Edexcel Jun 2017 Paper 4 Q3

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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 3 Nitrogen dioxide, NO2, reacts with carbon monoxide, CO. NO2 + CO (cid:108) NO + CO2 The rate equation is rate = k[NO2]2. (a) The concentration of nitrogen dioxide was doubled and the concentration of carbon monoxide was halved, while the temperature remained constant. The rate constant, k, will A stay the same. B double. triple. D quadruple. (1) (b) Which is a possible mechanism for the reaction that is consistent with the rate equation? (1) A 2NO2 + 2CO (cid:108) N2 + O2 + 2CO2 N2 + O2 (cid:108) 2NO B 2NO2 + 2CO (cid:108) N2 + O2 + 2CO2 N2 + O2 (cid:108) 2NO C 2NO2 (cid:108) 2NO + O2 2CO + O2 (cid:108) 2CO2 D 2NO2 (cid:108) 2NO + O2 2CO + O2 (cid:108) 2CO2 fast slow slow fast fast slow slow fast Use this space for any rough working. Anything you write in this space will gain no credit. (Total for Question 3 = 2 marks) A E R A S I H T N I E T I R W T O N O D *P48082A0328* Turn over<br />

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