purpose was to recover the original amount of copper after series of chemical reactions. Then returning the copper back to its original form. The copper wire originally weighted 1.0099 g‚ but after the copper was transformed into Cu(OH)2 to CuO to CuSO4 and finally into Cu‚ the mass of the recovered copper was 1.1023g; the percent yield was 109%. Since the percent yield is more than 100%‚ an error must have occurred somewhere in the lab. A possible error could have occurred due to removing the evaporating
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Finding the percentage of copper in brass alloy. Introduction This is an investigation to find out how much copper is in a brass alloy. The brass alloy we are experimenting on is called Muntz Metal. Muntz metal is 60% copper‚ 40% zinc and a hint of copper [http://en.wikipedia.org/wiki/Muntz_metal] (accessed 4/10/12). Muntz metal was developed as an alternative to expensive‚ heavy copper. It is comprised of about 60% copper and about 40% zinc‚ with a small amount of iron. The finished product actually
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EXPERIMENT NO. 4 Chemical Equilibrium Claver‚ L. Z. X. Y.1‚ Palad‚ C. C.2‚ Rocha‚ R. D. P3 1Anthropology Department‚ College of Social Sciences and Philosophy‚ 2National Institute of Geological Sciences‚ College of Science‚ 3Department of Food Science and Nutrition‚ College of Home Economics‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines ------------------------------------------------- Keywords: forward and reverse reactions‚ equilibrium constant‚ Le Chatelier’s Principle
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LiCl 0.5 M NaCl 0.5 M KCl 0.5 M K2Cr2O7 96% H2SO4 III. EXPERIMENTAL PROCEDURE 1. Reactions of Cu2+ 10 drops of 2 M NaOH‚ 2 M NH4OH‚ 0.5 M K4[Fe(CN)6] was added in turn order into each of test tube which had contained 10 drops of 0.5 M CuSO4. Record the change solution’s color and precipitate’s existence. 2. Reactions of silver
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level *0281936391* CHEMISTRY Paper 5 Planning‚ Analysis and Evaluation Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters
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reaction will be noticed. Hypothesis: • It is hypothesized the zinc metal will have a precipitation reaction with the solution of copper II sulfate‚ because zinc is more reactive then copper and it could displace the copper ions from the solution (CuSO4). And because of that there is no reaction between copper and the solution of copper II sulfate. Materials: Apparatus: Copper II sulfate Spot Plate Copper Wire Beaker Zinc Spoon Sodium Chloride (NaCl) Paper Towels Waste Petri Dish Gloves Lab
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College Chemistry 1 Lab 16 Oxidation Reduction Lab 16 Introduction: I will learn about redox reactions. Materials and Methods: I placed ten drops of each substance into different wells. Then I took Magnesium and put it in the first one. I put Zinc into the second one. I placed lead into the third and fourth one‚ and put iron into the fifth one. Results: See Table Below. Discussion: I learned about different redox reactions. Questions: A. Sodium
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I‚ Entries 7 and 8). Furthermore‚ the reactions with PPA and Sc(OTf)3 having certain drawbacks such as long reaction time‚ in-efficient yield and highly expensive catalysts and lengthy product separation process. Additionally‚ we have also tested ZnSO4 as catalyst for the same reaction in same reaction condition. This catalyst also fails to obtain good to efficient yield of respective c and ended with 47% yield in 12 h reaction time (Table I‚ Entry
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Subject: Chemistry Topic: The Periodic Table The periodic table is a classification of all the elements based on ATOMIC NUMBER. It is composed of HORIZONTAL PERIODS and VERTICAL GROUPS which contain the elements arranged: *the order of INCREASING ATOMIC NUMBER *in the relation to the ELECTRON STRUCTURE of the atoms *in the relation to their CHEMICAL PROPERTIES (Criteria Used For Placing ELEMENTS in the Periodic Table) 1. ATOMIC NUMBER 2. NUMBER OF SHELLS (PERIOD) 3. NUMBER OF OUTER
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indicates oxidation. A decrease in the oxidation number of an atom indicates reduction. For example: 2AgNO3 + Cu Cu(NO3)2 + 2Ag In this equation‚ on the left side of the equation the Ag has an oxidation number of silver is +1 and on the other side the Ag oxidation number is 0. Since the silver ions decrease in oxidation number‚ reduction is occurring. Similarly on the left hand of the equation the Cu has an oxidation number of 0 and on the side it has an oxidation number of +2. Since the copper ions increase
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