Percent Composition of a Penny Background Information: Post-1983 pennies have a copper jacket and a zinc core. We hope to determine the percent composition of these two metals. This will be done by reacting the zinc with hydrochloric acid to form zinc ions in a single replacement reaction. The acid reacts with the zinc but not copper. The reaction of zinc metal with the hydrochloric acid (HCl) produces zinc chloride and hydrogen gas. Safety: Wear your safety goggles and apron If you spill Hydrochloric
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Date Performed: January 10 & 15‚ 2013 Spectrophotometric Determination of the Equilibrium Constant of a Reaction R.J.V. Ortega and J.C.V. Gatdula Institute of Chemistry‚ College of Science University of the Philippines‚ Diliman‚ Quezon City‚ Philippines Received January 22‚ 2013 ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- ABSTRACT -------------------------------------------------
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Displacement is the state in which you are not where you belong. The time‚ the place or with whom you are can greatly affect how you feel‚ given that humans seem to always lean towards their comfort zone. In The Awakening‚ a novella written by Kate Chopin‚ the protagonist‚ Edna Pontellier‚ is a displaced person in the Creole world. She feels uncomfortable and out-of-place amongst the Creole women on Grand Isle because of their different cultures. Edna also seems to be ahead of her time‚ as she submerges
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Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy D. F. Nachman 6/23/2010 Abstract: An ice calorimeter was used to study the reaction of magnesium metal and 1.00M sulfuric acid solution: Mg(s) + H2SO4(aq) →MgSO4(aq) + H2(g). We found the experimental molar enthalpy of reaction to be ΔH = –355 ± 17 kJ/mol at 0°C‚ 24% lower than the textbook value of ΔH° = –466.9 kJ/mol‚ reported at 25°C. Introduction Whether a chemical reaction occurs spontaneously or is driven by an outside
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Purpose The purpose of this experiment is to observe a redox reaction and understand what it means. We will observe the new bonds formed and the importance of the electron in the formation of these new bonds. Materials Boileezers (boiling chips) Desiccant 0.17M acetic acid (acidified water) Solution of Sodium thiosulfate Granular zinc Iodine crystals Zinc ion and iodine-iodide-triiodide ion in water Solid zinc iodide Mineral oil Silver nitrate Magnesium turnings 3M Hydrochloric acid (HCl) solution
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April 10‚ 2013 The Penny The use of pennies is steadily declining. Most people don’t even keep track of the amount of coins they have‚ so it’s more than likely that they’ll think it’s useless‚ and dispose of it. People would throw away the pennies they have‚ without a second glance. Bit if we all save up our loose change‚ there’s a chance we’d be able to save up to hundreds‚ or possibly even millions of pennies. Pennies are valuable to some people‚ for example‚ coin manufactures (Source
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more revenue than the other because they want to always maximize their revenue as a hotel. There are tools in place to aid in making these tough decisions; a spreadsheet is created with a displacement analysis to ease in this process. Displacement Analysis Spreadsheet Purpose of the Spreadsheet The displacement analysis spreadsheet helps managers see if the hotel’s revenue is being maximized. With this spreadsheet managers can compare the revenue expected by a certain group. By doing this they will
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Percent Mass of Copper in a Penny Introduction The purpose of this lab is to determine the percent mass of Cu in a penny and see if the fabricator that makes the planchets for the government is using the correct amounts of Cu in the pennies. The composition of a standard penny is 97.5% Zn and 2.5% Cu. In the lab we will be using Beer’s Law (A=elc+b where A is solution absorbance‚ e is a constant called molar absorbency‚ l is the length in cm‚ and c is the concentration). Using Beer’s Law in this lab
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CHEM 3281 Experiment Seven Determination Of The Composition Of A Multi-Component Mixture By Spectrophotometric Analysis Objectives: 1.Solid sample handling 2.The composition of a three-component mixture will be assayed by dissolution of the soluble components in water and measurement of their individual concentrations by visible spectrophotometry. Text Reference: Handbook of Instrumental Techniques for Analytical Chemistry‚ Frank Settle‚ editor. Prentice Hall‚ ‚ Upper Saddle River‚ NJ 1997‚ Ch 25
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TITLE: Determination of Riboflavin by using UV-Vis spectrophotometry. ABSTRACT: The amount of Riboflavin in various brand of children multivitamins was determine by using UV-Vis spectroscopy instrument‚ the series of standard of riboflavin was prepared in order to determine the amount of the riboflavin in the sample of children multivitamins. The maximum amount of riboflavin was found in the Champs multivitamin that contains 0.1155 mg followed by Chewies 0.1131 mg and Scott’s 0.0672 mg. OBJECTIVES:
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