Chemistry · Oct / Nov 2016 · Paper 22 · Question B8
5070
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B8 Propenenitrile, CH2=CHCN, is made by passing a mixture of propene, ammonia and oxygen over a catalyst at 450 °C. CH3CH=CH2 + NH3 + 1½O2 CH2=CHCN + 3H2O The reaction is exothermic.
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B8(a)[3]
reactants labelled on left and products labelled on the right AND product level below reactant level (1)
enthalpy change labelled and shown by downward arrow (1)
activation energy shown as upward arrow from left hand energy level to energy ‘hump’ above the highest energy levels of both products and reactants (1)
3
B8(b)[1]
C=C double bond/it is unsaturated (1)
1
B8(c)[2]
CN │ CH – CH2 (1)
extension bonds shown (1)
2
B8(d)(i)[2]
One mark each for any two of:
high melting point/high boiling pointhigh densityhardgood conductor of electricity/good conductor of heatmalleableductileshiny/lustrous 2B8(d)(ii)[2]
Mo(s) + 3Cl2 (g) → MoCl6 (s) correct formulae (1)
correct state symbols, dependent on correct formulae (1)
2 Total: 10
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