Chemistry · May / June 2021 · Paper 41 · Question 4
0620
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Dinitrogen tetroxide, N2O4, decomposes into nitrogen dioxide, NO2. The reaction is reversible. N2O4(g) 2NO2(g) colourless gas brown gas A gas syringe containing a mixture of dinitrogen tetroxide and nitrogen dioxide gases was sealed and heated. After reaching equilibrium the mixture was a pale brown colour. end sealed plunger mixture of dinitrogen tetroxide and nitrogen dioxide
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4(a)[2]
the rate of forward reaction equals the rate of the reverse reaction (1)
concentrations of reactants and products are constant (1)
4(b)(i)[1]
(increased pressure) nitrogen dioxide particles or molecules (forced) closer together
OR
same number of nitrogen dioxide particles or molecules in a smaller volume
4(b)(ii)[1]
fewer number of gas moles or molecules on left hand side or reactant side (of the equation) ORA
4(c)(i)[1]
shifts to the right
4(c)(ii)[2]
increase / faster (1)
increase / faster (1)
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