Corrosion is the gradual destruction of materials (usually metals) by chemical reaction with its environment. In the most common use of the word‚ this means electrochemical oxidation of metals in reaction with an oxidant such as oxygen. Rusting‚ the formation of iron oxides‚ is a well-known example of electrochemical corrosion. This type of damage typically produces oxide(s) or salt(s) of the original metal. Corrosion can also occur in materials other than metals‚ such as ceramics or polymers‚ although
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Chapter 4. Buriganga River Pollution by Tannery Industry 4.1 Introduction Tannery industry fulfills a growing international appetite for leather and earns a large amount of foreign revenue. But the tanneries which are located at Hazaribagh are the major cause of Buriganga river pollution. Tanneries of that area do not contain any treatment plant for treating their chemical effluents coming from tanneries processing. These tanneries discharge their liquid chemical and solid wastes into the river
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Review for test #3 1. Calcium is not well absorbedless that 30% 2. A major mineral means you need more of it. 3. The six major minerals are calcium‚ phosphorus‚ magnesium‚ sodium‚ potassium‚ and chlorine. The rest are trace minerals‚ which are not less important‚ but you just need them in less amounts. 4. Minerals are 0 calories. 5. The best source of iron is beef‚ liver‚ or meat. 6. The best source of zinc is beef‚ liver‚ or meat. 7. Vitamin C will help you absorb
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OxidatiOn and ReductiOn OxidatiOn & ReductiOn 9.2 9 Introduction to oxidation and reduction Redox equations Some common oxidising agents and reducing agents (EXT) 9.3 Reactivity 9.4 Voltaic cells 19.1 Standard electrode potentials (AHL) 9.5 Electrolytic cells 19.2 cORe 9.1 Electrolysis (AHL) TOK Are oxidation numbers real? I remember contemplating on the nature of reality back in Chapters 2 and 4‚ with regard to electrons and hybridization respectively
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The pollutants of concern include lead‚ chromium‚ mercury‚ uranium‚ selenium‚ zinc‚ arsenic‚ cadmium‚ gold‚ silver‚ copper and nickel. These toxic materials may be derived from mining operations‚ refining ores‚ sludge disposal‚ fly ash from incinerators‚ the processing of radioactive materials‚ metal plating‚ or the manufacture of electrical equipment‚ paints‚ alloys‚ batteries‚ pesticides or preservatives. Heavy metals such as zinc‚ lead and chromium have a number of applications in basic
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What are the advantages and disadvantages of drinking coffee? Advantages: • Coffee is actually one of the healthiest beverages billions of people consume regularly. • Coffee containing with bitter orange‚ hydroxycitric acid‚ and chromium can encourage an increase up to 30% in metabolic rate. • Coffee with exercise when taking 300mg averages a 20% increase in energy and fatigue while burning fat increased 107% greater than without caffeine. • Caffeine in coffee keeps our brains alert and receptive
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Hypothesis: Residents close to solid waste disposal sites suffer from a higher level of gastro-intestinal disorders. Rationale: Modern societies generate large quantities of waste that have to be either dispersed‚ as with sewage discharged into rivers‚ or sequestered as with solid waste landfill sites. Inevitably some people have to stay in the vicinity of sites where concentrations of wastes build up‚ such as near solid waste disposal sites on the outskirts of cities these people
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Comparing the Density of Metals Question: What is the effect of changing the type of metal on its density? Hypothesis: If a different metal type is used‚ then the density will change. Materials: 4 metal samples Balance 50 ml graduated cylinder Water Paper towels Apparatus: Pre-Lab Questions: 1. What’s the formula to calculate density? D = M / V
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chemical kiln and lime kiln according to different materials. Cement kiln is used for making of cement clinker and there are dry and wet methods to make cement. Metallurgy chemical kiln is used in metallurgy industry and ironworks for lean iron ore‚ chromium ore and ferronickel ore calcination‚ which is used for calcining of high aluminum vandal ochre in refractory material industry; for calcining of calotte and aluminum hydroxide in aluminum manufacturer; for calcining of chrome sand ore and chrome
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Aventurine and Jade Easiest Way to Differentiate Aventurine and jade are two green shaded gemstones that may befuddle a few people. Aventurine is an assortment of quartz which contains little Mica‚ Hematite or Goethite. Jade is the gemstone name given for two distinct minerals Nephrite and Jadeite. This is the key contrast amongst Aventurine and Jade. Now and again‚ aventurine is otherwise called Indian jade or Australian jade‚ yet it is not considered as a type of jade. Aventurine VS Jade What
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