3 Maxwell-Boltzman

 

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Oxford Textbook Pages : 152 - 153

CGP Revision Guide Pages : 74 - 75

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Show Specification Ref : 3.2.2f, 3.2.2g

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Question 1 / 5

AQA Jan 2011 Paper 2 Q2 do not write outside the box the diagram below shows a maxwell boltzmann distribution for a sample of gas at a fixed temperature ea is the activation energy for the decomposition of this gas number of molecules with a given energy ea energy a i on this diagram sketch the distribution for the same sample of gas at a higher temperature marks a ii with reference to the maxwell boltzmann distribution explain why an increase in temperature increases the rate of a chemical reaction marks extra space wmp jan chem do not write outside the box b dinitrogen oxide n o is used as a rocket fuel the data in the table below show how the activation energy for the decomposition of dinitrogen oxide differs with different catalysts n o g n g o g without a catalyst with a gold catalyst with an iron catalyst with a platinum catalyst ea kj mol b i use the data in the table to deduce which is the most effective catalyst for this decomposition mark b ii explain how a catalyst increases the rate of a reaction marks extra space turn over wmp jan chem
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Question 2 / 5

AQA Jan 2012 Paper 2 Q3 do not write outside the box the diagram shows the maxwell boltzmann distribution of molecular energies in a gas at two different temperatures energy a one of the axes is labelled complete the diagram by labelling the other axis mark b state the effect if any of a solid catalyst on the shape of either of these distributions mark c in the box write the letter v w x or y that represents the most probable energy of the molecules at the lower temperature d explain what must happen for a reaction to occur between molecules of two different gases mark marks wmp jan chem do not write outside the box e explain why a small increase in temperature has a large effect on the initial rate of a reaction mark turn over for the next question turn over wmp jan chem
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Question 3 / 5

AQA Jun 2011 Paper 2 Q1 section a answer all questions in the spaces provided do not write outside the box the rate of a chemical reaction is influenced by the size of the activation energy catalysts are used to increase the rates of chemical reactions but are not used up in the reactions a give the meaning of the term activation energy marks b explain how a catalyst increases the rate of a reaction marks c the diagram below shows the maxwell boltzmann distribution of molecular energies at a constant temperature in a gas at the start of a reaction on this diagram the most probable molecular energy at this temperature is shown by the symbol emp the activation energy is shown by the symbol ea number of molecules emp ea energy wmp jun chem do not write outside the box to answer the questions c i to c iv you should use the words increases decreases or stays the same you may use each of these answers once more than once or not at all c i state how if at all the value of the most probable energy emp changes as the total number of molecules is increased at constant temperature mark c ii state how if at all the number of molecules with the most probable energy emp changes as the temperature is decreased without changing the total number of molecules mark c iii state how if at all the number of molecules with energy greater than the activation energy ea changes as the temperature is increased without changing the total number of molecules mark c iv state how if at all the area under the molecular energy distribution curve changes as a catalyst is introduced without changing the temperature or the total number of molecules d mark for each of the following reactions identify a catalyst and name the organic product of the reaction d i the fermentation of an aqueous solution of glucose catalyst name of organic product marks d ii the hydration of but ene catalyst name of organic product marks turn over wmp jun chem
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Question 4 / 5

AQA Jun 2013 Paper 2 Q3 do not write outside the box the diagram shows the maxwell boltzmann distribution for a sample of gas at a fixed temperature ea is the activation energy for the decomposition of this gas number of molecules energy ea emp is the most probable value for the energy of the molecules a on the appropriate axis of this diagram mark the value of emp for this distribution on this diagram sketch a new distribution for the same sample of gas at a lower temperature marks b with reference to the maxwell boltzmann distribution explain why a decrease in temperature decreases the rate of decomposition of this gas marks turn over wmp jun chem
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Question 5 / 5

AQA Jun 2014 Paper 2 Q2 do not write outside the box figure shows the maxwell boltzmann distribution of molecular energies in a sample of gas at temperature t figure energy a one of the axes is labelled label the other axis b state why the curve starts at the origin mark mark c which of the following a b or c describes what the value of y represents in figure write the correct letter a b or c in the box mark a the energy needed for a successful collision b the minimum energy needed for a reaction to occur c the most probable energy wmp jun chem d on figure draw a distribution of molecular energies in this sample of gas at a higher temperature do not write outside the box e the pressure of the original sample of gas is doubled at temperature t state the effect if any of this change on the value of y marks mark turn over for the next question turn over wmp jun chem
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