modifying the temperature‚ modifying the concentration‚ or introducing a catalyst. We will be specifically looking at the effect of concentration of the H2O2 solution rather than the effect of the temperature. We will also introduce a catalyst‚ Manganese(IV) Oxide (MnO2)‚ in order to speed up the reaction so that it can occur‚ however it will be controlled so that we only look at the effect of concentration of H2O2. This will be done by measuring the volume of O2 produced. Research Question
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of Technetium is 5. Its electron shells are 2‚8‚18‚14‚1 as it is in the picture. Firstly‚ Russian chemist Dmitri Mendeleev‚ who is the creator of the periodic table‚ predicted Technetium’s existence. He called it eka-manganese because there was a missing element between manganese and rhenium. However he could not discover it. After long research and big experiments‚ Technetium was discovered in 1937 by Carlo Perrier and Emilio Segre in Italy. (If they could not discover it‚ of course Mr. Machin
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research on heavy metals in our water ways I have come to realize that almost all heavy metals can be found in our rivers‚ streams and drinking water. Aluminum‚ Arsenic‚ Chromium‚ Copper‚ Iron‚ Lead‚ Manganese‚ Nickel‚ Silver‚ and Zinc are all chemical elements. Chromium‚ Copper‚ Iron‚ Manganese‚ Nickel‚ Silver‚ and Zinc which are yellow on the periodic table are considered transitional metals. Aluminum and Lead which are light blue on the periodic table are considered other metals. Arsenic which
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Very important elements for alloy steels are manganese‚ nickel‚ chromium‚ molybdenum‚ vanadium‚ tungsten‚ silicon‚ copper‚ cobalt and boron. All commercial steels contain 0‚3-0‚8% manganese‚ to reduce oxides and to counteract the harmful influence of iron sulphide. There is a tendency nowadays to increase the manganese content and reduce the carbon content in order to get a steel with an equal tensile strength but improved ductility. Nickel and manganese are very similar in behaviour and both lower
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What is molar mass?Molar mass is the weight of one mole (or 6.02 x 1023 molecules) of any chemical compounds. Molar masses of common chemical compounds that you might find in the chemistry laboratory can range between 18 grams/mole for compounds like water to hundreds of grams per mole for more complex chemical compounds.The lightest possible chemical that one can have under normal conditions is hydrogen gas‚ or H2. There is no limit to how heavy a chemical compound can be - it is not uncommon for macromolecules (large
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THE IMPACT OF WELDING FUMES ON THE HEALTH OF WELDERS IN POINT FORTIN by Anthony Seemungal A research paper presented to the Department of Occupational Safety‚ and Health of the Cipriani College of Labour and Co-operative Studies in partial fulfilment of the Associate of Science Degree In Occupational Safety & Health Churchill-Roosevelt Highway Valsayn‚ TrinidadRepublic of Trinidad and Tobago July 2014 Student Research PaperDeclarationI‚ Anthony Seemungal‚ submit the Research Paper
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2.23 Nitrate-Nitrogen and Nitrite-Nitrogen in Drinking Water Nitrate may be naturally occurring‚ although its presence in drinking water is more often associated with contamination by excessive use of fertilizers (both inorganic and organic)‚ in addition to inappropriate farming practices and sewage. The high nitrate level in drinking water is also associated with the simultaneous presence of bacterial contamination (World Health Organisation‚ 1996). The primary health hazard from drinking water
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produced . No pop sound is heard . The glowing splinter is ignited gently and extinguished within 3 second . 5 Manganese dioxide (untreated) Least effervescence is produced . The test tube is warm Pop sound is heard . The glowing splinter is ignited with violent flame and extinguished within 20 second . When the glowing splinter is pulled out ‚ it rekindled . 6 Boiled manganese dioxide (cooled after heating) Moderate amount of effervescence is produced . Pop sound is heard . The
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piece of zinc and see if that would make it go faster‚ but I did not want to interrupt the process. It seemed the longer that the mossy zinc was exposed to the hydrochloric acid the faster it dissolved and therefore more gas was produced. When the manganese and the hydrogen peroxide were exposed to each other there was much more fizzing produced than that of the zinc and the hydrochloric acid. I was surprised (although I don’t know why) that the lime water turned cloudy when exposed to breath. It is
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battery-operated clocks. It is best used for low drain appliances‚ which need only small currents such as portable items (radio). It consists of a zinc outer casting‚ the anode‚ an aqueous paste of ammonium chloride and a mixture of powdered carbon and manganese dioxide around a carbon rod‚ which is the cathode. Initially no zinc chloride is present‚ but as the cell is used zinc ions are formed and ammonium ions are discharged. The reaction at the anode‚ the zinc cylinder is: Zn(s) → Zn2+(aq) + 2e- At
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