BALANCE LAB Introduction The purpose of this lab is to become familiar with how to use the ChemLab program for determining mass using both the centigram balance and the electronic balance. Using the centigram balance‚ the mass‚ in grams‚ of a copper slug will be determined by both direct weighing and weighing by difference techniques. Using an electronic balance‚ the wight of a copper slug will be determined by also utilizing direct weighing and weighing by difference. Average mass of a
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Chemistry 111 – Lab #2 Formula and Composition of a hydrate Purpose of the Experiment: The purpose of this experiment is to provide an opportunity to practice proper heating and cooling techniques and to calculate the formula of a known anhydrous compound and to calculate the percent of water in an unknown hydrate from results. Materials and Methods: Materials used for this experiment included 3 crucibles (with lids)‚ clay triangle‚ ring‚ burner‚ CaSO4.2H2O and one unknown hydrate
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Name: Lab Partners: Experiment Date: 02/09/2013 Due Date: 02/23/2013 Lab Exercise No. 2 Determination of Kc Values Using UV Absorption Objectives * To determine the equilibrium constant for a given reaction * To understand the concept of Le Chatelier’s Principle * To gain experience in the use of a UV Spectrophotometer Background/Concepts * A chemical equilibrium is the state reached by a reaction mixture when the forward reaction and the reverse reaction
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Proportions. In our final lab‚ we took a sample of potassium chlorate and heated it in a crucible to drive off the oxygen. We did this to measure and find the amount of oxygen that was in it. This was to verify the Law of Definite Composition. Aspect 2: In our investigation of the Atomic laws we had some major results in all 3 experiments. In the Conservation of Mass Lab‚ we found that the total combined mass was equal to the original individual masses of the substances. In the Oreo Lab‚ our ratio result
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Post Lab Report Experiment 3 - Chromatography – Analyzing Analgesics by TLC and Isolation of β–Carotene by Column Chromatography Chemicals 1. Acetaminophen (C8H9NO2) 2. Aspirin (C9H8O4) 3. Caffeine (C8H10N4O2) 4. Ibuprofen (C13hH18O2) Introduction In this experiment‚ several analgesics were analyzed by Thin Layer Chromatography (TLC) and the composition of an unknown tablet was identified. We define chromatography as the separation of two or more compounds or ions by
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Emission Spectroscopy Lab Introduction: According to the Bohr atomic model‚ electrons orbit the nucleus in fixed paths with specific energies. Each path is therefore often referred to as an “energy level”. Electrons possessing the lowest energy are found in the levels closest to the nucleus. Electrons of higher energy are located in progressively more distant energy levels. If an electron absorbs sufficient energy to bridge the “gap” between energy levels‚ the electron may jump to a higher
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References: "Historical and International Aspects of the SI." Historical and International Aspects of the SI. Web. 05 June 2012. . Lab Paq Manual. Questions
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AB 109 David Chapman CJA234 November 18‚ 2013 Sidney Hammond AB 109 The prison systems in the world always need to change to support society or the prison systems. Assembly Bill 109 was signed by Governor Edmund Brown Jr. and implemented on October 1‚ 2011 to close the revolving door of low-level inmates cycling in and out of state prisons. It was a way to reduce the number of inmates in the overpopulated prisons. The California criminal justice system is undergoing substantial changes with the
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Courtney Cubine 6/19/13 June 20‚ 2013 Separation of a Mixture of Solids Purpose: The purpose of this experiment was to help the student learn how to separate a mixture of multiple different solids and determine the percentage of each component of the mixture. Procedure: I started off by removing the iron using the magnet‚ and then I weighed all of the iron I obtained from the mixture in a container I already knew the weight of and calculated the net weight of the iron. Next
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Lab 19A Answers: 1) If we increase the molarity of NaOH from 0.1M to 0.2M‚ it will actually take less number of drops in order to change the color of the solution. This is because the more concentrated a substance is‚ less of the substance is needed to cause an equilibrium shift. 2) When you add 6.0M NaOH into the iron (III) thiocyanate ion equilibrium system‚ the concentration of Fe3+ ion decreases. This causes the equilibrium system to shift to the left (reactant) side. This is why the solution
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