Edexcel Jun 2015 (IAL) Paper 1 Q21

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SECTION B Answer ALL the questions. Write your answers in the spaces provided. 21 A propellant for a rocket consists of a fuel, kerosene, and an oxidizer, liquid oxygen. (a) The formulae of some hydrocarbons present in kerosene are shown in the table below. Hydrocarbon Formula CH3(CH2)10CH3 (i) Name the homologous series to which the compounds A, B, C and E belong. (1)12 *P44880A01228*<br /> (ii) Name the compound A. (1)(iii) Explain the term structural isomers, by reference to two molecules selected from the table in part (a). (3)(iv) Give the molecular formula of the compound D. (2) *P44880A01328* 13 Turn over<br /> (b) In the petrochemical industry, other fuels are obtained by the cracking and reforming of kerosene. Using appropriate letters, A to D, identify a molecule listed in the table that could be formed from E by (i) cracking alone (1)(ii) cracking and then reforming (1)(c) Suggest how engine performance is improved by using a fuel containing the molecule that you have identified in (b)(ii). (1)(d) The energy density of a fuel is defined as the energy produced per kilogram of fuel. 14 Calculate the energy density of dodecane, C12H26, in kJ kg1. Give your answer to two significant figures. The enthalpy change of combustion of dodecane is 8086 kJ mol1. [Molar mass: C12H26 = 170 g mol1] (3) energy density =kJ kg1 (Total for Question 21 = 13 marks) *P44880A01428*<br /> BLANK PAGE *P44880A01528* 15 Turn over<br />

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