oxidation has occurred (electrons have been lost); if the oxidation number decreases‚ reduction has occurred (electrons have been gained). MnO4¯ + 8 H+ + 5e¯ → Mn+² + 4 H2O (1) In the above reduction half-reaction‚ manganese has undergone a decrease in oxidation number from +7 to +2. In the following oxidation half-reaction‚ each iron atom has undergone an increase in oxidation number from +2 to +3. Fe+²→ Fe+³ + e¯ (2)
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Table 8.1- Combustion of magnesium ribbon Observations Reaction was exothermic; magnesium ribbon burned and was glowing a bright white color when ignited. Reactants: Mg and O2 Products: MgO Balanced chemical equation 2Mg + O2 2MgO Table 8.2- Combustion of heptane Observations When holding test tube inverted over heptane flame‚ condensation formed against top walls of the test tube. When the burning splint was added the walls of the test tube became less foggy from the condensation
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Determination of the Composition of Cobalt Oxalate Hydrate Experiment 12 Robbie Kinsey Partner: Debnil Chowdhury Chem. 1312-D TA’s: Russell Dondero & Sylvester Mosley February 9‚ 2000 Purpose The purpose of this lab was to determine the percent cobalt and oxalate by mass‚ and with that information‚ the empirical formula for cobalt oxalate hydrate‚ using the general formula Coa(C2O4)b.cH2O. Procedure The powdered cobalt oxalate
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Thermal Physics Why a Gas Exerts a Pressure Consider the molecules of a gas moving at random in a container‚ as shown below. The molecules are continually colliding with each other and with the walls of the container. (On the diagram‚ only a few paths of molecules have been drawn because...it’s a bit tedious drawing them!) It is assumed that all collisions are elastic. (Consider what would happen if the collisions were not elastic.) When a molecule collides with the wall‚ a change of
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(Purple pink in (Colourless in solution) solution) The manganate ion (MnO4-) is reduced to a colourless solution of manganese ion (Mn2+). As a result from this reaction‚ the glucose is oxidized (Kolej Mara Banting – Students’ Handbook for Biology HL Year 1). The time taken for the potassium permanganate to change colour from purple pink to colourless is directly related
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chromium Cr+3 form is less than hexavalent chromium Cr+6 form ( Pandey and Sharma‚. 2003). Hexavalent chromium is converted to trivalent chromium when it reacts with matter of organic nature‚ Fe (II)‚ and sulfides and this is facilitated by the manganese oxides. (Becquerel et al‚ 2003). Hexavalent chromium is easily available for living organisms because it is more soluble in water than trivalent chromium (Shrivastava et al‚. 2002).Plants can grow well when there is less amount of chromium in the
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Integrated Reasoning NEW! IR 新题 Integrated Reasoning (50 新题) 1 IR 新题 1、 2、 2 IR 新题 4. 5、 3 IR 新题 4 IR 新题 7、 8、 5 IR 新题 文章： 6 IR 新题 10. 11、 7 IR 新题 文章： 8 IR 新题 13、 9 IR 新题 14、 16、 10 IR 新题 17、 19. 文章： 11 IR 新题 20、 12 IR 新题 21、 13 IR 新题 22、 14 IR 新题 23、 15 IR 新题 24、 16 IR 新题 25、 25A. The least possible value for
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Wear 255 (2003) 1359–1368 Experimental analysis and optimisation of tool wear in dry machining of aluminium alloys M. Nouari∗ ‚ G. List‚ F. Girot‚ D. Coupard Ecole Nationale Supérieure d’Arts et Métiers‚ Centre d’Enseignement et de Recherche de Bordeaux‚ Laboratoire Matériaux Endommagement Fiabilité et Ingénierie des Procédés‚ Esplanade des Arts et Métiers‚ 33405 Talence Cedex‚ France Abstract In machining‚ coolants and lubricants improve machinability‚ increase productivity by reducing
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Hinkley v. PG&E Hinkley is located in the Mojave Desert‚ near the town of Barstow‚ California. It is not far off the famous Route 66‚ about 150 miles from Las Vegas. Surrounded by beautiful scenery‚ Hinkley is an important point on PG&E’s natural gas pipeline as it travels from Texas to California. PG&E lied about the type of chromium they were using‚ their chromium was poisonous‚ and lies were told to the community saying that the chromium being used was actually good for them. A little town in
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Period 1 11/7/13 Chapter 35 Discussion Background: Potassium permanaganate is widely used as an oxidizing agent in volumetric analysis. In acid solution‚ MnO4- ion undergoes reduction to Mn2+ this is the equation: 8H+(aq) + Mno4-(aq) + 5e- Mn2+(aq) + 4H2O Since the KMnO4 – ion is violet and the Mn2+ ion is nearly colorless‚ the end point titrations using KMnO4 as the titrant can be taken as the first pink color that appears in the solution (and stays without disappearing).
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