Sublimation of Vanillin and O-Vanillin

Experiment In this experiment a high vacuum sublimation was performed to determine the vapor pressure and finally the enthalpy of sublimation of Vanillin and o-Vanillin. AKnudsen cell with sample was weighed 10 times maybe just say weighed by difference, they don’t usually like it when you spell out the steps like that no way it was like 0. 5 grams, check the lab again and at least 0. 5 g of Vanillin or o-Vanillin was added to the cell and it was reweighed 10 times.This experiment depended heavily on the method of weigh by difference when determining the mass of sample (Vanillin or o-Vanillin) loss in sublimation. A water bath (70 Â °C for vanillin or 40 Â °C for o-Vanillin) is prepared for the sample. The Knudsen cell was inserted into the sample tube and the closed end of the sample tube was placed into the prepared water bath. The tube with the O-ring was connected to the sublimation apparatus. The diffusion pump was connected to the water supply and turned on to 90 V. Th e cold trap of the apparatus was filled with Liquid nitrogen every hour of the experiment.Maybe talk about the type of vacuum pump used since there was so much about it in the lab manual After the sample had reached and sustained the desired temperature for about 5 minutes the sublimation region was roughed.. Just say that you roughed, they don’t usually like this step by step stuff with the valves, but I do like that talk about the pressures that we reached The time between the opening of valve 1 and 3 was the uncertainty in total time. The sublimation apparatus was place under high vacuum to initiate the sublimation process.After making sure the exhaust region pressure did not rapidly increase the temperature of the water bath was recorded every couple of minutes until only 15 minutes were left in the laboratory. This experiment was repeated for a 2nd trial with the only change being the water bath ( 55 Â °C for Vanillin or 30 Â °C for o-Vanillin). Need degree signs Data Analysis The purpose of this experiment was to determine the vapor pressure of Vanillin and o-Vanillin to thus determine the enthalpy of sublimation of Vanillin and o-Vanillin.The mass loss was determined by weighing the difference in the mass of the Knudsen cell + sample before and after sublimation. The area of the Knudsen cell orifice was determined by using the area of a circle equation A= (d/2)2 . The dimensionless correction factor (? ) was determined using the equation ? =1-0. 5(l/d)+0. 2(l/d)2 . Using the measured values of mass loss (m), total time (t), and temperature (T), along with calculated thickness parameter (? ) and area (A) we determined the vapor pressure of our samples using the following equation:Vapor Pressure (P) = ((m)? ( A? t))? SQRT((2 R? T)/(M)) Where R = 8. 314 J/kmol ? The calculated vapor pressure for each trial was used along with the measured average temperature from each trial in the temperature bound integrated Clausius-Clapeyron equation to determi ne the ? HÂ °Sub . Enthalpy of Sublimation ? HÂ °Sub = – Ln(P2/P1)(T2-T1)? R Using the Integrated Clausius-Clapeyron equation and the vapor pressure equation discussed the raw data was used to determine the following analyzed results for vapor pressure and ? HÂ °Sub for Vanillin and o-Vanillin..Probably should add standard deviations, even if they are those weird numbers we were still talking about in lab Thursday. | Vanillin T1| Vanillin T 2| o-Vanillin T 1| o-Vanillin T2| m (kg)| 8. 59E-06Â ±6. 37E-06| 6. 816E-05Â ±2. 458E-07| 2. 916E-05Â ±1. 350E-07| 6. 125E-05Â ±9. 156E-07| T (K)| 329. 02Â ±0. 30| 343. 54Â ±0. 16| 311. 40Â ±0. 08| 302. 73Â ±0. 06| t (sec)| 5732Â ±24| 6870Â ±13| 6291Â ±25| 6291Â ±40| P (Pa)| 1. 0107Â ±0. 2931| 6. 8358Â ±0. 1378| 3. 0406Â ±0. 0622| 6. 2972Â ±0. 1372| ? HÂ °Sub (J/mol)| -230. 728 Â ±239. 311| | 52. 4913 Â ±43. 7797| | ? | 0. 991928| | | | A (m^2)| 5. 024E-07 Â ± 1. 0053E-08| | | |

Economic Background – Greece

Greece has a mixed capitalistic economy with a large public sector that accounts about half of GDP. Besides, Greece is a major beneficiary of European Union aid, which equal to about 3. 3% of annual GDP. In addition, Greece is an agricultural country and one of the poorest countries of the European Union with the second to lowest average income, after Portugal. In January 2002, Greece adopted the euro as its currency. The adoption provided Greece, formerly a high inflation risk country under drachma, with access to competitive loan rates and also to low rates of the Eurobond market which led to a dramatic increase in consumer spending and gave a momentous boost to economic growth. Between 2003 and 2007, Greece economy grew by nearly 4. 0% per year. The preparation for the Athens Olympic Games during 2004 gave an impulse to the Greece economy. However, the financial crisis had slowed down the Greece’s economic growth to 2.0 % in 2008. As a result of the world financial crisis and its impact on access to credit, world trade and domestic consumption, the economy went into recession in 2009 and contracted by 2. 0%. In late 2009, eroding public finances, misreported statistics, and inadequate follow-through on reforms prompted major credit rating agencies to downgrade Greece’s international debt rating, which has led to increased financial instability and a debt crisis. Greek government has approved a three-year reform program that includes cutting government spending, reducing the size of public sector, tackling tax evasion, reforming the health care and pension systems, and improving competitiveness through structural reforms to the labour and product market under the intense pressure by the EU and international lenders. The Greek Government projects that its reform program will achieve a reduction of Greece’s deficit by 4% of GDP in 2010 and allow Greece to decrease the deficit to below 3% by 2012. Greece requested activation of a joint European Union-International Monetary Fund support mechanism designed to assist Greece in financing its public debt in April 2010.

What Techniques Does Auden Employ to Narrate Victorand?

In both ‘Victor' and ‘As I Walked Out One Evening', Auden utilise techniques such as the personfication of time to suggest to the reader that life is a journey and it waits for no one. The use of the first person singular in As Iwalked suggests that it is quite a personal experience, however, in Victor, third person is used to distance the narrator for tge events. W. H. Auden's ‘Victor' includes three different voice through out the poem, his dad, the narrator and Victor himself.Auden uses Victor's dad, who has direct speech during the opening stanzas, to imprint a controlled and biblical lifestyle with no feeling of love. This is further emphasises through the quoatation ‘Don't dishonour the family name'. It is then the narrator who tells the reader about Victor's growing up and his life before and after Anna. Auden does this by the use of the third person when refering to Victor, Anna and the other minor characters through out the play. It is then Victor tha t speaks when asking his father questions such as ‘†¦Ã¢â‚¬ ¦. †¦. ‘ The fact that Victor is asking questions to his afther suggests that he is still trying to please him, which further suggest that Victor is seeking for love in his father. The poem ‘As I Walked Out One Evening' consists of three separate speakers: the lovers, the clocks and the narrator. Each speaker represents a different measure and attitude towards time. The lover’s song paints time to be conquerable and ignorable – no more than a passing annoyance that they are outside of.The soliloquy of the clocks demonstrates time as a product of society, there to keep its subjects in line, and ultimately a ruling force. Finally, the narrator speaks of love as being outside of both of these things. Time is a constant flow than brings change and opportunity, and any claim to deny or control it is an illusion. To begin, the months in ‘Victor' parallel and dictate the events that s hape the poem. The poem begins in ‘frosty December', a vivid image symbolizing Victor's father and his lack of heart for his son.Victor initially meets Anna, the love of his life, in April, a time of rebirth for him. But because it was the first of April, it is Victor who is the fool as the narrative progresses. Victor eventually marries Anna in August symbolizing the warmth Victor feels for the first time in his life. Unfortunately by September, an indicator of the end of summer and the termination of warmth in Victor's life, he jumps to the conclusion that Anna has cheated on him despite the fact that no evidence exists to support his conclusion.Poetic devices add to the overall meaning and interpretation of the poem immensely. The â€Å"Time† spoken of seems to symbolically relate to death, which may, in turn, be a forewarning of Victor's future destructive streak. That leads to the â€Å"Ace of Spades reversed†   the very dagger which Victor slaughters Anna with. The ,coat of fur, Anna wears appears to symbolize her cold, bitter actions, which harm Victor just as Helen of Troy harmed citizens in her time. The simile â€Å"She gave him a kiss like a blow on the head† illustrates that Victor doesn't have the capacity to comprehend real affection.His lack of capacity and lack of warmth is what sparks his jumping to the conclusion that Anna has cheated on him. Meanwhile, Anna is referred to as Victor's Helen of Troy, an ironic allusion to the beautiful wife of Menelaus who began the Trojan War, suggesting that she is beautiful yet dangerous. When Victor persists in asking God questions, he does so at a variety of localities. The vast irony is that from the time he stood in the sunset to the time he came to the river, the locations of his pleas gradually fall from the greatest to the least powerful points.And by the end of the poem, the only thing poor Victor can relate to is the â€Å"woman of clay† ,   personification whi ch represents the only thing Victor can possibly relate to in life. Time is depicted as being something that lurks in the shadows â€Å"time watches from the shadows† and something that creeps up on you when you least expect, and even interrupts couples and lovers when they are at their most intimate  times â€Å"And coughs when they would kiss† this line also again, personifies time. Into many a green valley, Drifts the appalling snow† the first part of this quote represents the beginning of love, before time has interrupted. The word ‘green’ has connotations of summer or spring, the time of year when new things begin to come to life, just like when love begins to blossom. However over time the green valley is taken over by the ‘Appalling snow’ killing all the plants which have blossomed in the summer, time takes its toll on the valley. This is a metaphor for love, love starts of wonderfully, new and fresh.However as time drifts in an d begins to interrupt the love slowly begins to fade and change. The word ‘drifts’ again suggests that time sneaks up on unsuspecting people. In Conclusion, Auden uses techniques such as first person singular, the use of third person and the personification of time. Auden uses these techniques to suggest to the reader that time waits for no one and that it can interrupt at any time. This is further conveys by the quotation ‘and coughs when you kiss'

Planning theory Essay Example | Topics and Well Written Essays - 3500 words

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Marketing Communication Trends Essay Example | Topics and Well Written Essays - 1250 words

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Mainland china culture oriented market Research Paper

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