Edexcel Jun 2017 Paper 4 Q5

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4 The decomposition of a concentrated solution of hydrogen peroxide is slow at room temperature. What does this indicate about the values for the activation energy and the rate constant for this decomposition? Activation energy Rate constant high high low low high low high low D O N O T W R I T E I N T H I S A R E A (Total for Question 4 = 1 mark) 5 Which process produces a decrease in the entropy of the system? A Mg(s) + H2SO4(aq) (cid:108) MgSO4(aq) + H2(g) B H2O(s) (cid:108) H2O(l) C 2H2(g) + O2(g) (cid:108) 2H2O(g) D CaCO3(s) (cid:108) CaO(s) + CO2(g) (Total for Question 5 = 1 mark) 6 Methane hydrate, CH4.6H2O, decomposes to form methane and water. CH4.6H2O(s) (cid:85) CH4(g) + 6H2O(l) H is positive Which conditions of temperature and pressure will give the highest equilibrium yield of methane? Temperature Pressure high high low low high low high low (Total for Question 6 = 1 mark) *P48082A0428* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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