------------------------------------------------- Electroplating Electroplating is a plating process in which metal ions in a solution are moved by an electric field to coat an electrode. The process uses electrical current to reduce cations of a desired material from a solution and coat a conductive object with a thin layer of the material‚ such as a metal. Electroplating is primarily used for depositing a layer of material to bestow a desired property (e.g.‚ abrasion and wear resistance‚ corrosion protection
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Analytical Chemistry Daniel C. Harris: 7-4‚ 8‚10‚12‚16 7-4) A 1.000g sample of unknown analyzed by Reaction 7-2 gave 2.500g of bis(dimethylglyoximate) nickel(II). Find the wt% of Ni in the unknown. 7-8) The man in the vat. Once upon a time‚ a workman at a dye factory fell into a vat containing a hot concentrated mixture of sulfuric and nitric acids‚ and he dissolved! Because nobody witnessed the accident‚ it was necessary to prove that he fell in so that the man’s wife could collect his insurance
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SULIT 1 4541/1 Peraturan Permarkahan CHEMISTRY 4541 Kertas 1 Ogos 2011 BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2011 CHEMISTRY TRIAL 2011 MARKING SCHEME PAPER 1 4541 /1 © Trial2011 Hak Cipta Sekolah Berasrama Penuh http://cikguadura.wordpress.com SULIT SULIT 2 SKEMA KERTAS 1 CHEMISTRY 4541/1 4541/1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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emission line results. Each element has a unique emission spectrum. A metal can be identified if it has a strong emission line in the visible region of the electromagnetic spectrum. Thus when a compound such as NaCl is vaporized in a flame‚ ion pairs are converted to gaseous atoms. Na(g) atoms are excited to high energies‚ and 589nm (yellow) light is emitted as the excited atoms revert to their ground state electronic configurations. Therefore‚ the cation in the unknown substances can
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39. The Viscosity of Liquids After studying the present lecture‚ you will be able to Define viscosity and viscosity coefficient Outline the method to measure viscosity using Ostwald viscometer Determine the average molecular weight of a polymer Determine the surface concentration of 1-butanol in aqueous solution Measure the distribution coefficient of a solute betweenn two solvents 39.1 Introduction Viscosity‚ one of the transport properties‚ arises because of intermolecular attractive and
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The electron transfer reaction between hexacyanoferrate (III) and sodium borohydride resulted in the formation of hexacyanoferrate (II) ion and dihydrogen borate ion which was strongly catalyzed by AuNPs. The redox reaction is described as BH4- + 8 [Fe (CN)6]3- + 3H2O 8 [Fe(CN)6]4- + H2 BO3- + 8H+ The advantage of hexacyanoferrate ion for this redox study is that both oxidation states of iron (+2 and +3) are quite stable with respect to dissociation and hydrolysis and
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Synthesis and Structure of Alcohols Alcohols can be considered organic analogues of water. H O H R O H Alcohols are usually classified as primary‚ secondary and tertiary. H R H OH H primary R R OH R R OH OH R secondary tertiary phenol Alcohols with the hydroxyl bound directly to an aromatic (benzene) ring are called phenols. Nomenclature of Alcohols (Normally any compound’s name which ends in –ol is an alcohol of some sort) IUPAC rules that:
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red solutions that will lead to a possible identity of each red solution. Starting with red solution #1‚ we are able to conclude that there are no nanoparticles in this solution and that is a molecular compound due to the fact that when potassium iodide was added‚ there was no color change and no precipitate formation to indicate that a chemical reaction had happened. Having no color change occur when an ionic compound is added to a solution means that the solution is
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Irritant‚ Flammable 2-chlorobutane 92.57 68 -140 0.870 Flammable‚ Irritant 2-bromobutane 137.02 91 -112 1.250 Flammable‚ Irritant Ethyl Alcohol 46.07 79 -114 0.789 Flammable‚ Irritant Silver Nitrate 169.87 444 212 4.350 irritant Sodium Iodide 149.89 1300 651 3.667 irritant water 18.02 100 at 1atm 0 at 1atm 0.997 none Procedure See Introduction to Organic Laboratory Techniques: A Microscale Approach‚ 5th edition by Pavia‚ Lampman Kriz‚ and Engel pages: 186-189 Experiment 21:
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composition of the solution subjected to electrolysis in polarographic cell. * Decomposition Potential and Overvoltage: - When a solution of metal salt is subjected to electrolysis the metal ions migrate towards cathode due to electrostatic attraction and undergo reduction at the cathode. Mn+ + e- M “The minimum potential that must be applied to a cell to bring about continuous electrolytic decomposition is called decomposition potential
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