AQA Jun 2016 Paper 1 Q6 (with explained solutions) |

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AQA Jun 2016 Paper 1 Q6

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do not write outside the box a phosphoric v acid h po is an important chemical it can be made by two methods the first method is a two step process in the first step of the first method phosphorus is burned in air at c to produce gaseous phosphorus v oxide p s o g p o g g of phosphorus were reacted with an excess of air calculate the volume in m of gaseous phosphorus v oxide produced at a pressure of kpa and a temperature of c the gas constant r j k mol give your answer to significant figures marks b in the second step of the first method phosphorus v oxide reacts with water to form phosphoric v acid p o s h o l h po aq calculate the mass of phosphorus v oxide required to produce m of mol dm phosphoric v acid solution marks wmp jun chem do not write outside the box c in the second method to produce phosphoric v acid kg of ca po are added to an excess of aqueous sulfuric acid ca po s h so aq h po aq caso s kg of phosphoric v acid are produced calculate the percentage yield of phosphoric v acid marks d explain whether the first method or the second method of production of phosphoric acid has the higher atom economy you are not required to do a calculation mark end of questions wmp jun chem

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mark scheme a level chemistry chem june question marking guidance mark comments a b correct conversion of temperature and pressure and x no moles p x v nrt p correct rearrangement or insert of values v x x x m v m no moles h po x dm x mols no moles phosphorus v oxide x or x or x g or or or kg or or or tonne mols correct answer with or without working scores marks max m and m if used m or if rounded to sf ie then max m and m if p o used then must be sig figs correct answer with or without working scores marks if m incorrect then can only score m m m if m incorrect can only score m x x min sig fig process mark scheme a level chemistry chem june no moles ca po kg theoretical no moles h po x theoretical mass h po x or actual no moles h po produced c d method a b because only one product no other products formed atom economy even though two steps correct answer with or without working scores marks if m incorrect can only score m and m if m incorrect can only score m and m if m incorrect can only score m and m yield moles or yield mass x x allow calculations do not allow if p o is formed allow converse explanation

Question 1 2 3 4 5 6 7 8 9

Topics to revise

AQA > Physical chemistry > Amount of substance AS >

1 The mole and Avogadro’s constant

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Physical chemistry > Energetics and kinetics AS >

4 Required practical 2 Measurement of an enthalpy change

AQA > Physical chemistry > Equilibrium AS >

2 Industrial processes

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