with air. Minimizing contact with air assures a better outcome. B. What happens to the zinc in the hydrogen generation experiment? It dissolved and formed hydrogen and zinc chloride. C. What happens to the manganese in the oxygen generation experiment? The manganese seemed like a catalyst because it sped up the rate of the chemical reaction. D. Write a balanced equation for the reaction between O2 and H2. 2H2 + O2 ==> 2H2O E. What is the function/purpose of the bromothymol
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Within the thylakoid membranes of the chloroplast‚ are two photosystems. Photosystem I optimally absorbs photons of a wavelength of 700 nm. Photosystem II optimally absorbs photons of a wavelength of 680 nm. The numbers indicate the order in which the photosystems were discovered‚ not the order of electron transfer. Under normal conditions electrons flow from PSII through cytochrome bf (a membrane bound protein analogous to Complex III of the mitochondrial electron transport chain) to PSI. Photosystem
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solutions of arginine and water. We use colorimetric determination and spectrophotometric analysis as a result of the red colour produced by the solution’s reaction with α-isonitrosopropiophenone (Davis and Mora 1968). Manganese sulphate is added to the solutions as the outer manganese ions in reaction recovered the activity of arginase‚ which was lost in dissolving and dilution of the liver extract (Xie‚ et al. 2004). Perchloric acid is added to the tubes to halt the reaction where arginine is transformed
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Economic Importance of Natural Resources The mineral resources constitute a vast potential wealth of our country and varieties of mineral resources are available in all countries namely; iron‚ manganese‚ mica‚ bauxite‚ gypsum‚ titanium‚ thorium‚ uranium‚ chromium etc.‚. These mineral resources‚ when used‚ in a prudent and judicious manner have the powers to convert a developing country into a developed country. Iron: Iron ore plays a key role in the industrialization of a nation and some developing
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effect at different conditions on the hydrogen peroxide decomposition. Apparatus : Beaker ‚ Water bath (95°C) ‚ Glass rod ‚ Boiling tubes & test tubes‚ pen knife/blade ‚ parafilm Materials : Fresh liver ‚ manganese dioxide ‚ wooden splinters ‚ potato cubes ‚ 10% hydrogen peroxide Procedures : 1. Six clean empty boiling tubes as 1‚ 2‚ 3‚ 4‚5 and 6 is labeled. 2. The rovided liver is cut into three pieces of
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one 1. a) When hydrogen peroxide was added to manganese‚ tiny bubbles formed in the solution- intensity of (1). b)The solution did not change in temperature. c) The bubbles stopped forming after about 18 minutes. 2. After we added 2 more mL of hydrogen peroxide‚ the reaction occurred again. Again‚ small bubbles formed; intensity of (1). The solution did not change in temperature. The reaction lasted about 15 minutes. 3. After adding more manganese dioxide‚ the reaction occurred again. This time
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the physical properties of the metal are altered * steels are alloys of iron‚ with different quantities of carbon and other metals (titanium‚ chromium‚ molybdenum‚ cobalt‚ nickel‚ manganese‚ tungsten) added to create desired properties: * chromium makes steel harder and more resistant to corrosion * manganese makes steel stronger‚ harder and more resistant to wear * silicon makes steel more resilient * molybdenum makes steel stronger and harder at high temperatures‚ less brittle
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EXPERIMENT 11: DETERMINATION OF DISSOLVED OXYGEN IN A WATER SAMPLE (WINKLER METHOD) INTRODUCTION In an alkaline solution‚ dissolved oxygen will oxidize manganese(II) to the trivalent state. 8OH-(aq) + 4Mn2+(aq) + 2H2O(l) －－＞ 4Mn(OH)3(s) The analysis is completed by titrating the iodine produced from potassium iodide by manganese(III) hydroxide. 2Mn(OH)3(s) + 2I-(aq) + 6 H+(aq) －－＞ 2Mn2+(aq) + I2(aq) + 6H2O(l) Sodium thiosulphate is used as the titrant. Success of the method is critically
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physical and chemical properties of gases as well as using those properties to identify the gases. Procedure: * For Hydrogen I placed a piece of Zn metal into a test tube with diluted HCl. * To produce oxygen I added Hydrogen peroxide to manganese. * Next‚ I added baking soda to vinegar. This caused a quick and energetic reaction! The gas from the reaction I pumped into some Limewater. * Then I mixed Alka Seltzer and water and pumped the gas caused by that reaction into some limewater
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Profile Johann is a 66 year old lady living in rural ireland. She lives by herself in a small cottage in the centre of her village. She is within walking distance to two grocery shops‚ a national school‚ a church and two pubs. Her daughter lives on the other side of the village which is within walking distance also. Johann has two daughters and one son that she sees regularly and one son from a previous relationship that she sees occasionally. She was diagnosed with bi-polar (manic) depression at
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