• Science Project
    “The Solution to the Dirty Penny Resolution” Hypothesis I know that pennies are made from copper. I think the best solution that will clean the penny will be the salt and vinegar because it contains acid, which is best to use when cleaning copper. Materials * Dish Detergent and water...
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  • Copper and Zinc Composition Percentages in Pennies
    caused by various sources of error such as inaccurate measurements of the solutions, contamination of the penny, and improper cleaning of cuvettes. According to the procedures, measurements of nitric acid, dilutions of copper concentrations, and stock solutions all had to be completed. Any deviation...
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  • Cleaning Coins
    not only protect the coin but it will help give the coin a finish at the end of the cleaning. For gold coins, soaking in very hot soapy water works the best. For old pennies, soak the coin in vinegar for at least 24 hours. For bronze coins — usually ancient coins — soak in distilled...
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  • Demonstrations in Chemistry Classes
    can dip some greenish pennies that need cleaning into the liquid for 10 to 20 seconds only, and then we’ll see a big difference in the pennies. Pennies get greenish over time because the copper in the pennies slowly reacts with air to form copper oxide. “Pure copper metal is bright and sparkly, but...
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  • Research Paper
    , lemon water and salt water. To get started, the metal contents should be established. Today’s pennies are mostly made of zinc with a thin layer of copper overcoating. A nail is a form of carbon steel or black iron. Paper clips are made from a low grade steel. A...
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  • Chromotography Lab
    . copper wire, copper penny), aluminum ( aluminum nail, aluminum pan, aluminum soda can), glass (e.g. glass bottle), piece of chalk, wood (e.g. Popsicle stick), hammer, pencil lead, string, tooth pick, rubber band.. IV. Procedure / Observations: Absorbency: Dip a piece of paper towel in the...
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  • Essay
    World War II pennies were made of steel and zinc instead of copper and women were working at jobs that men had always been hired to do. Why? Because during war times, scarcity forces many things to change 12. A good or service is considered to be highly elastic if a slight change in price leads to...
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  • Solar Cells
    want for just pennies. ( Cover your entire roof with them. You will have more energy than you will ever need. You can then make money selling electricity back to the electric company which should pay for it self in one to two years. The most expensive part is the deep cycle marine batteries and your...
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  • Paper
    commercial foodservice frying are actually working to break down your frying oil all the time. -3- The enemies of frying oil 1. Air 2. Heat 3. Moisture 4. Food particles 5. Trace metals 6. Cleaning agents Simple exposure to air oxidizes frying oil. It is important to keep fryer wells covered...
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  • Otec
    use an angled or splayed light shaft between the roof and the ceiling. Marking the Corners we'll want to be able to find the corners of the opening when we go up on the roof. Drill a hole at each corner and drive a 16-penny nail (20-penny for a shake roof) through each hole. Opening the Roof...
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  • Awesome
    observed. What substance seemed to come from the copper sulfate crystals? 3 Place the test tube in the rack to cool. Check with your teacher about emptying and cleaning the test tube. ✍ ✍ copper sulfate crystals hottest part of flame Warning: When heating liquids use a small flame and...
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  • Dfdfd
    The United States Mint · About The MintYou can read more about the rare, collectible 1943 copper penny in ... That made the metal composition of the cent 95 percent copper and 5 percent zinc. ... www.usmint.gov/about_the_mint/fun_facts/?action=fun... - Cached - Similar Percent Mass Of Copper In a...
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  • Chemistry
    February 8, 2012 Chemistry Percent Copper in Post-1982 Pennies Lab Purpose: The purpose of this lab is to determine how much copper is in a post-1982 penny. Background: Before 1982 pennies were made of pure copper. The price of copper went up and the metal value of a penny was worth more...
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  • Composition of Penny Using Redox Reactions
    the gain of electrons of hydrogen or the loss of oxygen or decrease in oxidation state. If zinc completely reacts with HCL, then the theoretical yield of copper should be equivalent to the actual yield. Purpose: In this lab, we will determine the percent composition of a modern (post-1982) penny...
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  • Lab Report
    This lab report will be detailing the steps taken and the results discovered when using spectrophotometry to determine the percentage of copper in a copper-clad penny and the thicknes of the copper layer on the copper-clad penny. After 1982, copper coating has been used in the creation of the penny...
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  • Spectrophotometric analysis of a penny
    of copper in a copper-clad penny, and to determine the thickness of copper layer on the copper-clad penny. Introduction: In the spectrophotometric analysis of a penny lab, we will be conducting three experiments. The purpose of the first experiment is to find the maximum absorbance on the...
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  • History of a Penny
    minted the drachma minted the denarius. The novus denarius was based on the denarius and the penny was based on the novus denarius. Now these were all silver coins though pennies eventually were minted from copper. From there, the history of the penny can be shown to be perhaps as old as the first...
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  • Chemistry- "Pennium" Lab Report
    1982 pennies were one isotope of pennium, and the post 1982 pennies were another isotope of pennium. The mass of the pre 1982 pennies was different from that of the post 1982 pennies because after 1982, pennies were made with more zinc instead of copper, and zinc has a lower density than copper...
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  • Lab report
    OLD COINS TURN TO GOLD DESIGN: Problem or Research Question: How does zinc effects the color change in a copper penny? Hypothesis: If copper and zinc comes together, then it will form brass, which gives gold color to copper penny. Variables: There were no variables at this experiment...
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  • Penny Lab Report
    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...
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