sodium carbonate and calcium chloride and they form a solid precipitate. Then we poured it a funnel with a filter paper to get the solid precipitate. Purpose ● The purposed of the lab is to lets us student know if we know how calculate the percent yield of a double displacement reaction while using the grams that we get from our lab. Objectives ● We need to know the solid precipitate that had been formed in the
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Design an experiment to investigate the stoichiometric mole ratio of a chemical reaction. Present your data in terms of the mass of one reactant compared to the mass of one product. Purpose: The experiment will be designed to find out the stoichiometric mole ratio of Barium Chloride and Silver Nitrate yielding a precipitate of Silver Chloride in a Barium Nitrate solution. (BaCl2 + 2AgNO3 -> Ba(NO3)2 + 2AgCl) Research Question: How will the amount of Barium Chloride and Silver Nitrate
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experiment is to convert carbonyl compounds to alkenes using Wittig reaction. In this case we will be synthesizing Trans-9-(2-phenylethenyl) anthracene from benzyltriphenylphosphonium chloride and 9-anthraldehyde. We will also aim to obtaining a high percent yield and purity for the synthesis of Trans-9-(2-phenylethenyl) anthracene. The mechanism for this reaction goes thus: Experimental: Benzyltriphenylphosphonium chloride (0.201g) and 9-anthraldehyde (0.116g) were weighed
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Theoretical Yield C4H9OH + NaBr -------> C4H9Br + NaOH From 1-Butanol 20mL (butanol) x 0.810g (butanol) x 1mole (butanol) x 1mole(bromobutane) x 137.03g(bromobutane) = 29.95 g of 1bromobutane 1.00 mL(butanol) 74.12g(butanol) 1mole(butanol) 1mole (bromobutane) From NaBr 27g (NaBr) x 1mole (NaBr) x 1mole (bromobutane) x 137.03g(bromobutane) = 35.95 g of 1bromobutane 102.91g (NaBr) 1 mole (NaBr) 1mole (bromobutane) % Yield = 4
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Stock Market Prices Do Not Follow Random Walks: Evidence from a Simple Specification Test Andrew W. Lo A. Craig MacKinlay University of Pennsylvania In this article we test the random walk hypothesis for weekly stock market returns by comparing variance estimators derived from data sampled at different frequencies. The random walk model is strongly rejected for the entire sample period (19621985) and for all subperiod for a variety of aggregate returns indexes and size-sorted portofolios. Although
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Introduction Aromatic compounds‚ which are planar cyclic rings with (4n+2)π electrons‚ will not undergo simple addition reactions like those of alkyl substances. However‚ in the presence of an electrophile‚ aromatic compounds will undergo electrophilic aromatic substitution. In this type of reaction‚ two π electrons from the aromatic ring serve for the ring to act as a nucleophile and attack an electrophile. For nitration‚ this nucleophile is NO2+‚ which is produced by reacting nitric and sulfuric
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With an interest rate of 6 percent‚ the present value of $100 next year is approximately A) $106. B) $100. C) $94. D) $92. Answer: C 5) What is the present value of $500.00 to be paid in two years if the interest rate is 5 percent? A) $453.51 B) $500.00 C) $476.25 D) $550.00 Answer: A 6) If a security pays $55 in one year and $133 in three years‚ its present value is $150 if the interest rate is A) 5 percent. B) 10 percent. C) 12.5 percent. D) 15 percent. Answer: B 7) To claim
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the first time in history‚ a female candidate with a legitimate chance at becoming president is running for the position. Women are more active in politics than ever before‚ in stark contrast to the 19th century‚ women now make up approximately 53 percent of voters in the United States (According to the 2012 elections). Furthermore‚ statistics show that women’s preferences regarding candidates do not reflect the views of men‚ as the “gender gap” or margin between men and women’s support for a candidate
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today only 3 percent of our labor force produces enough food and fiber to meet domestic needs as well as supplying about 10 percent of total overseas consumption. This huge increase in efficiency has been the result of many factors‚ including use of fertilizer‚ and pesticides‚ introduction of farm machinery‚ development of hybrid strains‚ and increased knowledge about farm management practices. As agriculture has become more intensive‚ farmers have become capable of producing higher yields using less
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1) Chemistry Review Key Terms: empirical knowledge theoretical knowledge law of conservation of mass coefficient chemical amount mole Key Concepts: Write chemical equations when given reactants and products (1.5‚ 1.6) Write balanced chemical equations (2.2‚ 2.3) Interpret balanced chemical equations in terms of chemical amount (in moles) (2.3) Convert between chemical amount and mass (2.4) Classify chemical reactions (2.5‚ 2.6) Predict the solubility of elements and ionic and
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