AQA Jun 2017 Paper 1 Q6 (with explained solutions) |

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AQA Jun 2017 Paper 1 Q6

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11 Copper can be produced from rock that contains CuFeS2 Balance the equations for the two stages in this process. 0 6 0 6 . 1[2 marks] CuFeS2 + O2 + SiO2Cu2S + Cu2O + SO2 + FeSiO3 Cu2S + Cu2OCu + SO2 0 6 . 2 Suggest two reasons why the sulfur dioxide by-product of this process is removed from the exhaust gases. [2 marks] Reason 1 Reason 2 Question 6 continues on the next page *11* Turn overIB/M/Jun17/7404/1<br />
0 6 . 3 A passenger jet contains 4050 kg of copper wiring. A rock sample contains 1.25% CuFeS2 by mass. 12[4 marks] Calculate the mass, in tonnes, of rock needed to produce enough copper wire for a passenger jet. (1 tonne = 1000 kg) Mass of rock tonnes *12* IB/M/Jun17/7404/1<br />
130 6 . 4 Copper can also be produced by the reaction of carbon with copper(II) oxide according to the equation 2CuO + C2Cu + CO2 Calculate the percentage atom economy for the production of copper by this process. Give your answer to the appropriate number of significant figures. [2 marks] Percentage atom economy *13* Turn overIB/M/Jun17/7404/1 10<br />

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MARK SCHEMEAS-LEVEL CHEMISTRY7404/1JUNE 2017 Question Marking Guidance Mark Additional Comments/Guidance 4CuFeS2 + 91/2 O2 + 4SiO2Cu2S + Cu2O + 7SO2 + 4FeSiO3 Cu2S + 2Cu2O6Cu + SO2 ANY TWO - Prevents acid rain (which damages buidlings/ecology) - Toxic OR causes breathing problems - Reduces waste product OR makes use of the waste OR improves atom economy OR Reduces need for sulfur mining OR used to produce sulphuric acid OR any named products 1 1 1 1 Allow multiples 06.1 06.2 17 of 24<br />
MARK SCHEMEAS-LEVEL CHEMISTRY7404/1JUNE 2017 Question 06.3 06.4 Marking Guidance Mark Additional Comments/Guidance 63.5 M1,M2,M3 are process marks M1 Mol Cu = 4050 x 1000 (= 63780) M2 Mass CuFeS2 = (63780) x 183.5 (= 1.17x107g) M3 Mass ore = (1.17x107) x 100/1.25 M4 Mass ore = 936 tonnes (Allow 936 -937) (2x63.5) % atom economy = =74.3% must be 3sf /171 x100 1 1 1 1 1 Alternative method M1 % of Cu in CuFeS2 =(63.5/183.5)x100 = 34.6% M2 % of Cu in the rock=(34.6/100) x 1.25 = 0.4325% M3 mass of rock = 4050 x 100/0.4325 = 936416kg M4 mass of rock in tonnes= 936 tonnes Notes M1 Ar Cu must be used M2 Mr CuFeS2 to have been used M3 Grossing up for the mass of rock M4 Final answer correct in tonnes 18 of 24<br />
MARK SCHEMEAS-LEVEL CHEMISTRY7404/1JUNE 2017 19 of 24<br />

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