than the weight of the crude caffeine. Explain why the percent recovery is frequently low. • Crude caffeine contains contaminants‚ such as organic compounds‚ while purified caffeine is just pure caffeine. Therefore‚ the weight of the crude caffeine is more than the purified caffeine because of the additional contaminants adds weight. Since there are no additional contaminants to the purified caffeine‚ the percent recovery would be low. The percent recovery would also be low since the caffeine is pure
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Percent Acetic Acid in Vinegar Introduction: Acetic acid is reactive when combined with calcium carbonate. In this lab‚ we will use vinegar for its acetic acid and egg shells for their calcium carbonate. Marketable vinegar differs in its acetic acid concentration from 4-6%. Calcium carbonate reacts with the acetic acid in vinegar to produce carbon dioxide‚ water‚ and calcium acetate as represented by the equation: CaCO3 + 2HC2H3O2 CO2 + H2O + Ca(C2H3O2)2. The calcium carbonate reacts with
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Ninety-Nine The National Hockey League has hosted the finest athletes in which the game of hockey has ever offered. Throughout over a century of history one person has had more of an impact on this league and this game. This man is Wayne Gretzky. Nicknamed "the great one"‚ no player has done more positive for the game of hockey than him. Gretzky holds more records in the NHL than any other player in history‚ which shows his skill. He also holds records for attendance and fan support
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or not‚ it is still unethical. In June of 2001 six former and current female Wal - Mart employees filed a sexual discrimination suit against the company. 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.”
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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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One Direction isn’t an Inspiration? People think that One Direction is just a boy band. They may call them gay. They may call them stupid. They may call them untalented. They may call them idiots‚ but have they ever realized that they aren’t just singers. People don’t see the point in these boys. All they see is the face‚ not the background. All they hear is the music‚ not the lyrics. All they feel towards these boys is hate and dislike. But none of them realize‚ these boys have saved more lives
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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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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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Kimberly Avilez Phil 1301 Genius Aristotle provided the best foundation for the Theory of Forms. Being a pupil of such a great philosopher like Plato and considering the respect and admiration that Aristotle professed to his mentor‚ it had to be a challenge to respectfully provide strongest foundations. Regarding the Theory of Forms‚ Plato and Aristotle both use their definitions of ‘form’ to defeat their relative problems with knowledge. For both philosophers form is able to categorize all
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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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