Chemistry · Oct / Nov 2022 · Paper 42 · Question 3
0620
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The question as text
Sulfuric acid is manufactured by an industrial process. Sulfur is obtained from sulfur-containing metal ores. The sulfur in the metal ore is converted to sulfur dioxide which is then oxidised to sulfur trioxide as shown. 2SO2(g) + O2(g) 2SO3(g)
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3(a)[1]
zinc blende
3(b)[1]
strong heating in air / roasting in air
3(c)[1]
contact
3(d)(i)[2]
M1 450 (°C) (1)
M2 1–2 (atm) (1)
3(d)(ii)[1]
vanadium(V) oxide
3(d)(iii)[2]
M1 the rate of forward reaction equals (the rate of the) reverse reaction (1)
M2 concentrations of reactants and products are constant (1)
3(d)(iv)[4]
increased temperature:
M1 (position of) equilibrium moves to left-hand side (1)
M2 reaction is exothermic (1)
increased pressure:
M3 (position of) equilibrium moves to right-hand side (1)
M4 more (gaseous) moles / molecules on left-hand side (1)
3(d)(v)[3]
M1 rate increases and particles have more energy (1)
M2 more collisions (between particles) occur per second / per unit time (1)
M3 more of the particles / collisions have energy equal to or above the activation energy (1)
or
more of the particles / collisions have sufficient energy to react
or
a higher percentage / proportion / fraction of collisions (of particles) are successful / have energy equal to or above activation energy
3(e)[1]
ammonium sulfate
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