July 14‚ 2009 Experiment 6: Fractional Distillation. Separation of Petroleum Hydrocarbons Abstract: A mixture of cyclohexane and toluene were separate from one another by fractional distillation in order to measure the composition of each fraction and prepare the sample for gas chromatography. Introduction: Distillation has been used since antiquity to separate the components of mixtures. This method has been used to manufacture different organic chemicals but the most recent application
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Chapter 1 Study of Chemistry -Chemistry is the study of matter and the changes it undergoes. It is a very practical science which means that it can be used to determine stuff we do in real life. For example‚ drugs‚ food‚ etc. are made by researching the chemical properties of the substance. -Matter is anything that has a mass and takes up space -Elements are the most basic substances something can be broken down into. There are about 100 elements known to scientists right now. There may be
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reaction for another reaction using Hess’ Law and to determine heats of dissolution for a number of ionic salts that will be used to predict lattice energy again by using Hess’ Law. Heat may increase during experiment and undergo exothermic reaction. Analysis: Q = m c (Tf - Ti) = 27.9°C – 21.3°C = 6.6°C Q = (101.81g)(4180kJ/g°C)(6.6°C) Q = 2808734 kJ Discussion: Measurements were relatively accurate and closely linked to quantitative values. When measurement was a little higher‚ value resulted
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3s2 3p2 4s2 3d2 4p2 5s2 4d1 | 29 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 4p2 5s2 4d2 5p2 6s2 4f2 5d26p1 | 10 | 1s2 2s2 2p2 3s2 3p2 | 20 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 4p2 5s2 4d2 | 30 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 4p2 5s2 4d2 5p2 6s2 4f2 5d26p2 | Part 1 (analysis) 1) In this different universe there is only one orbital of each given type because we are told that ml =1‚ this means that each orbital can have only one orientation in space‚ so instead of 3 p orbitals‚ able to hold a total of 6 electrons‚ you
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NOT FOR ELECTRONIC STUDENT ACCESS ONLY FOR CLASSROOM USE!! Unit 9: Stoichiometry Practice 1. Differentiate between the significance of the coefficients in a balanced chemical equation and the significance of the subscripts in a chemical formula. · Coefficients show the correct proportions of atoms and molecules in a chemical reaction. They are normal sized numbers placed at the beginning of the chemical formulas in a chemical reaction during the process of balancing. They tell how many of an entire
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Heat of Neutralization Introduction: The purpose of this experiment was to measure‚ using a calorimeter‚ the energy changes accompanying neutralization reactions. In order to measure the amount of heat produced by a reaction‚ an instrument called a calorimeter was used. The calorimeter used in this experiment was somewhat rudimentary. It was constructed as shown in the following picture: After finding the heat capacity of the calorimeter‚ the student and partner neutralized two acids and
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CHM138LL Lab 5 Stoichiometry Analysis of a Chemical Reaction Name: A. Data Tables Item Measured/Quantity Calculated Mass (in grams) Iron nails (before reaction) 7.75g 5.5g Iron nails (after reaction) Mass of iron consumed 2.25g Initial mass of filter paper (before filtration) 0.86g 3.52g 2.66g Mass of filter paper and solid product Mass of solid product Show work below for “mass of iron consumed” and “mass of solid formed” calculations: 7.75g-5.5g=2.25g 3.52g-
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The Poem "The Unknown Citizen" by W.H. Auden is a satire. Its narrator is the state. In this‚ the state pays tribute and describes a successful and positive product of its efficiency and effectiveness. In other words‚ it builds the character later described to the reader as "the perfect citizen." The narrator speaks as if he is delivering a speech or common tribute using words and phrases that are familiar to the reader. Using such imagery helps the reader paint a clear picture of the character
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Experiment #4A- A Separation and purification Scheme Amena Alkeswani‚ PHCC Dhanlal Murally‚ PHCC September 27‚ 2012 Abstract: There are millions of different organic compounds. Most of them are found in mixtures and in order to achieve a pure form they need to be separated‚ isolated‚ and purified. However‚ there are endless numbers of possible mixtures‚ which make it impossible to have a pre-designed procedure for every mixture. So chemists often have to make their own procedures. The purpose
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Title: Zinc and Copper II Sulfate Lab Purpose: To determine which mole ratio of Zinc and Copper II Sulfate produces the greatest temperature change in degrees celsius. Background: This experiment will be looking for color change‚ temperature change‚ and precipitation change. Some background knowledge I know is how to balance equations. I also know side effect of a chemical change‚ in this experiment there was a color and temperature change. Other background knowledge is using and applying the
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