Chemistry A H032: Reaction rates and equilibrium (qualitative) Topical Past Paper Questions

Aqueous hydrogen peroxide, $ H_{2}O_{2} $(aq), gradually decomposes to produce water and oxygen. $$ \mathrm{2H_{2}O_{2}(aq) \rightarrow 2H_{2}O(l) + O_{2}(g) } \quad \Delta H=-196\mathrm{kJ} \mathrm{mol^{-1}} \quad \mathrm{Equation} \quad 4.1 $$ The rate of decomposition of $ H_{…

The reaction between sulfur dioxide, $ \mathrm{SO}_{2}(g) $ and oxygen, $ \mathrm{O}_{2}(g) $, to form sulfur trioxide, $ \mathrm{SO}_{3}(g) $, is a key step in the industrial manufacture of sulfuric acid. This is a reversible reaction, shown in Equilibrium 24.1: $$ \mathrm{2SO_{…

Methanol, $ CH_{3}OH $, is manufactured by the reaction of carbon monoxide, CO, with hydrogen, $ H_{2} $. $$ \mathrm{CO}(g)+2\mathrm{H}_{2}(g)\rightleftharpoons\mathrm{CH}_{3}\mathrm{OH}(g)\quad\Delta H=-91\mathrm{kJ}\mathrm{mol}^{-1} $$ (a) Write the expression for the equilibri…