The Purity and Purification of Solids Melting Points CH-337 Abstract: The purpose of this experiment was to find the eutectic point for the mixture of naphthalene and biphenyl. This was done by measuring the melting point of both pure substances and five mixtures of different ratios. The purpose of the second section was to identify an unknown sample by measuring its melting point and mixing it with two known substances and comparing them. The results suggest that the eutectic point is closest
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The Purity and Purification of Solids Melting Point Lab Introduction: The point of this lab was to determine the eutectic point for the naphthalene biphenyl mixture‚ as well as determining the melting point of an unknown substance by comparing it with two known samples. Melting point is a temperature in which a substance changes from solid state to liquid state. Melting points are used to determine whether the given substance is pure or not. Substances that melt sharply‚ less than 1-2°C indicates
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Copyright © 2014 CBSE-SPOT SUMMATIVE ASSESSMENT II MARCH 2014 CLASS X Maximum Marks: 80 Time: 3 hrs ENGLISH COMMUNICATIVE The question paper is divided into four sections SECTION A SECTION B : : READING : WRITING : 15 MARKS 20 MARKS SECTION C : GRAMMAR : 15 MARKS SECTION D : LITERATURE : 30 MARKS SECTION A READING (15 MARKS) Q1. Read the passage given below and answer the questions 8 marks 1. We readily admit the importance of character building in education. But we take the word “Character”
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terms which go beyond their apparent contradiction to offer complementary affiliations. The characters‚ especially the whisky priest‚ have a dilemma: they live and voice paradoxes and navigate between extremes‚ an example of which is the states of purity and impurity. Impurity is obviously perceptible in the dirty‚ infected and contaminated state of Tabasco characterized by putrefaction and corruption‚ be it material‚ physical‚ political‚ or religious. Theoretically‚ within the conflict between the
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to to strive to be. So what does it mean to be pure and impure? In his writing he explains what it means to be pure‚ how a person becomes/remains pure‚ as well as how purity and impurity are intertwined with one another in reality. All of these things are going to be provided in the following paragraphs. Caillois explains that purity and impurity is not as separated as a person might
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Introductory Experiment: Acetamide Lab Purpose: To observe the cooling curve of: Pure acetamide (ehtanamide) Impure acetamide (Nal added ad an impurity) Procedure: Please refer to next page. Data: Record both qualitative and quantitative observations. Time(Sec.) Pure:Tempt.(*C) Impure:Tempt.(*C) 0 82 72 30 79 71.5 60 77.8 68 90 76.9 65 120 76.2 63 150 76 61 180 76 58.5 210 76 56.5 240 75.9 55.5 270 75.5 55.5 300 75.1 55.5 330 74.9 55.5 360 74.5 53.5 390 74 53.5 420 73.8 51.5 450 73
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Jesus’ cloak‚ which heals her affliction after 12 years of bleeding. According to Susan Haber‚ there are two major feminist camps when interpreting the hemorrhaging woman’s story. The first‚ supported by Marla Selvidge‚ argues that although Levitical purity laws and sexism oppress this woman‚ Jesus--through healing her affliction--alludes to a more egalitarian society in which the woman‚ regardless of perceived impurity or gender‚ would be fully included. The second‚ supported by Mary Rose D’Angelo‚
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impurities are separated from one sample. 4. Using the 4/64 to 6/64‚ the small impurities are now separated. 5. The light impurities are separated using the bates aspirator. 6. Using the same sample‚ the immature grains are separated 7. The percent purity and impurity are calculated. 8. The percent mature and immature grains are calculated. 9. The data is recorded on the worksheet. Results and Discussion Sample calculation formulas: % Large impurities = Grams Large impurity/grams sample(500)
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Results and Discussion – Expt. 3 (Crystallization) Name: Parts A and B: 1. Please comment on the relative purity of your recrystallized salicylic acid (Hint: You should use your empirical data to support your claim). -The Salicylic acid that I obtained had a melting point range around 157-158 degrees Celsius for Part A. For Part B the melting point range was 156-157.5 degree Celsius. Part B‚ I would say the sample is less pure because of the notion that impurities lower the melting point
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The aim of the experiment is to prepare and produce aspirin as pure as possible. I will do this threw preparing the aspirin and purifying the product threw recrystallization. I will then obtain a melting point of my product to get an estimate of its purity. By the end of the experiment the target is to produce aspirin as pure as possible. Apparatus for synthesis of aspirin Materials for synthesis of aspirin * Pear shaped flask * 2.0
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