again receive electrons and plate that metal. Lemon Cell While there are many electrolytes which will cause this reaction‚ citric acid is frequently used as a demonstration because it occurs naturally in citrus fruits. The two metals often used are zinc‚ as in a galvanized nail‚ for the anode and copper‚ as in a penny‚ for the cathode. A lemon can be used as both the container and the source of citric acid. If a slit is made in one end of the lemon‚ the penny can be inserted about half-way. A galvanized
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blue Part V: Formation of copper metal Weight of Zn added: 1.107g *The professor also added some mossy Zinc. Weight unknown. Observations of copper (II) sulfate when 1.107g of Zinc was added: The solution turned from blue to cloudy dark blue-ish. With continued stirring it turned a dark red-brown. The reaction was not happening properly‚ so the professor added a small pinch of mossy Zinc. Part VI: Recovery of copper metal Weight of dry casserole dish: 59.608g Weight of cooled casserole
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Effect of Particle Size solid zinc‚ approx. 0.5 cm × 2 cm‚ or solid marble chips zinc powder or calcium carbonate powder balance 2 test tubes 1M HCl (approx 10 mL per group) Part 2. Effect of Temperature 3 Alka Seltzer tablets 3 250-mL beakers water at three temperatures – with ice‚ room temperature‚ warm (around 70°C) Part 3. Effect of Concentration 1M HCl‚ 5 mL per group 3M HCl‚ 5 mL per group 6M HCl‚ 5 mL per group 3 pieces of zinc metal‚ each approx 1 cm × 1 cm 3 test
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Reaction Criteria Assessed: Background Design Research Question What is the enthalpy change between the reaction of Zinc reducing Copper II ions? Purpose Determine the change in enthalpy for the redox reduction of zinc reducing Copper II ions. Independent Variable Dependent Variable The change in temperature Controlled Variables Materials/ Apparatus * Zinc powder * 2‚ Foam cups * 10 cm3 pipette * stopwatch * 1.00 M Copper II Sulfate * Scale * Scoop *
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How Batteries Work TOPIC: Explanation of how batteries work SPECIFIC PURPOSE: To inform the audience how a battery works on a scientific level THESIS STATEMENT: A battery is essentially a can full of chemicals in which chemical reactions take place to allow for the flow of electrons. Introduction I. Batteries are everywhere. They are in our cell phones‚ our flashlights‚ our cars‚ our laptops. (Attention getter) II. Life as we know it is made possible largely by batteries. III
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Company in … Fletcher Mine and Mill is an active lead-zinc mine located near 75‚ Missouri. It has 168 employees and is operated by The Doe Run Company. Hafna Lead Mine Ruins. The Hafna Lead Mine mill was … Hafna Lead Mine Ruins. The Hafna Lead Mine mill was built in 1879 but the quarry dates back to an earlier period. Wales. 5 m. Ore bins Brushy Creek Mine/Mill (Active)-The Doe Run Company … Brushy Creek Mine/Mill is an active lead-zinc mine located near Reynolds‚ Missouri. It has 139 employees
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the Cu-Zn voltaic cell used in the experiment. Zinc has higher reactivity and it is more likely to loss electrons. Thus‚ electrons flow from Zn electrode to Cu electrode. Copper stripe is the positive electrode. Zinc stripe is the negative electrode. Reaction happened on each terminal: Positive terminal: Zn-2e-→Zn2+ Negative terminal: 2H+2e-→H2 It is assumed that bubbles (hydrogen gas) will come out from copper electrode. It is assumed that zinc and copper stripes are pure. Classification of
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e– Ag(s) Overall equation: Fe(s) + 2Ag+(aq) Fe2+(aq) + 2Ag(s) b Oxidation: Mg(s) Mg2+(aq) + 2e– Reduction: Cu2+(aq) + 2e– Cu(s) Overall equation: Mg(s) + Cu2+(aq) Mg2+(aq) + Cu(s) c No reaction. Iron cannot displace the more reactive zinc from solution. d Overall equation: Cu(s) + 2Ag+(aq) Cu2+(aq) + 2Ag(s) Review Exercise 9.2 1 a –2 b 0 c +4 d +6 e +6 f –2 2 a NH3‚ ammonium salts b N2 c N2O d NO e HNO2‚ N2O3‚ nitrites f HNO3‚ nitrates 4 a Cr2O72–(aq) + 8H+(aq) +
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Title “ The Effect of Various Metal Activity (Zinc (Zn)‚ Magnesium (Mg)‚ and Copper (Cu)) in the Color of Rainwater and Amount of Rust in the Iron Nail “ Hypothesis If the type of metal that has the highest activity will be used ‚ then there will be the least amount of rust found in the nail and the color of the rainwater would be the lightest. Independent Variable • Types of metals used in wrapping Title: “ The Effect of Various Metal Activity (Zinc (Zn)‚ Magnesium (Mg)‚ and Copper (Cu)) in the
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transportation equipment; roofing; chemical and pharmaceutical machinery; and alloys (brass‚ bronze and beryllium alloyed with copper are particularly vibration resistant); alloy castings; electroplated protective coatings and undercoats for nickel‚ chromium‚ zinc‚ etc. More recently copper is being used in medical equipment due to its anti-microbial properties. The United States has mines in Arizona‚ Utah‚ New Mexico‚ Nevada and Montana. Leading producers are Chile‚ Peru‚ China‚ United States and Australia
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