1 Industrial fractional distillation

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Oxford Textbook Pages : 193 - 194

CGP Revision Guide Pages : 134

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Show Specification Ref : 3.3.2.1

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Question 1 / 3

January 2010 QP – Unit 1 AQA Chemistry A-level_question_3 pmt areas outside the box will not be scanned for marking the table below shows the boiling points of some hydrogen compounds formed by group elements boiling point k h o h s h se h te a state the strongest type of intermolecular force in water and in hydrogen sulfide h s water hydrogen sulfide marks b draw a diagram to show how two molecules of water are attracted to each other by the type of intermolecular force you stated in part a include partial charges and all lone pairs of electrons in your diagram marks c explain why the boiling point of water is much higher than the boiling point of hydrogen sulfide mark d explain why the boiling points increase from h s to h te marks wmp jan chem pmt areas outside the box will not be scanned for marking e when h ions react with h o molecules h o ions are formed name the type of bond formed when h ions react with h o molecules explain how this type of bond is formed in the h o ion type of bond explanation marks f sodium sulfide na s has a melting point of k predict the type of bonding in sodium sulfide and explain why its melting point is high type of bonding explanation marks extra space turn over for the next question turn over wmp jan chem
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Question 2 / 3

January 2011 QP – Unit 1 AQA Chemistry A-level_question_4 do not write outside the box cetane c h is a major component of diesel fuel a write an equation to show the complete combustion of cetane mark b cetane has a melting point of oc and a boiling point of oc in polar regions vehicles that use diesel fuel may have ignition problems suggest one possible cause of this problem with the diesel fuel mark c the pollutant gases no and no are sometimes present in the exhaust gases of vehicles that use petrol fuel c i write an equation to show how no is formed and give a condition needed for its formation equation condition marks c ii write an equation to show how no is removed from the exhaust gases in a catalytic converter identify a catalyst used in the converter equation catalyst marks c iii deduce an equation to show how no reacts with water and oxygen to form nitric acid hno mark wmp jan chem do not write outside the box d cetane c h can be cracked to produce hexane butene and ethene d i state one condition that is used in this cracking reaction mark d ii write an equation to show how one molecule of cetane can be cracked to form hexane butene and ethene mark d iii state one type of useful solid material that could be formed from alkenes mark turn over for the next question turn over wmp jan chem
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Question 3 / 3

June 2013 QP – Unit 1 AQA Chemistry A-level_question_2 do not write outside the box a the hydrocarbon but ene c h is a member of the homologous series of alkenes but ene has structural isomers a i state the meaning of the term structural isomers marks a ii give the iupac name of the position isomer of but ene mark a iii give the iupac name of the chain isomer of but ene mark a iv draw the displayed formula of a functional group isomer of but ene mark wmp jun chem do not write outside the box b but ene burns in a limited supply of air to produce a solid and water only b i write an equation for this reaction mark b ii state one hazard associated with the solid product in part b i mark c one mole of compound y is cracked to produce two moles of ethene one mole of but ene and one mole of octane c h only c i deduce the molecular formula of y mark c ii other than cracking give one common use of y mark d in cars fitted with catalytic converters unburned octane reacts with nitrogen monoxide to form carbon dioxide water and nitrogen only d i write an equation for this reaction mark d ii identify a catalyst used in a catalytic converter mark turn over wmp jun chem do not write outside the box in a new material called graphane was discovered the diagram shows part of a model of the structure of graphane each carbon atom is bonded to three other carbon atoms and to one hydrogen atom a deduce the type of crystal structure shown by graphane mark b state how two carbon atoms form a carbon carbon bond in graphane mark c suggest why graphane does not conduct electricity mark d deduce the empirical formula of graphane mark wmp jun chem
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