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0 [{"id":463115,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:48:36","updated_at":"2018-05-15 10:24:49","questionName":"For an abstraction reaction OH + RH \u2192 H2O + R with a positive activation energy,\r\nand where R represents an alkyl radical, sketch a plot of ln k vs 1\/T (where k is the\r\nbimolecular rate coefficient) over a wide range of temperature (e.g. 200 \u2013 1000 K).\r\nIdentify regions where your plot differs from Arrhenius behaviour at low and high\r\ntemperatures, providing brief explanations for these differences.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":6,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463128,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:56:10","updated_at":"2018-05-15 10:24:49","questionName":"Briefly outline the assumptions behind the Eyring equation (k = k\u2260\r\nK\u2260\r\n) and show how\r\nit can be derived by considering an equilibrium between reagents and the transition\r\nstate.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":12,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463113,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:47:53","updated_at":"2018-05-15 10:24:49","questionName":"Explain why in a typical abstraction reaction the pre-exponential factor is\r\nless than KbT\/h.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":4,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463121,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:51:06","updated_at":"2018-05-15 10:24:49","questionName":"State the approximation necessary to express q as a product of molecular partition\r\nfunctions considering translation, rotation, vibration and electronic transitions?","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":8,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463131,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:56:55","updated_at":"2018-05-15 10:24:49","questionName":"Calculate the collision rate with a single Cu atom (area 6.52 \u00d7 10-20 m2\r\n) by 35 Pa of\r\nhelium at 80 K. Comment on the implications on the background pressure required to\r\nmaintain a clean sample.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":14,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463114,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:48:18","updated_at":"2018-05-15 10:24:49","questionName":"Give an example of a type of reaction where the pre-exponential factor is\r\nmore than KbT\/h.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":5,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463107,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:46:55","updated_at":"2018-05-15 10:24:49","questionName":"Outline one piece of experimental evidence for the conceptual basis of transition\r\nstate theory. Include, as appropriate, any diagrams to help explain your answer","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":2,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463124,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:55:05","updated_at":"2018-05-15 10:24:49","questionName":"Consider two systems under the same conditions, except that one is composed of\r\ndistinguishable and the other of indistinguishable molecules. Explain in general terms,\r\nwithout the need of deriving any of the results, whether there is a difference in the:\r\n(a) The entropy of the two systems\r\n(b) The internal energy of the two systems\r\n(c) The Helmholtz energy of the two systems. ","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":9,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463104,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:45:52","updated_at":"2018-05-15 10:24:49","questionName":"What is the meaning of q\r\nrot and q\r\nvib ?","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":0,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463106,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:46:28","updated_at":"2018-05-15 10:24:49","questionName":"Using the calculated values for q\r\nrot and q\r\nvib from part (b), sketch the molar heat\r\ncapacity of Cl2 as a function of temperature considering contributions from\r\ntranslation, rotation, and vibration. You should include axis labels and relevant\r\nvalues of the molar heat capacity and temperature.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":1,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463127,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:55:44","updated_at":"2018-05-15 10:24:49","questionName":"Consider a chemical reaction that is endothermic. Explain in general terms, how the\r\nbalance of such a reaction can be tipped towards products?","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":11,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463129,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:56:28","updated_at":"2018-05-15 10:24:49","questionName":"Sketch a plot of the Langmuir isotherm (surface coverage as a function of gas\r\npressure) for the physiadsorption of a gaseous species. Describe qualitatively how and\r\nwhy you would expect the plot to change as the temperature was decreased.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":13,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463126,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:55:27","updated_at":"2018-05-15 10:24:49","questionName":"Consider an isolated system of 3 distinguishable, non-interacting atoms that occupy a\r\nset of 3 energy levels which are equally spaced by one energy unit. Assume that the\r\nground state has zero energy, how many microstates are compatible with the\r\nmacrostate if the total energy of the system is 3 energy units?","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":10,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463117,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:50:39","updated_at":"2018-05-15 10:24:49","questionName":"State the approximation necessary to express QN in terms of the molecular\r\npartition function q. ","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":7,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":463109,"quiz_id":"23778","answer_id":null,"answerType_id":"0","created_at":"2018-05-15 09:47:14","updated_at":"2018-05-15 10:24:49","questionName":"Derive the Eyring equation, k = \uf0b9 \uf0b9 Kk for the reaction A + BC \u2192 AB + C outlining\r\nany assumptions made in the derivation.","questionTimeSeconds":"0","questionTimeMinutes":"10","questionImagePath":null,"position":3,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null}]
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For an abstraction reaction OH + RH → H2O + R with a positive activation energy, and where R represents an alkyl radical, sketch a plot of ln k vs 1/T (where k is the bimolecular rate coefficient) over a wide range of temperature (e.g. 200 – 1000 K). Identify regions where your plot differs from Arrhenius behaviour at low and high temperatures, providing brief explanations for these differences.

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