to your favorite music. We made a simple battery out of a potato by placing in it a zinc strip and a copper strip. At the zinc strip‚ the acid dissolves the zinc freeing electrons. At the copper strip‚ the acid uses those electrons to form hydrogen gas. Because the zinc strip frees electrons and the copper strip uses electrons‚ if you put a wire between the two strips‚ then electrons will flow from the zinc to the copper. This is electrical energy. The flow of electricity is called an electrical
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acidic solution. Copper and Zinc work well as the metals and the citric acid content of a lemon will provide the acidic solution. Batteries like this will not be able to run a motor or energize most light bulbs. It is possible to produce a dim glow from an LED. The picture at the top of this page shows a basic lemon battery‚ a lemon‚ copper penny and zinc coated nail. The lemon: A large‚ fresh‚ "juicy" lemon works best. The nail: Galvanized nails are coated in zinc. I used a 2" galvanized
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Tentative Syllabus HUNTER COLLEGE OF THE CITY UNIVERSITY OF NEW YORK CHEM 106 Sec: GENERAL CHEMISTRY I LAB Instructor: Emral Devany Tel: Email: edevany@hunter.cuny.edu Required texts: 1) 106 Lab Manual from Hunter Bookstore (10th Edition only) 2) Carbon Copy Lab Notebook Class Time: Mo- Wed 2:10-5:00 pm Room: Office: 1406C
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using HCl a strong acid to dissolve all the zinc inside the outer copper shell. The reaction follows as such; Zn+2HCLZnCl2+H2‚ but there will be no reaction with copper. The portion that will be measured is the mass of copper left after all of the Zn goes through the reaction process. Hypothesis: If the penny is post-1983‚ then there will be a percent yield of copper greater than 30%. Research Question: What is the percent composition of Copper and Zinc in a post-1983 penny? Aim: The purpose
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_____________________________CORRTECH CATHODIC PROTECTION FOR PORT FACILITIES _____________________________CORRTECH Contents • • • • • • What causes corrosion What is CP and how does it work? Galvanic vs. impressed current Electrolytes (or where can I use CP) Marine applications Condition assessments _____________________________CORRTECH What is Corrosion? Corrosion is defined as the degradation of a material due to a reaction with it’s environment. Metals require energy to process
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reacts to oxygen and makes a rust proof film (zinc). When iron is coated in zinc it’s commonly known as galvanization. Galvanizing iron is one of the most commonly used techniques of preventing rust. The Zinc around the iron reacts faster and more with the oxygen in the environment then the iron does‚ thus creating a small film around the iron‚ blocking from contact with oxygen. The 4 metals that are being used in our experiment are common Steel‚ Zinc coated Iron (galvanized)‚ Copper‚ and Aluminium
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and Testing for Hydrogen Gas Felicity Tyler Aim: To produce and test for hydrogen gas. Materials: * rubber stopper * dilute hydrochloric acid (HCI) * zinc pieces (Zn) * test-tube rack * matches * dilute sulphuric acid (H2SO4) * 2 cm strips of magnesium ribbon (Mg) * Iron pieces (Fe) * Test-tube Method 1. Test the different metals with the acids by separately combining each
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of brass‚ steel and solder and 2 other alloys of your choice‚ and explain how these uses relate to their properties. Brass: The two major metals in brass are copper and zinc. The proportion of the copper to zinc affects the colour of the alloy‚ ranging from a rose coloured alloy to a yellow alloy. The higher the proportion of zinc‚ the greater the hardness and tensile strength of the alloy. Brass can be highly polished and is lustrous which makes it useful for ornamental materials and musical instruments
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Goggles * Nitric Acid * Fume Hood * 400 mL beaker * Tap water * Sodium Hydroxide * 25 mL graduated cylinder * Stirring Rod * Distilled Water * Heater * Tong * Sulfuric Acid * 100 mL graduated cylinder * Zinc * Hydrochloric Acid Observations: 1. Addition of nitric acid to copper: * Solution turns blue * Emits orange gas * Copper Nitrate is formed 2. Addition of sodium hydroxide to copper(II) nitrate: * Blue crystals liquefy
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THE MOLE CONCEPT References : Mohammed and Lambert ( Old Edition) Chapter 11 pg. 107 Mohammed and Lambert ( New edition) Chapter 8 pg 123 Anne Tindale Chapter 10 pg 46 The following topics will be covered : 1. Definition of Relative Atomic and Relative Molecular Masses. 2. Calculation of Relative Molecular Masses 3. Converting Moles to Grams / Grams to Moles 4. Calculation from equations Masses of substances /Volumes of gases / Concentration
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