and observe briefly. Quickly cover the test tube with a cork and after a minute‚ insert a lighted match on the mouth of the test tube. A “Pop” indicates the presence of hydrogen. Pour 5mL of CuSO4 in a clean test tube and add a piece of zinc metal. Let it stand in the rack for five minutes. Pour 5mL of CuSO4 in another test tube. Using a pipette‚ transfer the solution of the first test tube into another clean one. Observe the first one and the fresh one. D. Double Replacement: Pour 2mL of zinc
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exothermic reaction‚ heat is given off to the surroundings; thus‚ temperature of the surroundings will increase. By measuring the change in the temperature and using the formula Q= mcΔT‚ we can calculate the enthalpy change of the reaction. Equation 1: CuSO4 + Zn ZnSO4 Ionic Equation: Zn (s) + Cu2+ (aq) Cu (s) + Zn2+ (aq) MATERIALS/APPARATUS: * 1 insulated Styrofoam cup * Copper(II) sulfate solution * Zinc Powder * 1 Thermometer * 1 Stopwatch * Weighing Boat * Electronic
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Classes of Chemical Reactions Whenever a reaction takes place‚ energy is changed as well when the substances react chemically. Scientists have taken these changes in energy and generalized them. Scientists can take these generalizations and discover more about the nature and tendencies of matter. In this lab‚ the purpose was to perform seven reactions‚ write down their equations‚ and identify the type of reaction. In this lab report‚ several methods of displaying this information will be applied
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Abstract The aim of this study was to test the rate of reactivity of the enzyme catalase on hydrogen peroxide while subject to different concentrations of an inhibitor. The hypothesis was that hydrogen peroxide will be broken down by catalase into hydrogen and oxygen‚ where a higher concentration of inhibitor will yield less oxygen‚ resultant of a lower rate of reaction. Crushed potato samples of equal weight were placed in hydrogen peroxide solutions of various temperatures. The results showed
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precipitate. Materiel needed: Test tubes Rack of test tubes Plastic droppers Beakers Procedure: We prepare 7 beakers of 7 different solutions (that we mark from 1→ 7). We put separately around 50 ml of: HCl NaOH Na2CO3 K2CrO4 CaCl2 CuSO4 Unknown substance Using plastic droppers we mix 10 drops of one solution with 10 drops of another solution in a test tube‚ to get all in all 20 different test tubes. We then note the observation for each test tube. Name of the unknown substance:
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the mass of the empty crucible from the mass of the hydrate and crucible gives the mass of the CuSO4 hydrate. Mass of hydrate = (mass of crucible + hydrate) - (mass of empty crucible) Heat the hydrate. After heating‚ record the mass of the crucible and the dehydrated compound. No calculations for this step Subtracting the mass of the empty crucible from the mass of the crucible and dehydrated CuSO4 gives you the mass of the dehydrated compound. Mass of dehydrate = (mass of the crucible and
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for 3 minutes. 3. Label the 11 test tube A to K‚ each for a different sample A- sand B-Cube of liver C-Cube of potato D-Ground liver E-Ground potato F-Cube of boiled liver G-1 ml HCl + cube of liver H-1 ml NaOH + cube of liver I-1 ml CuSO4 + cube of liver J-1 ml Al(NO3)3 + cube of liver K-1 ml Zn(NO3)2 + cube of liver 4. Grind one piece of potato and liver separately‚ add a pinch of sand to the sample to make the grinding easier. 5. After grinding the sample‚ put it into test
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Copper (II) Sulfate Drops (column2) Sodium Carbonate Drops (Column 3) General Observations- ColourPrecipitate (column4) 119Light BlueLittle 237Medium BlueMedium 355Dark BlueLarge 473Medium BlueMedium 591Light BlueLittle Double Displacement: CuSO4 (aq) + NaCO3 (aq) à
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(hydrochloric acid). Caution: Use extreme care in handling this acid. It will cause severe burns if allowed to come in contact with the skin. Touch the bottom of the test tube with your fingertip. 5. Use a mortar and pestle to grind several crystals of CuSO4 5H20 into a uniform powder. Place one microspatula of the powder into a test tube. Heat gently over a burner flame for 5 minutes. Allow the sample to cool and then add a few drops of water. 6. Using a lab
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signified by the sudden appearance of a blue coloration. Results of the experiment indicated that the rate is first order with respect to each reactant and that the activation energy is high implying sensitivity to temperature. It was also determined that CuSO4 is a viable catalyst for the persulfate-iodide reaction. ------------------------------------------------- INTRODUCTION Chemical kinetics is the study of reaction rates‚ the study of changes in concentration of reactants or products with respect
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