Impact of Latest Little Ice Age on Human Population

Impact of Latest Little Ice Age on Human Population William Lee Nowadays, the presence of Ice Ages which refer to the periodic long-term reduction in temperature of Earth’s surface and atmosphere, is well-known among people. However, most of them never heard of how another kind of geographical phenomenon, Little Ice Age (LIA), occurring from the fourteenth to the nineteenth centuries, influenced our culture, technology and our world today. Can you imagine how our lifestyle would be influenced? Can you imagine how the world would be totally different if it had never suffered from the LIA? This essay will discuss about what the LIA brought to our ancient ancestors and how it affected the world today. Let’s see what is meant by LIA. Distinct from the ice age, which refers to the long-term alternations between glacial periods and interglacial periods lasting for millions of years, the little ice age is another geographical terminology used to describe a pre-modern time period starting roughly from the 14th century, lasting until 19th century. During the LIA, the Earth was chilled by a sudden cooling and the average temperature of the Earth’s surface and atmosphere decreased by 2 degree centigrade than before. This enormous change was usually considered as the effect of solar activity variation (Lesley M. Smith,1997) and the relative position of Earth while rotating around the sun (John A. Eddy,1976). Some new researches also suggest other causes for the LIA, such as increased volcanic activity (Jonathan Cowie, 2007), or altered ocean current flows (Broecker WS, 2000). Due to the relatively higher latitude of land in the north hemisphere, the LIA had a predominant influence on the Eurasia continent rather than others. Meanwhile, most of human civilizations were gathering on the Old Continent. Reasonably the unexpected visit of this drastic change on climate affected human activities in such a complex way that is not easy to tell. However, we do can find some clues and records remained in the history, which can help us figure out the complicated process of change gradually. In order to analysis the impact of the LIA easily, we can try to make a clear image of human cultures by summarizing the status of every civilizations including empires, realms, kingdoms and independent regions existing during this period. At the beginning of 14th century, the Mongol Horde just invaded European countries and at the same time, China in the eastern world had been, for the first time, under foreign rule of Mongolian for already several decades. The Hundred Year’s War was just about to start and Italy was leading Europe to step into the period of Renaissance. A new dynasty called Ming arose after Chinese people stood up to fight against the cruel foreign rulers and in the next three hundred years, the prolonged war fire on the land of China finally came into a short time of peace. In fact, a storm was approaching silently, like the volcano hidden under the sea, it would erupt at any moment†¦Black Death killed a third of population in Europe. Russian and Norse begun to explore new lands†¦ In the fifteenth century, as Constantinople, the pivot on the way to the East, fell to the emerging Ottoman Turks, Western Europeans had to find a new trade route. The forthcoming Age of Sail allows Spanish and Portuguese explorers led to the first European sightings of the New Land (America and other virgin islands) and the sea passage along Cape of Good Hope to India. Then in the sixteenth century, thanks to the Queen Victoria, Britain became a super power on which† the sun never set†, and began to expand its territory all over the world. The Era of Colonization came with spread of culture, disease, thoughts, technology†¦ A peak of chilling little ice age came in the beginning of seventeenth century. The production of crops kept in a low level due to the persistent low temperature. Ming Dynasty collapsed under a series of peasants uprisings. Revolutions for independence or freedom of thought dominated the eighteenth century. And then Industrial Revolution accelerated the world into thrive. Now we have already got a rough image about the corresponding history. But still, how is these historical events linked with the LIA? Here is an example illustrating the LIA’s impact on agricultures. Since the beginning of fourteenth century, the cold weather and heavy storms swept Europe. Crops and livestock were enormously destroyed. Crises arose as political struggles and class warfare weakened those previously prosperous countries. Millions of people starved to death. Cannibalism was even recorded during the Great Famine, which lasted for at least a decade. According to Lamb (1966)’s report, the growing season varied by 15% to 20% between the warmest and coldest times of the millennium. This is fairly enough to adversely influence any type of food production. Without modern technology, such as protection of warm house, seeds especially those highly adapted to warm conditions, could hardly survive this change. In order to adapt increasingly unpredictable climates, farmers begun to experiment with new agricultural techniques and equipment (J. Cohen, 2012). This led to the Agriculture Revolution in Europe. In addition, the LIA also caused significant effect on economy, especially in Europe. Because of the Great Famine, heavy storms and growing glaciers, a large area of farmland was destroyed, which led to decreased tax revenue collected (Lamb,1995). Maritime activities were also limited by expanding glaciers, which caused a huge impact to the fishery and oversea trading (Lamb,1995).Miners lost their jobs due to the advancing glaciers as well. (Bryson, 1977.) However, not all of those influences were bad. One of the four greatest fisheries in the world, the fishery along the Newfoundland coast, was founded by fishermen who were looking for new fish stocks in result of the movement of colder water (Lamb, 1995). The LIA also brought great politic change to both western and oriental world. In China, the LIA made most of the participation shift towards south. This caused frequent droughts all over the provinces of China. The most severe one of them lasted for at least seventy years. Along with several massive earthquakes happening at the same time, this huge but declining agricultural country was finally defeated by corrupted bureaucracy and the Manchurian invaders from the northeast, who took advantage of the power vacuum and crossed the Great Wall, later on established the Qing Dynasty (Kezhen Zhu, 1972) In west Europe, â€Å"as the 18th century drew to a close, two decades of poor cereal harvests, drought, cattle disease and skyrocketing bread prices had kindled unrest among peasants and the urban poor in France.† (J. Cohen, 2012) Many people who managed to express their disaffection yet failed eventually decided to rise up and fight the government which imposed heavy taxes. Therefore, the brewing storm broke in 1789, while the French Revolution incurred. Many historians believe that that was somehow connected to the LIA. Although a large amount of evidences indicate that the LIA actually influenced ancient civilizations in various ways, there are still arguments disapproving this opinion. The theory which explains human history as an outcome of effects from geographical factors, or â€Å"human habits and characteristics of a particular culture are shaped by geographical conditions† as the dictionary explains, is called geographical determinism. Criticisms point out that the theory exaggerates the effect of natural environment on the development of human society. It is obviously incorrect to substitute natural law for social law. The geographical environment is one of necessary external conditions for human society to develop, admittedly, it affects considerably society as well. Nevertheless, it is absolutely not the determinant of development of human society. In fact, its effect may decrease as the human society goes forward. Other criticisms focus on the explanation that historical events are considered as inevitable trend or irresistible outcome of some natural factors. For example, they think that it’s unreasonable to impute the collapse of Ming Dynasty of China to the little ice age alone. The corrosion of government and bureaucracy along with the policy of seclusion which caused the stagnation of technology development, are also critical reasons for the declination of China (Calebjael, 2014). In conclusion, history is a long and complicated story written by every person, every movement, everything which has ever existed in the past time. Geographical factors, such as the presence of little ice age, will inevitably play an essential role in the history, especially in the ancient time. Today, our developments on technology allow us to do whatever we want to do, in spite of the nature. However, it takes price. Our achievement today mostly depends on what the nature gave to our ancestors. We should learn with respect what our ancestors encountered and how they dealt with them, what lesson they did take and what we should do in the future. The little ice age influenced human beings’ society from aspects including agriculture, economics, politics and cultures, etc. and therefore determined the life today to some extent. Our thoughts should be never limited in the little ice age. There are so many other geographical factors and historical events awaiting for us to explore . The attempt of discovering our history never ends. Reference List: Albion C. 2014. Impact of The Little Ice Age in Europe. Accessed on 28 June, 2015. Available from http://www.theapricity.com/forum/showthread.php?36426-Impact-of-The-Little-Ice-Age-in-Europe Brian M. Fagan 2000. The Little Ice Age: How Climate Made History, 1300-1850. Publisher: Basic Books Imbrie J.; Imbrie K.P (1979). Ice ages: solving the mystery. Short Hills NJ: Enslow Publishers. ISBN 978-0-89490-015-0. Accessed on 20 April 2015. Jennie Cohen 2012. Little Ice Age, Big Consequences. Accessed on 15 March, 2015. Available from http://www.history.com/news/little-ice-age-big-consequences Jonathan Cowie 2007.Climate change: biological and human aspects. Publisher: Cambridge University Press Kelly Morgan, 2010 The economic impact of the little ice age. Accessed on 20 April 2015. Available from http://researchrepository.ucd.ie/handle/10197/2649 K. Kris Hirst,2010 The Little Ice Age and Polynyas. Accessed on 20 April 2015. Available from http://archaeology.about.com/od/arctic/fl/The-Little-Ice-Age-How-Human-Cultures-Respond-to-Climate-Change_2.htm Peter J. Robinson 2005. The Little Ice Age, Ca. 1300 – 1870. Accessed on 16 March, 2015. Available from http://www.eh-resources.org/timeline/timeline_lia.html Scott A. Mandia, 2010 The Little Ice Age in Europe. Accessed on 20 April, 2015. Available from http://www2.sunysuffolk.edu/mandias/lia/little_ice_age.html

A comparison of the contemporary labour and conservative parties in britain

The long history of political rivalry in Great Britain has always been between the Conservative and Labour Parties. National leaders who were representative of both come and go in the same way as the popularity of both parties rise and fall over decades.Labor Party’s Tony Blair was able to bring back the party into the limelight where it was previously before 1970s. Its close rival party, the Conservatives has enjoyed the prestige during the seventies when the Labour Party made countless mistakes, or shall we say unsound decisions on labor issues and policies.CNN News called that particular labor issue as the party’s â€Å"tailspin† which includes Labor-spending policies, which brought Britain to an economic situation where it shamefully needs to seek for the assistance of the World Bank through a bailout loan (Blystone, Richard). A year called â€Å"Winter of Discontent† which ran from 1978 to 1979 turned the popularity of the Labour Party upside down. Th e worst thing that could ever happen as a consequence of the yearlong discontent was to lose the seat in the next election.The Labour Party was losing support as more and more people go to the streets and join rallies. That year, there were about 4.6 million workers to go on strike causing the British economy around 29 million workdays. Part of the protests against the Labour government was to let their garbage remain uncollected in the streets which indicate that no one would want to go out work during those days.In 1980, the Labour Party’s fear of losing the election came as had never been expected after rumblings of discontent with William Hague's leadership. Margaret Thatcher of the Conservative Party beat the Labour’s representative in the national elections. It was also important to mention that the Conservative Party won a majority of 33 seats in the Parliament. After Thatcher’s victory, the Labour Party did not have any chance of winning over the Conserv atives for 18 years.Thatcher was the first woman in the British political party who work hand in hand with John Powell to bring the Conservative Party into a strong political party after losing in the 1974 elections. Conservatives have also undergone erratic relationships within the party, members come and go and move to and from other parties especially on cases where there are major disagreements in its member. With Powell and Thatcher, things got better this time. Their strategy to bring back the popularity of the Conservatives was to take the opportunity to win the hearts and trust of the people during the â€Å"Winter of Discontent†.They made use of the media to make people believe that the government should not in any way have an involvement in the social and economic matters. â€Å"Thatcher constructed a new social base of support for her party that came less from the traditional conservatives' backers, the upper classes and landed gentry, than from the middle classes and skilled workers who felt increasingly discontent and unrepresented by the traditional policies and orientations of the two major political parties† (Rasmussen, et.al. 1995).Thatcher’s gained popularity through the Conservative Party enabled her to win the 1979 elections first, because of the discontent of the people on labor issues the year before the elections. Second, it might have been because the people wanted another leader outside the Labour government since the latter was not able to make labour concerns a priority in running their government. Lastly, the British have known Thatcher as directly opposed to the labour ideas of the Labour government and of course a campaign have promised the people to have such labor disputes a priority in the next elections which they won.Thatcher was a witty leader in his own right. She won the 1983 elections after having it scheduled at the time when victory over Falkland Islands against Argentina was still fresh. Timely wit h the British economic growth, Thatcher still swept the 1987 elections which let her stay in power until 1990.   But Thatcher failed to bring the Conservatives back in power in the 1990 elections. Although Thatcher was undoubtedly popular at that time, and that Thatcher was known for her sound leadership in dealing with the internal conflicts within her own party, John Major brought her down this time.There were issues which attributed Thatcher’s lost of support from her own party because of her hesitation to support European integration. In this regard, Thatcher compromised her political position when she directly opposed to the general opinion of the British people towards the integration.One more thing was the Thatcher’s poll tax which taxed registered voters to replace property taxes collected by local councils and which was widely viewed as regressive by taxing the lower income strata more heavily than the upper classes. With the leadership of John Major, the is sue of poll tax was little by little eradicated.

Steam Distillation

CONTENTS CONTENTS| PAGES| 1) Abstract| 2-3| 2) Introduction| 4-6| 3) Objectives, Materials and Apparatus, Chemicals| 7| 4) Method| 8| 5) Results| 9-11| 6) Discussion| 12| 7) Conclusion| 13-14| 8) References| 15| ABSTRACT This experiment is about steam distillation by using Dalton’s Law. The objectives of this experiment are to demonstrate a separation of a mixture by using steam distillation and next to prove that Dalton’ Law and ideal gas law are applicable in steam distillation. Dalton’s Law; While Ideal Gas Law; This experiment is conducted by placing 2mL of Turpentine and 15mL of water into the flask. 0mL graduated cylinder is used as the receiver. All the connections are make sure tighten. Next,two boiling chips are added to ensure smooth bubbling and prevent bumping of the liquid up into the distillation head. The heating mantle is adjusted to give vigorous boiling. The first 1. 5mL of distillate is discarded and the next 5mL is collected. The volumes of th e water and turpentine layers in this distillate are recorded. The recorded volume is then compared with the ideal steam distillation law using the tabulated vapour pressure and densities. The volume of water and turpentine recorded are:Turpentine=1. 7mL Water=3. 3mL turpentine -_-_-_-_-_-_-| -_-_–_-_-_-_Water-_-_-_-_-_-_–_-_-_-_-_-_–_-_-_-_-_-_–_-_-_-_-_-_-| In conclusion,it is proven that turpentine and water can be separated using the steam distillation. INTRODUCTION Dalton's Law of Partial Pressures states that for a mixture of gases in a container, the total pressure is equal to the sum of the pressures of each gas. Where P1 is the partial pressure of gas 1, P2 is the partial pressure of gas 2, and so on†¦ OR In the experiment of the steam distillation,we applied the Dalton’s Law of Partiaal Pressure combined with Ideal Gas Law.Steam distillation is a special type of distillation (a separation process) for temperature sensitive materials like natural aromatic compounds. Steam distillation is employed in the manufacture of essential oil, for instance, perfumes. In this method steam is passed through the plant material containing the desired oils. It is also employed in the synthetic procedures of complex organic compounds. Eucalyptus oil and orange oil are obtained by this method in industrial scale. Figure 1 : Laboratory set-up for steam distillationDistillation Temperature and Composition of Distillate As with ordinary distillations, the boiling point is the temperature at which the total vapor pressure equals the atmospheric pressure. If the vapor pressures of the two components are known at several temperatures, the distillation temperature is found readily by plotting the vapor pressure curves of the individual components and making a third curve showing the sum of the vapor pressures at the various temperature. The steam distillation temperatures will be the point where the sum equals the atmospheric pressure.K nowing the distillation temperature of the mixture and the vapor pressures of the pure components at that temperature, one can calculate the composition of the distillate by means of Dalton’s law of partial pressures. According to Dalton’s law, the total pressure(P) in any mixture of gases is equal to sum of the partial pressures of the individual gaseous components (? A , ? B, etc). The proportion by volume of the two components in the distilling vapor will consequently be equal to the ratio of the partial pressures at that temperature; the molar proportion of the two components (?A and ? B) in steam distillation will be given by the relationship ? A/? B = ? A/ ? B, where ? A + ? B equals the atmospheric pressure. The weight proportion of the components is obtained by introducing the molecular weight (MA and MB) Weight of A / weight of B = (? A x MA) / (? B x MB) Example . Consider a specific case, such as the steam distillation of bromobenzene and water. Since the su m of the individual vapor pressures (see Figure below) attains 760 mm at 95. 2? , the mixture will distill at this temperature. At 95. 2? the vapor pressures are bromobenzene, 120mm and water, 640mm. ccording to Dalton’s law, the vapor at 95. 2? will be composed of molecules of bromobenzene and of water in the proportion 120:640. the proportion by weight of the components can be obtained by introducing their molecular weights. Weight of bromobenze / weight of water = (120 x 157)/(640 x 18) = 1. 63/1. 00 Bromobenzene= {1. 63/(1. 00 + 1. 63)} x 100% = 62% Water = {1. 00/(1. 00 + 1. 63)} x 100% = 38% The weight composition of the distillate will therefore be 62% bromobenzene and 38% water. OBJECTIVE To demonstrate a separation of a mixture by using steam distillation MATERIALS/APPARATUS/EQUIPMENT 00 ml round-bottomed flask, 50 ml Erlenmeyer flask, stoppers, naphthalene, salicylic acid. METHOD Steam Distillation of Turpentine 1. The apparatus for steam distillation are arranged a s shown in Figure 1. 50 ml of distilling flask and 10 ml graduated cylinder is used as the receiver. 2. In the flask, 5 ml, (4. 3g) of turpentine ( bp 156-165 at 760 mm) and 15 ml, of water is placed. 3. Two boiling chips are added and the heating mantle is adjusted to give vigorous boiling. It is essential for the success of this experiment that the mixture boiled rapidly with good mixing of the two phases.Because the point of this experiment is to measure an equilibrium composition and the initial distillate may not have time to equilibrate, the first 1. 5 ml of distillate is discarded and the next 5 ml is collected. 4. The volumes of the water and the turpentine layers at this distillate are recorded. 5. The ratio of the volumes actually found is compared with the ratio calculated from the ideal steam distillation law using the tabulated vapor pressure and densities. 6. The distillation temperature observed is compared with the calculated value. RESULTS turpentine -_-_-_-_-_-_-| _-_–_-_-_-_Water-_-_-_-_-_-_–_-_-_-_-_-_–_-_-_-_-_-_–_-_-_-_-_-_-| Turpentine = 5. 0mL Water = 15. 0mL Weight composition: Water = 15. 0 x 100 20. 0 = 75 % Turpentine = 5. 0 x 100 20. 0 = 25 % The weight composition that will be distillate will be 75 % water and 25 % turpentine. After the mixture have been distilled, here is the result: Total volume of distillate = 5. 0mL Turpentine = 1. 7mL Water = 3. 3mL Weight composition: Water = 3. 3 x 100 5. 0 = 66 % Turpentine = 1. 7 x 100 5. 0 = 34 % Ratio of turpentine to water : Turpentine : Water 0. 34 : 0. 66Weight of turpentine/ Weight of water = [0. 34 x [12(10)+1(16)]] / [0. 66 x [1(2)+1(16)]] = (0. 34 x 136) / (0. 66 x 18) = 46. 24 / 11. 88 = 3. 8923 Turpentine = [ 46. 24 / (46. 24+11. 88) ] x 100% = 79. 5595 % Water = [ 11. 88/ (46. 24+11. 88) ] x 100% = 20. 4405 % Temperature, T/C| Volume of distillate, V/mL| 94| 1st 1. 5mL| 94| 1| 94| 2| 94| 3| 94| 4| 94| 5| DISCUSSION 1. What properties must a substanc e have for a steam distillation to be practical? For steam distillation of a substance to be carried out, the substance must be heat sensitive. It must possess a lower boiling point than water.This method is also advisable for highly volatile liquids because highly volatile liquids denatures at high temperatures. 2. What are the advantages and the disadvantages of steam distillation as a method of purification? Among the advantages of steam distillation is organic compounds which is steam distilled will evaporate at lower temperatures, most probably below their temperature of denaturation. Besides that, heat sensitive aromatic compounds which cannot be distilled by direct heating can be processed. On the other hand, the disadvantages of this method are this method is not exactly suitable for all types of aromatic oils.Only certain types of aromatic oils are suitable to be processed using this method. Furthermore the heat is difficult to control causing the rate of distillation to be variable. -Our group apparatus got some problems. The turpentine that has been distillated accumulated at the joint of the apparatus. This is because the apparatus less slope, leads the turpentine to accumulate, resulting long time to collect the distillated turpentine. CONCLUSION Steam distillation is a special type of distillation (a separation process) for temperature sensitive materials like natural aromatic compounds.Many organic compounds tend to decompose at high sustained temperatures. Separation by normal distillation would then not be an option, so water or steam is introduced into the distillation apparatus. By adding water or steam, the boiling points of the compounds are depressed, allowing them to evaporate at lower temperatures, preferably below the temperatures at which the deterioration of the material becomes appreciable. Therefore, as the conclusion, it is proven that turpentine and water can be separated by using steam distillation.It is also known that water ha s a higher density than turpentine. Next, Dalton's law (also called Dalton's law of partial pressures) states that the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture. This empirical law was observed by John Dalton in 1801 and is related to the ideal gas laws. On the other hand, the ideal gas law is stated as the equation of state of a hypothetical ideal gas. It is a good approximation to the behavior of many gases under many conditions, although it has several limitationsTherefore, as both of these laws are involved, we can conclude that both Dalton’s Law and Ideal Gas Law are applicable in steam distillation. Based on the result of the experiment, water contains 80% and turpentine contain 20% portion. Some errors might have occurred during the experiment that caused the results to be differed from the theory. During the experiment, the apparatus must handle carefully because it is easily broken. To increase the accuracy of the result, thermometer is used in the flask so we can read the temperature in the flask.We must use stopper to close the flask because it can avoid the water vapour escape to the environment REFERENCES John R. Dean, Alan M. Jones, David Holmes, Rob Reed, Jonathan Weyers and Allan Jones (2002). Practical Skills in Chemistry. Edinburgh Gate, Harlow, Great Britain: Prentice-Hall Carl W. Garland, Joseph W. Nibler, David P. Shoemaker, (2003). Experiments In Physical Chemistry. 7th Edition. New York, N. Y. : McGraw-Hill Umland and Bellama (1999). General Chemistry. 3rd ed. Pacific Grove, CA: Brooks/Cole Publishing Company APPENDICES Steam Distillation Experiment 2: Isolation of Eugenol from Cloves Background; Readings on Vapor pressure, Raoult’s Law from TRO: A mixture of the essential oils, eugenol and acetyleugenol, will be steam distilled from cloves. These compounds are isolated from aqueous distillate by extraction into dichloromethane. The dichloromethane solution is shaken with aqueous sodium hydroxide, which will react with eugenol, to yield the sodium salt of eugenol in the basic aqueous layer, and acetyleugenol in the organic layer. The basic aqueous layer can be acidified to re-extract eugenol from it.And the organic layer can be dried and concentrated to yield acetyleugenol The principle of steam distillation is based on the fact that two immiscible liquids will boil at a lower temperature than the boiling points of either pure component, because the total vapor pressure of the heterogeneous mixture is simply the sum of the vapor pressures of the individual components (i. e. PT = PoA + PoB, where Po is the vapor pressure of the pure liquids). This leads to a higher vapor pressure for the mixture than would be predicted for a solution using Raoult’s Law(applies for iscible mixtures) (that is PT = Po(A)n(A) + Po(B)n(B), where n is the mole fraction of the component in the mixture). The higher total vapor pressure leads to a lower boiling point for the mixture than for either single component. The boiling point of eugenol, an oil found in cloves, is 248  °C, but it can be isolated at a lower temperature by performing a co-distillation with water. Steam distillation allows separating substances at lower temperatures which is useful since many organic compounds tend to decompose at high temperatures which regular distillation would require.For steam distillation to be successful, the material to be isolated must be insoluble in water. Usually   these compounds have a low vapour pressure. After mixing them with water, however, the mixture will distil when the sum of the two vapour pre ssures reaches atmospheric pressure. It follows, then, that this must happen below the boiling point of water. Note that by steam distillation, as long as water is present, the high-boiling component vaporizes at a temperature well below its normal boiling point without using a vacuum.Since eugenol is not soluble in water, the concentration of the eugenol in the vapor over the boiling eugenol– water suspension does not depend on concentration of the eugenol. The relative amounts of eugenol and water in the vapor simply depend on the vapor pressures of the pure materials. The vapor pressure of water at 100  °C is 760 torr, and the vapor pressure of eugenol at 100  °C is approximately 4 torr; (Note, the suspension boils when it’s vapor pressure is equal to the external pressure.Since both the eugenol and the water are contributing to the vapor pressure of the suspension, the suspension will boil before either pure substance would normally boil. ) Since the distillate will contain both water and eugenol, the eugenol must be extracted from the water using an organic solvent. Once the eugenol is extracted into an organic solvent,the organic layer is separated from the aqueous layer and dried. The eugenol is finally isolated by evaporation of the organic solvent. When   the sum of the separate vapor pressures equals the total pressure, he mixture boils and P =P(A) + P(B) Where PA is vapor pressure of pure water A PB is vapor pressure of pure B 1 Then the vapor composition is Y (A)= PA/P Y(B) =PB/P Dalton’s Law: PAV1 = nART1 and PBV2 = nBRT2 V1 = V2 and T1 = T2 n = moles, The ratio moles of B distilled to moles of A distilled is OH OCH3 OAc OCH3 Eugenol AcetyleugenolObjectives: To extract Eugenol and Acetyleugeonol from cloves To separate the mixture of eugenol and acetyleugenol using their acid- ­? base properties. To characterize eugenol and acetyleugenol using TLC(Rf values) andRefractive index. Glassware: Beaker to mass the cloves, Er lenmeyer flasks(2, 50- ­? ml), storage container+ distillation glassware(there should be an assembly in the fume hood) Procedure: Week 1: Steam Distillation Place 10 g of whole cloves (ground using a mortar and pestle by the teacher) in a 100-mL round-bottom flask, add 50 mL of water, and set up an apparatus for simple distillation- steam (will be set up in the fumehood and you can draw the set up while in the lab) will be generated in situ(50 ml of water added to the flask will generate the steam).Heat the flask until boiling begins, then reduce the heat just enough to prevent foam from being carried over into the receiver. Use a 50-mL Erlenmeyer flask as a receiver(the distillate will collect in the flask thro a funnel) and transfer periodically your distillate to a 50-mL graduated cylinder. While you have removed one receiver, do not forget to replace the Erlenmeyer flask with a second one(that is clean and dry). 2 Caution: It is important that the cloves remain covered with wa ter at all times. Or else, the cloves will burn and smoke!Also, the distillation has to be steady. If not the mixture will foam and the foam will drop down the condenser into the receiving flask. And this would contaminate the distillate. Save the distillate in a tightly capped bottle for the following week. Week 2: Separation of Eugenol and Acetyleugenol via acid/base extraction Place the 50 mL of distillate in a 125-mL separatory funnel and extract with three 10-mL portions of dichloromethane. Combine the dichloromethane extracts and reserve 1 mL for thin layer chromatography. teacher will explain this step) To separate eugenol from acetyleugenol: pour back the dichloromethane extracts into the separatory funnel, extract the dichloromethane solution with 5% aqueous sodium hydroxide solution. Carry out this extraction three times, using 5-mL portions of sodium hydroxide each time. KEEP the aqueous extracts (it contains eugenol) and dry the organic layer over sodium sulfate (add eno ugh so the drying agent no longer clumps together but appears to be a dry powder as it settles in the solution).Swirl the flask to complete the drying process and let the drying agent settle for 1 minute before decanting into a DRY and TARED Erlenmeyer flask, rinse the drying agent with two 2-mL portions of dichloromethane. Evaporate the solution on a steam bath, the residue should be aetyleugenol. Acidify the combined aqueous extracts to pH 1 with concentrated hydrochloric acid (use Litmus paper to monitor the pH), and then extract the eugenol with three 5-mL portions of dichloromethane.Dry the combined extracts over sodium sulfate, as done before, decant into a DRY and TARED Erlenmeyer flask, and evaporate the solution on a steam bath, the residue should be eugenol. Cleaning Up: Combine all aqueous layers, neutralize with sodium carbonate, dilute with water, and flush down the drain. Any solutions containing dichloromethane should be placed in the halogenated organic waste contain er. Wash up all glassware with soap and water. Analysis: Calculate the weight percent yields of eugenol and acetyleugenol oils based on the weight of cloves used. Analyze your products sing refraction index. Analyze your products using thin layer chromatography (TLC). Eluent: dicloromethane-hexane (1:2 or 2:1)Vizualization: under UV light and iodine chamber AS Co AE AS – Acetyleugenol Standard Co – Co-spot AE – Acetyleugenol Extract ES Co EE ES – Eugenol Standard Co – Co-spot EE – Eugenol Extract ES Co CM ES – Eugenol Standard Co – Co-spot CM – Crude Mixture First a TLC plate is prepared by spotting the purified unknown and an authentic sample of each possible compound. Then the TLC plate is developed. For the next step (co-spotting), an authentic sample of the 3 ompound closest in Rf value to the unknown is chosen. TLC co-spotting of a second plate allows for preliminary identification of your compound. Three spots are applied to the adsorbent on the baseline of the TLC plate: the purified unknown, an authentic sample, and a co-spot of unknown and authentic sample. If the developed TLC plate shows only one row of spots, it can be concluded that the unknown has been purifed, and that the unknown is possibly the same compound as the authentic sample.However, because Rf values are relative, not absolute, some compounds may have very similar Rf values Pre- ­? ab: FOR WEEK 1 only: All the required formulae for the caculations have been presented here. Hence googling is not required. MSDS is required for the following chemicals: Eugenol and acetyl eugenol. Pre- ­? lab should be complete to the best of your ability before the lab. Answers will be discussed during the lab. For the procedure : You will draw the glassware set up when you come to the lab; Just come prepared with titles, objectives, MSDS. Questions from pre-lab should ensure that you have understood the theory behind WEEK 1 ; Distillation . 1a. What is the vapour pressure of benzene at 80 egrees celcius. Explain the term vapour pressure. 1b. What is an azeotrope? How would the term azeotrope apply in this experiment? 2a. The vapor pressure of water at 99oC is 733 torr. What is the vapor pressure of eugenol that codistills at this temperature? The amount of the substance X that co- ­? distills together with the water is given by Pwater/px = nwater/nx n(water) = moles of water n(X)= moles of Eugenol 2b. Calculate the mass of eugenol that co-distills with each gram of water at 99oC. How many grams of water must be distilled to steam distill 2 grams of eugenol from an aqueous solution?Calculate mass% for both eugenol and water. 3. What is the difference between essential oil and fatty oil? What would be suitable IUPAC name for eugenol and acetyl eugenol? 4. Based on the formulae presented so far, cite one disadvantage of steam distillation of organic compounds. 5. Steam distillation may be used to separate a mixture of 4- ­? nitrophenol and 2- ­? nitrophenol. The 2- ­? nitrophenol distills at 93 degrees but the 4- ­? nitrophenol does not. Explain. 6. List your observations during the lab: Record the temperatures at various times, nature of the distillate, odour†¦.. 4

Memorize the First 20 Elements on the Periodic Table

If you take a chemistry class there is an excellent chance you will be required to memorize the names and order of the first few elements of the periodic table. Even if you dont have to memorize the elements for a grade, it is helpful to be able to recall that information rather than look it up every time you need it. Memorize Using Mnemonic Devices Here is a mnemonic you can use to help make the memorization process easier. The symbols for the elements are associated with words that form a phrase. If you can remember the phrase and know the symbols for the elements then you can memorize the order of the elements. Hi! - HHe - HeLies - LiBecause - BeBoys - BCan - CNot - NOperate - OFireplaces - F New - NeNation - NaMight - MgAlso - AlSign - SiPeace - PSecurity - SClause - Cl A - ArKing - KCan - Ca List of the First 20 Elements You can devise your own way of memorizing the first 20 elements. It may help to associate each element with a name or a word that makes sense to you. Here are the names and symbols of the first elements. The numbers are their atomic numbers, which is how many protons are in an atom of that element. Hydrogen - HHelium - HeLithium - LiBeryllium - BeBoron - BCarbon - CNitrogen - NOxygen - OFluorine - FNeon - NeSodium - NaMagnesium - MgAluminum (or Aluminium) - AlSilicon - SiPhosphorus - PSulfur - SChlorine - ClArgon - ArPotassium - KCalcium - Ca