33 g Mass of beaker plus copper 69.43 g Actual yield of copper 2.1 g Expected yield of copper 2.54 g Percent yield of copper -17.32% Calculations: Actual yield of copper = 69.43 g - 67.33 g = 2.1 g Percent yield of copper = 2.1 g Cu - 2.54 g Cu 2.54 g Cu Conclusion: The percent yield of copper is
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------------------------------------------------- ABSTRACT ------------------------------------------------- The copper reaction experiment was demonstrated by adding the reagents like 16M HNO3‚ Distilled water‚ 6M NaOH‚ 6M H2SO4‚ Acetone‚ Zinc metal and Methanol into the beaker with the copper wire. The experiment was also demonstrated to observe how copper reacts while different reagents were being added. It was also demonstrated to practice the common laboratory techniques such as methods
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presence of more oxidizing agents strong enough to react with the iodide. The copper concentration of an unknown copper sample was determined using iodometric titration. The first part of the experiment involved the preparation of the working standard Cu(II) solution of specific concentration from CuSO4•5H2O. A standard sodium thiosulfate (Na2S2O3) solution was also prepared to serve as the titrant for the analysis. Proper handling should be administered for this solution since it decomposes into its
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Copper‚ Cu Lead‚ Pb Zinc‚ Zn Magnesium‚ Mg The following solutions: Copper (II) nitrate‚ Cu(NO3)2 Lead (II) nitrate‚ Pb(NO3)2 Zinc nitrate Zn(NO3)2 Magnesium nitrate‚ Mg(NO3)2 Silver nitrate‚ AgNO3 Fine sandpaper Goggles Lab apron Directions: Fill in your observations from the videos and pictures in the table below. DATA TABLE Aqueous Nitrates Metals Mg(NO3)2 Zn(NO3)2 Cu(NO3)2 Pb(NO3)2 AgNO3 Mg Zn Cu
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ELECTROLYSIS Electrolysis decomposition of compound using electricity Electrolyte an ionic compound which conducts electric current in molten or aqueous solution‚ being decomposed in the process. Electrode a rod or plate where electricity enters or leaves electrolyte during electrolysis. Reactions occur at electrodes. Discharge the removal of electrons from negative ions to form atoms or the gain of electrons of positive ions to become atoms. Anode
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MARKS: 150 TIME: 3 hours This question paper consists of 16 pages and 4 data sheets. INSTRUCTIONS AND INFORMATION |1. |Write your centre number and examination number in the appropriate spaces on the ANSWER BOOK. | | | | | | | | | |Answer ALL the questions
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Determining the composition of pennies with redox reactions Introduction: The understanding of oxidation and reduction must be clear to carry out this lab. With the understanding of these concepts we can calculate or hypothesize for the properties of each element or compound. Oxidation involves 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
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Chemistry 101 Chapter 4 Practice Test February 2013 1. A 20.0-g sample of HF is dissolved in water to give 2.0 102 mL of solution. The concentration of the solution is: a) 1.0 M b) 3.0 M c) 0.10 M d) 5.0 M e) 10.0 M Ans: d) 5.0 M Page: 4.3 2. Which of the following aqueous solutions contains the greatest number of ions? a) 400.0 mL of 0.10 M NaCl b) 300.0 mL of 0.10 M CaCl2 c) 200.0 mL of 0.10 M FeCl3 d) 200.0 mL of 0.10 M KBr e) 800.0 mL of 0.10 M sucrose ANS:
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edition of the C3. This was also the first time that a Corvette was used as a Pace Car for the Indianapolis 500.[26] Engines and chassis components were mostly carried over from the C2‚ but the body and interior were new. The 350 cu in (5.7 L) engine replaced the old 327 cu in (5.36 L) as the base engine in 1969‚ but power remained at 300 bhp (224 kW). 1969 was the only year for a C3 to optionally offer either a factory installed side exhaust or normal rear exit with chrome tips. The all-aluminum ZL1
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STK 1084 Inorganic Chemistry I‚ LU 3 Oxidation – Reduction Reactions‚ Prepared By: Dr. Tay Meng Guan‚ Faculty of Resource Science and Technology‚ Universiti Malaysia Sarawak. LU 3 Oxidation and Reduction Reactions 3.1 Ideas of Oxidation and Reduction Oxidation of an atom can be occurred in the following conditions: 1. Losing an electron from the orbitals. e.g.: A A+ + e- 2. Adding an electronegative element (e.g.: F‚ Cl‚ Br‚ O) to a molecule. e.g.: A + F AF 3. Losing hydrogen
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