxide in the presence of Stark’s catalyst would be able to de-protonate the acidic fluorene protons. This would result in the formation of a carbanion which attacks the oxygen from the air resulting in the formation of a hydroperoxide and eventually a ketone (after removal of water). Since the goal was to have a mixture of 50% fluorene conversion
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difference between a’smart’ and a’smart’? Write a paragraph that describes how each compound is attracted to each element and silica. The first eluent (A)‚ 9-fluorenone greatest IMFs are dipole-dipoles‚ although silica allows for short dipole-dipole interactions‚ which is possible because of its polar regions. This relationship is exemplified by 9-fluorenone?s high Rf values‚ and a strong affinity towards the stationary. phase. The symposia are. Eluent B‚ 4‚4-diaminodiphenylmethane‚ as well as eluent
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The commandments are absolute pronouncements of right and wrong in all situations In Mormon 9:9 it says: "For do we not read that God is the same yesterday‚ today‚ and forever‚ and in him there is no variableness." This expresses that for every situation the commandments are the same. There is a clear example that shows that the commandments are the same regardless of the situation. We are commanded to be baptized for the remission of our sins. It is a requirement to enter the waters of baptism to
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Mead Professor McCormick Sociology 2 December 2012 District 9 Though this may seem like any other stereotypical extra-terrestrial movie‚ District 9 is unique in that it creates a scenario showing human discrimination towards alien begins; something that is an obvious metaphor for all racial discrimination. District 9 shows a world where the battle for previously eliminated racial equality resurfaces. It is no coincidence that District 9 is set in South Africa‚ where apartheid‚ discrimination mainly
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District 9 is more evolved as a science fiction film than Avatar if one analyses the following themes portrayed in the films: The Alien as the “other”‚ Genetic transformation and Dystopia through the use of camera angles and shots‚ colours and music. District 9’s prawns are seen as disgusting creatures that have no recognizable hierarchy‚ no drive and no understanding of their situation. They are just animals that have the misfortune of landing in Johannesburg. The main prawn in District 9 is Christopher
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Cambridge IELTS 9 Ðây là phiên bản html của tệp ftp://ftp.cup.cam.ac.uk/pub/elt/outgoing/Cambridge%20IELTS%209_2nd%20proofs/9781107615502p001-176.pdf. G o o g l e tự động tạo ra những phiên bản html của các tài liệu khi chúng tôi crawl web. Những cụm từ tìm kiếm này đã được tô sáng: cambridge ielts 9 Page 1 Cambridge IELTS 9 Authentic examination papers from Cambridge ESOL file:///C:/Users/kohaku/Desktop/Cambridge IELTS 9.htm 1/120 10/14/12 Cambridge IELTS 9 9 8 1 7 1 5 2 0
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Assignment Instructions Unit: 9 Instructions: This week’s assignment consists of watching a scenario about Sandwich Blitz‚ Inc. and answering questions regarding the use of new technology as a means of improving communication between employees and customers. Sandwich Blitz‚ Inc. has a great problem...an increase in the number of customers! Employees have been consistently reporting that they are overwhelmed by the volume of customers and management has noticed that the number of reported
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