that decays to 12.5 g of nitrogen-16 in 21.6 s? 100g50g25g12.5g…3 half lives have passed 21.6s/3 half lives = 7.2 seconds half-life of nitrogen – 16 3. All isotopes of technetium are radioactive‚ but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 639 000 yrs‚ what is its half-life? 800g/2 400g/2 200g/2 100g…3 half lives have passed 639‚000years/3 half lives = 213‚000 years half-life of technetium – 99 4. A 208
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a complete mechanism of each pair of reactant including any favorable rearrangements and all important resonance structures of all intermediates. Reactant Pair 1 Cl H Br 1 + Cl No shift stable benzylic carbocation H: shift H H Br 2 3 Cl + Cl a. Which reaction has a lower PE carbocation intermediate? Reaction pair 1 is more stable (stabilized by resonance) 2o benzylic is more stable than 3o. b. Draw an energy diagram showing the reaction profiles of both reactions in the previous
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References: [1] http://mccord.cm.utexas.edu/courses/spring2005/ch455/Spr05455Wk4Lab.pdf [2] http://ph.answers.yahoo.com/question/index?qid=20100914060152AAxbo3I [3] http://en.wikipedia.org/wiki/EDTA [4]http://www.gannon.edu/resource/dept/sim/new/chemexp_files/Most%20used%20ChemLabs/PDF%20Files/pH%20water%20hardness.pdf
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July 14‚ 2009 Experiment 6: Fractional Distillation. Separation of Petroleum Hydrocarbons Abstract: A mixture of cyclohexane and toluene were separate from one another by fractional distillation in order to measure the composition of each fraction and prepare the sample for gas chromatography. Introduction: Distillation has been used since antiquity to separate the components of mixtures. This method has been used to manufacture different organic chemicals but the most recent application
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Manufacturing cars‚ or producing construction supplies all ties in with the activity series. Without it‚ cars or buildings could very well be rusting and dissolving around us. Metal/ Cation or Solution HCl H2O CuSO4 ZnSO4 MgSO4 SnCl2 Fe(NO3)3 Cu NR NR NR NR NR NR NR Mg R NR R R NR R R Sn R NR R NR NR NR NR Zn R NR R NR NR R R Fe R NR R NR NR R NR Steel (FeAl) R NR R NR NR R NR Table 1 : Predictions Metal/Cation Or Solution HCL Mg2+ H2O Cu2+ Zn2+ Fe2+
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Introduction The ‘Arab’ spring of 2011 is a wave of revolutions taking place in the Arab world. It has its own and unique characteristics. The name is an allusion to the 1848 “Spring time of the Peoples”. The 1848 revolution was also a political upheaval throughout Europe and it spread to almost 50 countries including Latin America; whereas the cause of Arab Spring is also “dissatisfaction with political leadership”. That is why a comparison is drawn between these two revolutions. This term was
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that “Matter can neither be created nor destroyed during a chemical reaction.” This law is dictates the necessity for balancing a chemical equation with coefficients; if we didn’t balance equations‚ we would be created and/or destroying chemicals. 3. mole-mole problem: One disadvantage of burning propane (C3H8) is that carbon dioxide is one of the products. The released CO2 increases the growing concentration of CO2 in the atmosphere. How many moles of carbon dioxide are produced when 10.0 moles
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every two electrons would necessitate going to a new orbital. 1 | 1s1 | 11 | 1s2 2s2 2p2 3s2 3p2 4s1 | 21 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 4p2 5s2 4d2 5p1 | 2 | 1s2 | 12 | 1s2 2s2 2p2 3s2 3p2 4s2 | 22 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 4p2 5s2 4d2 5p2 | 3 | 1s2 2s1 | 13 | 1s2 2s2 2p2 3s2 3p2 4s2 3d1 | 23 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 4p2 5s2 4d2 5p2 6s1 | 4 | 1s2 2s2 | 14 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 | 24 | 1s2 2s2 2p2 3s2 3p2 4s2 3d2 4p2 5s2 4d2 5p2 6s2 | 5 | 1s2 2s2 2p1 | 15 | 1s2 2s2 2p2 3s2 3p2
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Blackie & Son Limited; pgs. 22-34‚ 47-50. http://curlyarrow.blogspot.com/2011/11/lets-talk-about-tlcs-part-5-iodine.html (retrieved on September 2‚ 2012) http://media.rsc.org/Modern%20chemical%20techniques/MCT5%20Chromatography.pdf (retrieved on September 2‚ 2012) http://www.umich.edu/~orgolab/Chroma/chromahis.html (retrieved on September 5‚ 2012)
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The Rite of Spring The Rite of Spring is a ballet/orchestral piece composed by Igor Stravinsky and choreographed by Vaslav Nijinsky. Premiering on May 29th‚ 1913‚ at the Théatre des Champs-Elysées‚ The Rite of Spring was one of the most controversial and scandalous scores in the history of music and dance. Featuring elements of pagan sacrifice‚ outrageous costumes‚ and strange choreography‚ the performance started a riot in the audience and as a result‚ the choreography was never played along with
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