1 Acids, bases, alkalis and neutralisation

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Oxford Textbook Pages : 40 - 42

CGP Revision Guide Pages : 28 - 29

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Show Specification Ref : 2.1.4a, 2.1.4b

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Question 1 / 3

January 2012 QP – Unit 4 AQA Chemistry A-level_question_3 do not write outside the box ammonia and ethylamine are examples of weak br nsted lowry bases a state the meaning of the term br nsted lowry base mark b i write an equation for the reaction of ethylamine ch ch nh with water to form a weakly alkaline solution mark b ii in terms of this reaction state why the solution formed is weakly alkaline mark c state which is the stronger base ammonia or ethylamine explain your answer stronger base explanation marks extra space wmp jan chem do not write outside the box d give the formula of an organic compound that forms an alkaline buffer solution when added to a solution of ethylamine mark e explain qualitatively how the buffer solution in part d maintains an almost constant ph when a small amount of hydrochloric acid is added to it marks extra space turn over for the next question turn over wmp jan chem
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Question 2 / 3

June 2015 QP – Unit 4 AQA Chemistry A-level_question_5 consider the following reaction sequence starting from methylbenzene do not write outside the box ch ch ch reaction reaction no nh a name the type of mechanism for reaction mark b compound j is formed by reduction in reaction b i give a reducing agent for this reaction mark b ii write an equation for this reaction use h to represent the reducing agent mark b iii give a use for j mark wmp jun chem do not write outside the box c outline a mechanism for the reaction of bromomethane with an excess of compound j you should represent j as rnh in the mechanism marks d compound k c h ch nh is a structural isomer of j explain why j is a weaker base than k marks turn over wmp jun chem
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Question 3 / 3

June 2016 QP – Unit 5 AQA Chemistry A-level_question_7 the following scheme shows some reactions of chromium compounds do not write outside the box reaction reaction crcl s cr h o aq p s green solid reaction reaction reaction cr h o aq q g p s r aq green solution a write an equation for reaction mark b for reaction identify the complex p state a reagent and write an equation marks identity of p reagent equation c for reaction identify q state a reagent and write an equation marks identity of q reagent equation wmp jun chem do not write outside the box d for reaction identify the complex r state a reagent and write an equation for the formation of r from p marks identity of r reagent equation e for reaction suggest the reagents and state the colour of cr h o aq marks reagents colour turn over for the next question turn over wmp jun chem
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