Edexcel Jun 2017 (IAL) Paper 4 Q6

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6 The dissociation constant for water, Kw, increases with increasing temperature. Which of these statements about the effect of increasing temperature is correct? A Water becomes acidic. B Water becomes alkaline. C The pH of water decreases. In water, [H 3O+(aq)] increases and [OH(aq)] decreases. (Total for Question 6 = 1 mark) 7 Ethanoyl chloride reacts with an equal amount of A ammonia to form an amine. B methylamine to form an amide. C water to form a weakly acidic solution. D methanol to form ethyl methanoate. (Total for Question 7 = 1 mark) 8 When an optically active isomer of 2-chlorobutane reacts with hydroxide ions to form butan-2-ol by an SN1 mechanism, the product is not optically active. C2H5CHClCH3 + OH (cid:111) C2H5CH(OH)CH3 + Cl What is the best explanation for this? A 2-chlorobutane contains a chiral carbon atom. B The reaction is a nucleophilic substitution. C 2-chlorobutane forms a transition state containing a chiral carbon at the reaction site. D 2-chlorobutane forms a carbocation which is planar about the positively charged carbon. (Total for Question 8 = 1 mark) 9 Which reaction has an enthalpy change equal to the enthalpy change of solution of potassium chloride? A 1 mol KCl(s) + 2 mol of H 2O(l) (cid:111) K+(aq) + Cl(aq) B 1 mol KCl(s) + excess H 2O(l) (cid:111) K+(aq) + Cl(aq) C 1 mol KCl(g) + 2 mol of H 2O(l) (cid:111) K+(aq) + Cl(aq) D 1 mol KCl(g) + excess H 2O(l) (cid:111) K+(aq) + Cl(aq) (Total for Question 9 = 1 mark) A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P48385A0528* Turn over<br />

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