high yield of caffeine was obtained. The crystals melted at 202-214°C. Explain. • The sodium carbonate is supposed to be added when extracting the tea leaves with hot water in order to help purify the caffeine. So since the student neglected to add sodium carbonate the caffeine won’t be pure but the student would still be able to recover a large amount of caffeine. The literature melting point is 238°C. Because the caffeine wasn’t pure enough‚ the observed melting point was a little off. 2. The weight
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In‚ The One Percent Solution‚ by Gordon Lafer‚ he argues that lobbyist groups are taking advantage of the 2008 recession to work to advance the interests of the wealthy. This is being done at the expense of the poor by influencing the policy that government institutions introduce‚ vote on and implement. The lobbyist’s underlying agenda is to try and change the relationship between the workers and the owners as well as shift the expectations for government protections that the workers currently have
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The lawsuit alleged that Wal - Mart failed to provide equal employment for women. Seventy percent of the workforce was comprised of females but only a very small percentage of the females were in management positions. “Wal - Mart is the nation’s largest employer of women but‚ unfortunately they are being treated without dignity and respect.” (Barbaro & Joyce‚ 2005). The “good old boy” culture that was established by Sam Walton did not condemn managers who perceived that female employees could
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U.S. Trade Deficit With China Overview The United States international trade has been thriving over time. As of December 2012‚ Canada (total trade with U.S. was $616.7 billion)‚ China ($536.2 billion)‚ Mexico ($494 billion)‚ Japan ($216.4 billion)‚ and Germany ($157.3 billion) are the top five trade partners of U.S. In which the closest trade relationship of U.S. is with China (United States Census Bureau.) The United States has been trading with the People of Republic of China for a long
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Determining The Percent Copper and Zinc in Pennies From Density Purpose: Practicing determine the density of the solution. Developing the method for determine the percent of density for the solution. Examining the linear relationship by learning to use the best-fit straight line. Using the linear relationship to determine the percent of density by the solution. Be familiar with recording data and observations. Methods & Material: Methods: Weight the mass for the different percent of zinc and
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Purpose: To find out the percent yield of copper in the reaction between copper sulfate (CuSO4) and Iron (Fe). Materials: Balance 100-mL beaker 250-mL beaker Bunsen burner Copper sulfate crystals Glass stirring rod 100-mL graduated cylinder Iron filings Ring stand and ring Wire gauze Procedure: 1. Record mass of clean 100-mL beaker. 2. Add 8.0 grams of copper sulfate crystals to beaker. 3. Add 50.0 milliliters of distilled water to the crystals. 4. Put wire gauze on ring on ring
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Down with the Top Ten Percent Many colleges try to have a racially diversified environment by using affirmative action. Some colleges used the point system which would give an edge to minorities over Caucasians. The supreme court of Texas prohibited colleges to use affirmative action. When affirmative action was prohibited‚ minority enrollments at colleges decrease. To racially diversify colleges‚ Legislature passed the top ten percent rule. The top ten percent rule states any high school
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H_2 The purpose of this experiment is to determine the mass % of through the Volumetric Analysis method. To attain this purpose‚ a decomposition reaction was performed‚ which can be separated into two steps. First‚ 2 mL of was reacted with approximately .5 g of KI in an Erlenmeyer flask to form and a hypoiodite species. The second step is the reaction between another molecule of and hypoiodite‚ which results in reformation of the catalyst‚ potassium iodide. The catalyst is used to speed up
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DEBATE: TRADE DEFICITS ARE BAD Position Statement: The trade deficit drains money from our economy‚ lowers our wages and forces us into an ever-lower standard of living. A trade deficit occurs when the total imports of goods and services are greater than the total exports of goods and services. The trade deficit not only drains the economy jobs‚ it sends essential pieces of our industrial ecosystems out of the country. And this means that it is sending our ability to make a living in the
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In the data table above‚ the mass of penny‚ copper‚ and zinc was needed in order to determine the percent composition of copper and zinc. The mass of penny was taken on the scale in the beginning of the procedure before anything was done to the penny‚ and it was 2.51 grams. After the reaction with the hydrochloric acid and drying the copper‚ the mass is 0.35 grams. To get the mass of zinc‚ the mass of the penny was subtracted by the mass of copper. The mass of zinc is 2.16 grams. The penny is 14%
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