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 PROCEDURES: Materials: Zinc (SN) filling‚ 3M NaOH solution‚ Copper penny‚ tongs‚ Hot plate‚ 100 ml beaker‚ 250 ml beaker‚ Bunsen burner‚ Water‚ Spoon. Procedure: First‚ we turned on the hot plate.
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Experiment three was divided into three parts; the preparation of the solutions‚ the reaction between Hydrochloric Acid and Ammonium Hydroxide (part b)‚ and the formation of Magnesium Oxide (part c). 200 mL of deionized water were added to a beaker followed by the addition of 100 mL 6 M HCl‚ which reacted to make 300 mL of a 2 M HCl solution used for Part B. Next‚ 50 mL of deionized water were added to a separate beaker and then 100 mL 3 M NaOH were added to the beaker to form 150 mL of a 2 M NaOH
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leading to a collection of developmental and physiological conditions commonly grouped as “lead poisoning.” In brief‚ lead acts on small biological systems that affect a major system‚ an example of which are zinc-finger proteins. The zinc-finger‚ a common protein motif‚ relies on the coordination of Zinc (Zn) ions for the protein’s shape and stability; therefore‚ any alterations can affect its shape and‚ inherently‚ its function. In an article by Jacqueline Michelle Ordemann and Rachel Narehood Austin‚
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convert back to the carboxylic acid‚ which is not water soluble. The acid will precipitate from the solution‚ as shown here. RCO2–(aq) + H+(aq) → RCO2H(s) Organic bases (e.g.‚ amines) that are insoluble in water can be separated by extraction with hydrochloric acid. Addition of HCl to the amine produces the corresponding ammonium salt‚ which is soluble in water but not in organic solvents. The amine can be recovered from the aqueous solution by treatment with a base‚ converting the ammonium salt back
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chemical reaction‚ thus‚ of a chemical change. Materials Crucible tongs Evaporating dish Glass rod Test tubes Test tube rack Thermometer Analytical balance Magnesium ribbon pH paper 1M copper (II) sulfate Iron metal 6M hydrochloric acid Procedure Magnesium and oxygen test A small strip of magnesium metal is held on one end with a pair of crucible tongs‚ while the other end is ignited with the flame of Bunsen burner. The burning ribbon is held over a clean evaporating
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type of physical reaction or color changes that occurred. Well#/questions Chemicals Reactions A NaHCO 3 and HCI - C0 2 When combined Sodium Bicarbonate and Hydrochloric Acid‚ Carbon Dioxide is produced. The two chemicals do not undergo a change in color but a chemical change when CO2 is produced. B HCI and BTB When Hydrochloric acid and Bromothymal blue are combined there is a physical change. The combination results in a yellowish tint. This means the byproduct of the two is a base.
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glass Stirring rod Evaporating dish Magnet Magnifying glass Crucible tongs Spatula Balance Meeker burner Ring stand Iron ring Wire gauze Forceps Sulfur Iron filings Sodium Bicarbonate Sodium Chloride Sugar Sand Magnesium ribbon Hydrochloric Acid Distilled water Filter paper 9 disposable dishes Procedure: 1. Label 7 of the dishes with the names of the following products: Sulfur‚ Iron‚ Sodium Bicarbonate‚ Sodium Chloride‚ Sugar‚ Sand‚ and Magnesium. Place small samples of each
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Determination of Trace Amount of Copper and Zinc in an Aqueous Solution by Atomic Absorbance Spectroscopy Abstract: The purpose of this experiment is to analyze a sample containing copper and zinc in trace amounts‚ where standard addition method was used and the instrument used is the atomic absorbance spectroscopy. The amount of copper obtained was 0.569 ppm ± 0.015 and for zinc we obtained 0.42 ppm ± 0.0027. Introduction: This method implies the excitation of particles in the solution sample
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2.496 grams 2. What is the percent copper and zinc in a post 1982 penny? - 97.5 % Zinc and 2.5 % Copper 3. How many grams of copper and zinc are in a post 1982 penny? - (2.496 x 0.975) = 2.43 g of Zinc (2.496 x 0.025) = 0.062 g of Copper 4. How many moles of copper and zinc are in post 1982 pennies? (2.43 g Zn x 1 mol Zn) / 63.38 g Zn = 0.037 mol Zn (0.062 g Cu x 1 mol Cu) / 63.54 g Cu = 0.00097 mol Cu 5. Write a balanced reaction of zinc with HCl. - Zn (s) + 2HCl (aq) ZnCl2 (aq) + H2
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fruits and vegetables) using two strips of metal. The most readily available combination is copper and zinc. The zinc piece can be taken from the casing of an old carbon "D" cell (battery); some zinc coated nails may work as well. The copper can be a coin containing a high amount of copper. (Note: some recent copper coins‚ including the newer U.S. pennies‚ contain low amounts of copper mixed with zinc. If in doubt‚ use a pure copper strip.) They are stuck into the lemon‚ and wires are attached to each
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