Determination Of Water Crystalization Essay Example for Free

Determination Of Water Crystalization Essay I. Aim: To determine the formula of the hydrate of copper (II) sulfate. II. Hypothesis: Hydrates are ionic compounds that have a definite amount of water as part of their structure. The water is chemically combined with the salt in a definite ratio. Ratios vary in different hydrates but are specific for any given hydrate. In this experiment, the hydrate of copper sulfate has the formula CuSO4.xH20. When it is heated, the water is released as vapor and we can describe the reaction as below: Hydrate Anhydrous salt + Salt CuSO4.xH20 CuSO4 + xH20 The amount of water in the hydrate is determined by taking the difference between the mass of the hydrate before and after heated. Then, the percentage composition of water can be calculated basing on its mass. According to usual theory, hydrated copper sulfate has the following formula CuSO4.5H2O. Therefore, the result collected from the experiment should be x = 5. III. Equipment/Chemical: 1. Equipment: * 1 x Evaporating dish * 1 x Pipe-clay triangle * Some crucible tongs * 1 x Pressed fiber pad * 1 x Digital balance (uncertainty: à ¯Ã‚ ¿Ã‚ ½0.001g) * 1 x Spatula * 1 x Glass stirring rod * 1 x Bunsen burner * 1 x Tripod stand 2. Chemical: Hydrated copper (II) sulfate IV. Variables: * Independent: the mass of hydrated salt. * Dependent: the percentage composition of water in the hydrate. * Control: room temperature, capacity of fire gas, standard equipment. V. Method: 1. Clean and dry evaporating dish. 2. Set up a Bunsen burner under a tripod stand with a pipe-clay triangle on top. 3. Place the empty evaporating dish on the clay triangle and heat the dish with the hottest flame for 3 minutes. This is done to be sure that the dish is absolutely dry. 4. Use tongs to remove the dish from the clay triangle and then place it on a pressed fiber pad so that it can cool for several minutes. 5. Use a digital balance to determine the mass of the cooled evaporating dish. Record this mass to the same number of decimal places as the uncertainty of the balance (à ¯Ã‚ ¿Ã‚ ½0.001g), in other words, the measured mass will have 3 decimal places. Remember not to weigh the dish when it is hot because heat waves tend to be circular and upward, which tends to make objects appear to weigh less. 6. With the dish on the balance, put into it a specific amount of hydrated copper sulfate; make sure that the amount of hydrated copper sulfate is less than half full of the dish. Be sure the spatula is very clean to avoid contamination. Record the mass of the dish with the hydrate to the same number of decimal places as the uncertainty of the balance. 7. Place the dish on the clay triangle. Gently heat the dish by moving the burner bark and forth around the base. Increase the heat gradually. Avoid any popping and spattering. 8. Heat strongly for 5 minutes or until all of the blue color has disappeared. During the heating, a glass stirring rod should be used to spread the solid and break up larger portions of the hydrate. Be sure not to pick up any of the solid on the stirring rod. If the edges of the solid appear to be turning brown, remove the heat momentarily and resume heating with a cooler flame. 9. Allow the dish to cool for 2 minutes. Immediately find the mass of the dish with the anhydrous salt, and record the mass to the same number of decimal places as the uncertainty of the balance. The dish must be weighed before the compound reabsorbs water from the atmosphere. 10. Calculate the initial amount of hydrated copper sulfate before heated. Record the answer to the same number of decimal places as its calculated uncertainty. 11. Determine the amount of vaporized water. Record the answer to the same number of decimal places as its calculated uncertainty. 12. Then, the value of x can be found basing on the formula ratio. 13. When finish, the anhydrous salt can be thrown into the waste container and the evaporating dish washed.

Tom Robinson’s Conviction in Harper Lees To Kill A Mockingbird Essays

Tom Robinson’s Conviction in Harper Lee's To Kill A Mockingbird Harper Lee’s To Kill A Mockingbird is an almost faultless representation of how the â€Å"white† word dominated the â€Å"black† word in the South. The novel shows that a white person’s word, no matter how faulted, was more readily accepted than any black person’s word. Allowing a â€Å"Negro’s† word to be accepted over â€Å"white† word would make southern society less secure in its assumed superiority. The southern â€Å"superiority† over Negroes had existed since the time of the slave trade and continued after the emancipation, out of fear. As long as Negroes were considered â€Å"property,† they were protected by their â€Å"value.† Following the abolition of legal slavery, their economic protection vanished, and the southern white population feared their infiltration with society. Out of fear came hate in the white southern community. Organizations reflecting their hate were created, such as the Ku Klux Klan. Lynchings, unjustified convictions, and severe economic oppression were all part of Negro-life in the south between 1925-1935. With the Stock Market Crash in October of 1929 the United States suffered severe economic depression. With the closing of many mills and plants, unemployment skyrocketed. The economic collapse was painful to all communities, but to the blacks of the South who were already severely oppressed, it was devastating. Farming communities, which were already in a depression before the crash, went hungry and rarely had surplus crop to sell for profit. Crop prices fell nearly 50% between 1929 and 1930. During the depression it was nearly impossible for blacks to find work because unemployed whites were chosen over blacks no matter what their qualific... ...ession, and Harper Lee’s To Kill A Mockingbird is an accurate example of how the historic South treated blacks with severe prejudice. Works Cited Carter, Dan T. Scottsboro: A Tragedy of the American South. Baton Rouge: Louisiana State University Press, 1969. Chalmers, Allan K. They Shall Be Free. Garden City: Doubleday & Company, 1951. Lee, Harper. To Kill A Mockingbird. Philadelphia: Warner Books, 1960. Ransdell, Hollace. "The First Scottsboro Trials (April, 1931) ." The First Scottsboro Trials (April, 1931). 27 May 1931. American Civil Liberties Union. 11 March 2001. <http://www.law.umkc.edu/faculty/projects/FTrials/scottsboro/SB_HRrep.html#REPORT ON THE SCOTTSBORO, ALA.>. Vassel, Olive. "The Scottsboro Boys." The Scottsboro Boys. . AFRO-Americ@. 11 March 20001. <http://www.afroam.org/history/scott/scotts.html>.

TED Tallk

In my opinion, all of the videos that I watched was very informative and helpful for a person like me who is still not fully confident when speaking in public, engaging in arguments and when presenting a thesis or a report. Honestly, It's hard to maintain confidence but hearing those strategies on how to face and communicate with people helps me to challenge myself more because I believe that if it doesn't challenge me, it won't change me. In other words, if it doesn't challenge me, it won't improve me. The TEDtallk videos are very inspiring, most of them helped me realize that every one of us is a teacher. Whoever we meet/met has something to do in our lives that can teach and put a big impact on us, especially with those people who are more experienced, with those people who started as an ordinary people to embracing their uniqueness as an individual. I know I'm not the only one who thinks that people who gives advices are the people who fall all over again, life knocked them down so many times but they decided to get up and believes that they must scare their own fears. Why? Because we are bigger than our fears. Look at them, standing in stage, speaking in front of thousands of people because they carry so much lessons that life taught them. This is not from TEDtalk videos but he is one of the best examples on how to embrace our own identity and individuality, his name is Norman King an aeta who graduated from University of the Philippines Manila. I carry some of his words of wisdom in my daily life because I find it powerful and it enlightens me every day, that when you connect to his words you will feel and find the soul of dedicated and a hard-working man who have nothing to lose and who keeps fighting for their rights even though some of aetas have disregarded their culture.

Enlightenment Ideals As Catalysts Of The French Revolution

Aamna Malik Ms. Maize CHY4U1 November 18, 2014 Enlightenment Ideals as Catalysts of the French Revolution â€Å"Man is born free and everywhere he is in chains† (Rousseau 1). These words of the 18th Century philosophe Jean Jacques Rousseau perfectly describe the sweeping turmoil in Pre-revolution France. Freedom as pertaining to underlying societal structures such as social codes, political establishments, and religious institutions was believed by Enlightenment thinkers to be a natural right of man whilst it was seized from the citizens of France by the absolutist monarchy of King Louis XIV. As an absolute ruler, King Louis XIV held all power and was free to exercise it in all aspects of society, be it religion, economy, or law, without fear of resistance or revolt from the public. That is, until the 18th century, when Enlightenment ideals prevailed and the citizens of France were persuaded by various strong leaders and their ideas of reform to overthrow the current societal institutions. This movement is commonly known as the French Revolution. The rampant progression of the Fre nch Revolution was spread through Enlightenment ideals in the Third Estate, the largest demographic of absolute France. Consequently, the Enlightenment ideals of social, political, and religious freedom as manifested in the works of Jean Jacques Rousseau, Francois-Marie Arouet Voltaire, and the Baron de Montesquieu served as catalysts for the French Revolution. Rulers of absolute regimes cameShow MoreRelatedThe French Revolution And The Enlightenment1601 Words   |  7 PagesThe Enlightenment was an extensive intellectual, philosophical, and cultural movement that spread throughout Europe, predominantly England, France and Germany during the 18th century. 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Faust not only expresses the moral contradictions and spiritual yearnings of a man in search of fulfillment, but also portrays the broader mindset of a society that was groping for meaning in a world where reason no longer sufficed as a catalyst for human cultural life. The period of German Romanticism in which GoetheRead MoreRacism - A History : The Color Of Money1063 Words   |  5 Pagesthe slave trade, the concept of racism is rooted in the enslavement and exploitation of Africans for labor and capital gain. The documentary describes how the British’s development of the transatlantic slave trade for colonial America served as the catalyst for racism, not the reverse. As Professor James Walvin, Professor of History Emeritus at the University of York explained in the documentary, â€Å"the British don t become slave traders and slavers because they are racist; they became racist because