global markets‚ the investment must be profitable and in some cases sustainable to last year’s into the future. Percentage composition is used widely in the mining industries to calculate and measure the yield of particular metal from an ore. For example‚ haematite (Fe2O3)‚ a compound consisting only of iron and oxygen‚ can theoretically produce around 70% iron while chalcopyrite (CuFeS2)‚ consisting only of copper‚ iron and sulphur can produce theoretically 35% copper. However if we express yield
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A free- rider is a person who wants others to pay for a public good and then plan to use the good themselves; if many people act as free riders‚ the public good may never be provided. The problem with free-rider is when something is offered with no charge‚ people will demand more of it and later that create a shortage on those resources. An Example of free-riders would be health care‚ which requires that hospitals provide emergency care to anyone who needs it‚ regardless of citizenship‚ legal status
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The Chemistry of Toothpaste Toothpaste is not a new thing. It has been traced back to Ancient Egypt. They used a powdered rock and vinegar‚ which created a chemical reaction that dissolves the plaque on teeth. In 1900’s people used hydrogen peroxide and baking soda or chalk‚ pulverised brisk and salt as a toothpaste. Toothpastes today‚ are mostly made up of abrasives‚ surfactants‚ a detergent‚ a thickener‚ a moisturizer‚ water‚ flavouring agents‚ coloring‚ sweeteners‚ fluoride and desensitizers
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6BUS1003 Advanced Corporate Reporting Coursework 2012 semester A The coursework consists of 3 elements: * Notes 10% (to be submitted throughout semester A) * Essay plan 10% * Essay 80% 100% Your final mark for this module will be a weighted average‚ calculated by taking 40% of your coursework mark and 60% of your exam mark. Both the coursework and the exam must be passed for this module. Coursework essay Hans Hoogervorst‚ chairman of the IASB‚ said
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generated by fireworks‚brightening the night sky and immersing it with vivid displays ofcolour and technicality‚ which makes them a crowd pleaser. Behind all the excitement of fireworks‚ chemistry plays an importantrole in creating the vivid colours we witness lighting up the sky. Theactual chemical reactions that take place in the explosions requirethe use of oxidisers‚ reducing agents and binders. The additions ofvarying metal chlorides add the colours. (See Table 1)OxidisersAn oxidizing agent
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Polymerization reaCTIONS polymers are high-molecular-weight compounds‚ fashioned by the aggregation of many smaller molecules called monomers. Ex. plastics that have so changed society and the natural and synthetic fibers used in clothing are polymers. Classification of polymers Homopolymers - consist of repeated long chains or structures of the same monomer unit. Ex. PVC(polyvinyl chloride) Copolymers - polymers that consist of more than one molecule. Trimers - molecules consisting
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Elemental Analysis 1Professor‚ School of Chemical Engineering‚ Chemistry and Biotechnology‚ Mapua Institute of Technology; 2Student‚ CHM146L-B31‚ School of Chemical Engineering‚ Chemistry and Biotechnology‚ Mapua Institute of Technology [pic] ABSTRACT Elemental analysis of organic compounds determine the elements present in them but they do not give the actual structure or the functional groups present. Since all organic compounds contain hydrogen and carbon‚ most tests consist of only the
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Regents Chemistry Quarter 1 Midterm Review 1. The percent by mass of oxygen in Na2SO4 (formula mass = 142) is closest to 1) 11% 3) 45% 2) 22% 4) 64% 2. Given the unbalanced equation: __Al(s) + __O2(g) → __Al2O3(s) 3. 4. 5. 6. 7. balance the equation using smallest whole number coefficients. The percent by mass of aluminum in Al2O3 is approximately 1) 18.9 3) 47.1 2) 35.4 4) 52.9 What is the approximate percent composition by mass of CaBr2 (formula mass = 200)
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For our media coursework we have been watching the film called Jaws‚ which was directed by Steven Spielberg. This film is set in 1970’s in Amity USA and is about a shark which attacks a lot of people. It is set on the 4th of July because that’s when Brody‚ the main characters‚ son was involved in one of the shark attacks. In the music sequence whenever the shark is near or attacking it has its own theme tune which is made to build tension because when you hear that music you know it’s the shark
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contains four sections‚ SECTION A to SECTION D. Instructions: Answer all questions in SECTION A - SECTION D. Make sure that the section heading is included and your answers are correctly numbered. The assignment must have a completed cover sheet. It must be placed in the drop-box on or before the deadline. st SECTION A ELECTRONIC STRUCTURE & IONIZATION ENERGY 1. 2. Write the electronic structure in s‚p‚d notation of the following: O‚ Na‚ Na+‚ Al‚ Cl- and Co
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