Edexcel Jun 2017 Paper 4 Q1

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SECTION A Answer ALL the questions in this section. You should aim to spend no more than 20 minutes on this section. For each question, select one answer from A to D and put a cross in the box If you change your mind, put a line through the box . and then mark your new answer with a cross 1 Bromate(V) ions react with bromide ions in the presence of a dilute acid. BrO3 (aq) + 5Br(aq) + 6H+(aq) (cid:108) 3Br2(aq) + 3H2O(l) The rate of this reaction can be determined by measuring the change in colour intensity or the change in conductivity of the solution. Which changes will occur? Change in colour intensity Change in conductivity decreases decreases increases increases decreases increases decreases increases 2 Substance A decomposes in a first order reaction. (Total for Question 1 = 1 mark) The half-life for this reaction is 48 s. In an experiment, the initial amount of A is 1.00 mol. The amount, in moles, of A remaining at 144 s is A 0.500 B 0.333 C 0.250 D 0.125 (Total for Question 2 = 1 mark) *P48082A0228* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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