1 Physical and chemical properties

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Oxford Textbook Pages : 190 - 193

CGP Revision Guide Pages : 88

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Show Specification Ref : 4.1.2a, 4.1.2b, 4.1.2c, 4.1.2d

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Question 1 / 5

January 2012 QP – Unit 1 AQA Chemistry A-level_question_1 section a answer all questions in the spaces provided do not write outside the box a fluorine forms compounds with many other elements fluorine reacts with bromine to form liquid bromine trifluoride brf state the type of bond between br and f in brf and state how this bond is formed type of bond how bond is formed marks b two molecules of brf react to form ions as shown by the following equation brf brf brf b i draw the shape of brf and predict its bond angle include any lone pairs of electrons that influence the shape shape of brf bond angle marks b ii draw the shape of brf and predict its bond angle include any lone pairs of electrons that influence the shape shape of brf bond angle marks wmp jan chem do not write outside the box c ions are also formed when potassium fluoride dissolves in liquid brf to form brf kbrf explain in terms of bonding why kbrf has a high melting point marks extra space d fluorine reacts with hydrogen to form hydrogen fluoride hf d i state the strongest type of intermolecular force between hydrogen fluoride molecules mark d ii draw a diagram to show how two molecules of hydrogen fluoride are attracted to each other by the type of intermolecular force that you stated in part d i include all partial charges and all lone pairs of electrons in your diagram e the boiling points of fluorine and hydrogen fluoride are oc and oc respectively explain in terms of bonding why the boiling point of fluorine is very low marks marks extra space turn over wmp jan chem
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Question 2 / 5

June 2010 QP – Unit 1 AQA Chemistry A-level_question_6 do not write outside the box pent ene is a member of the alkene homologous series a pent ene can be separated from other alkenes state the physical property of alkenes that allows them to be separated from a mixture by fractional distillation mark b i state the meaning of the term structural isomerism marks b ii name the branched chain isomer of pent ene shown below ch ch cc mark b iii draw the structure of a functional group isomer of pent ene mark wmp jun chem do not write outside the box c the cracking of one molecule of compound x produces pent ene ethene and butane in a mol ratio deduce the molecular formula of x and state a use for the ethene formed molecular formula of x use of ethene marks turn over for the next question turn over wmp jun chem section b answer all questions in the spaces provided do not write outside the box iodine and graphite are both solids when iodine is heated gently a purple vapour is seen graphite will not melt until the temperature reaches k graphite conducts electricity but iodine is a very poor conductor of electricity a state the type of crystal structure for each of iodine and graphite marks b describe the structure of and bonding in graphite and explain why the melting point of graphite is very high marks extra space wmp jun chem
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Question 3 / 5

June 2010 QP – Unit 1 AQA Chemistry A-level_question_7 section b answer all questions in the spaces provided do not write outside the box iodine and graphite are both solids when iodine is heated gently a purple vapour is seen graphite will not melt until the temperature reaches k graphite conducts electricity but iodine is a very poor conductor of electricity a state the type of crystal structure for each of iodine and graphite marks b describe the structure of and bonding in graphite and explain why the melting point of graphite is very high marks extra space wmp jun chem do not write outside the box c explain why iodine vaporises when heated gently marks d state why iodine is a very poor conductor of electricity mark turn over for the next question turn over wmp jun chem a define the term mass number of an atom do not write outside the box the mass number of an isotope of nitrogen is deduce the number of each of the fundamental particles in an atom of n marks extra space wmp jun chem
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Question 4 / 5

June 2012 QP – Unit 1 AQA Chemistry A-level_question_2 compound x is shown below it is a member of a homologous series of hydrocarbons do not write outside the box h h ccch c h a i deduce the general formula of the homologous series that contains x mark a ii name a process used to obtain a sample of x from a mixture containing other members of the same homologous series mark b there are several isomers of x b i give the iupac name of the position isomer of x mark b ii draw the structure of a functional group isomer of x c at high temperatures one molecule of c h can be converted into two molecules of x and one molecule of another compound c i write an equation for this reaction mark mark wmp jun chem do not write outside the box c ii state the name of the process used to obtain a high yield of x from c h give one reason why this process is used in industry name reason marks c iii state why high temperatures are needed for this process mark d compound x can be converted into compound y compound y is shown below hh ccch c h hhh d i suggest the formula of a reagent that could be added to x in order to convert it into y mark d ii give one use of y mark d iii write an equation to show the reaction of y in a limited supply of air to produce a solid and water only mark question continues on the next page turn over wmp jun chem do not write outside the box d iv when a sample of y contaminated with ch sh is burned completely in air a toxic gas is formed identify this toxic gas and suggest a compound that could be used to remove the toxic gas from the products of combustion toxic gas compound used to remove toxic gas marks d v suggest the name of the process that occurs when the toxic gas in part d iv is removed mark e explain why the boiling points of x and y are similar marks wmp jun chem do not write outside the box the following equation shows the reaction of a phosphine molecule ph with an h ion ph h ph a draw the shape of the ph molecule include any lone pairs of electrons that influence the shape mark b state the type of bond that is formed between the ph molecule and the h ion explain how this bond is formed name of bond how bond is formed marks c predict the bond angle in the ph ion mark d although phosphine molecules contain hydrogen atoms there is no hydrogen bonding between phosphine molecules suggest an explanation for this mark turn over wmp jun chem
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Question 5 / 5

June 2012 QP – Unit 1 AQA Chemistry A-level_question_4 do not write outside the box a graphene is a new material made from carbon atoms it is the thinnest and strongest material known graphene has a very high melting point and is an excellent conductor of electricity part of the structure of graphene is illustrated in the diagram a i deduce the type of crystal structure shown by graphene mark a ii suggest why graphene is an excellent conductor of electricity marks a iii explain in terms of its structure and bonding why graphene has a high melting point marks wmp jun chem do not write outside the box b titanium is also a strong material that has a high melting point it has a structure similar to that of magnesium b i state the type of crystal structure shown by titanium mark b ii explain in terms of its structure and bonding why titanium has a high melting point marks c titanium can be hammered into objects with different shapes that have similar strengths c i suggest why titanium can be hammered into different shapes mark c ii suggest why these objects with different shapes have similar strengths mark d magnesium oxide mgo has a melting point of k predict the type of crystal structure in magnesium oxide and suggest why its melting point is high type of crystal structure explanation marks turn over wmp jun chem section b answer all questions in the spaces provided do not write outside the box a boron trichloride bcl can be prepared as shown by the following equation b o s c s cl g bcl g co g a sample of boron oxide b o was reacted completely with carbon and chlorine the two gases produced occupied a total volume of cm at a pressure of kpa and a temperature of k calculate the mass of boron oxide that reacted give your answer to significant figures the gas constant r j k mol marks extra space wmp jun chem
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