DETERMINATION OF ENTHALPY CHANGE OF NEUTRALIZATION IA Criteria Assessed: DCP CE MS Introduction When an alkali neutralizes an acid‚ a salt and water are formed. Aqueous hydrogen ions (H+(aq)) from the acid react with the hydroxide ions (OH- (aq)) from alkali‚ forming water. The identity of salt will depend on the nature of the acid and alkali used. H+(aq) + OH- (aq) → H2O(L) The combination of H+ and OH- ions in this way releases energy. In this practical‚ the enthalpy changes accompanying
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Copper Sun By: Sharon Draper The novel Copper Sun is a searing work of historical fiction and is action-packed‚ multifaceted‚ and character-rich. It describes a young girl’s life that was stolen from her village‚ sold to the highest bidder‚ enslaved‚ beaten‚ and mistreated. It expresses the different emotions that were felt as the girl went through her long and tiresome journey. Throughout‚ the young girl named Amaris journey‚ she encountered several different characters with similar but different
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experiment‚ we were trying to see whether copper‚ after a chain of chemical reactions‚ will revert back to its elemental form. Procedure: First‚ I added nitric acid with copper in a beaker‚ which turned into a copper nitrate‚ a blue-green solution. Afterwards‚ I added sodium hydroxide‚ and my solution colored to a dark blue solution called copper hydroxide. I heated the solution to evaporate the water and I got a brownish-blackish solid called copper oxide. Once the solid appeared‚ I poured
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: The copper cycle IN TRODUCTION The purpose of the experiment is to recognize that change of state‚ change in colour‚ formation of a precipitate‚ or the evolution of heat are associated with a chemical change; to study reactions of copper. Copper is an element that can be found in nature in a variety of different compounds. The most common natural ore is the sulphide‚ known as chalcocite‚ Cu2S. This mineral is an important source of copper metal because it is about 80% copper by weight
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The mean data observed show a number of trends. The average weight and length tend to decrease as the amount of Ammonium Sulfate approaches the full recommended dose. On the other hand‚ the average amount of protein per gram of tissue tends to increase as the amount of Ammonium Sulfate approaches the full recommended dose. Our null hypothesis was that there is no difference between the mean weights or the mean lengths of the seedlings two different treatments. (A+B‚ A+C‚ and B+C) Each of these
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ABSTRACT Typing has been frequent these days‚ especially because of our fast changing technology. It is done by everyone‚ from professionals to students and to anybody who has a computer or similar device. In fact‚ typing has been essential to work and to assignments‚ and typing speed had become a major role-player. Mozart Music has already been proven to improve vision‚ and motor coordination of a person. It is highly controversial and became a topic of debate between some psychologists. The
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Thesis abstracts / 75 Writing a structured abstract for the thesis James Hartley suggests how to improve thesis abstracts (From Psychology Teaching Review‚ 2010‚ 16‚ 1‚ 98-100) Two books on writing abstracts have recently come to my attention. One‚ Creating Effective Conference Abstracts and Posters in Biomedicine: 500 tips for Success (Fraser‚ Fuller and Hutber‚ 2009) is a compendium of clear advice – a must book to have in your hand as you prepare a conference abstract or a poster
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Laboratory report Aluminum Copper Alloy MSCI 300 – Thermodynamics of Materials Alexandre de Freitas Silveira Eau Claire December 18th‚ 2012. Abstract: At this experiment‚ the composition of an alloy of Aluminum Copper was analyzed via X-Ray Fluorescence. From this‚ it was possible to construct a phase diagram a make some predictions about the possible phases presents at considering the 3 samples used in this experiment‚ the samples prepared at this experiment the sample as delivered
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Measuring the enthalpy change of vaporisation of water You should attempt this part of the activity even if you have not seen the demonstration of the practical. 1. Calculate a value for ∆Hvap for water in KJ mol-1 using the data from the demonstration. Also‚ calculate ∆Hvap from the following data gathered by a student; 8100 J were needed to distil 2.95g of water. a) Explain why the boiling tube was surrounded with expanded polystyrene (or other similar insulation)‚ but the condenser was left
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Signal Processing Society; Publisher: Inst. of Elec. and Elec. Eng. Computer Society Author affiliation: 1 Center for Multimedia and Network Technology‚ School of Computer Engineering‚ Nanyang Technological University‚ Singapore 639798‚ Singapore Abstract: A working prototype of a building identification service which can be used on any camera cell phones equipped with GPS capability has been developed. Users can simply snap photos of architectures and send them‚ together with the corresponding
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