Science A, Combined (9-1) - Gateway Science Suite J250 9-1: C5: Monitoring and controlling chemical reactions Topical Past Paper Questions

Methanol, CH $ _{3} $OH, can be made by reacting carbon monoxide, CO, with hydrogen, H $ _{2} $. $$ \mathrm{CO}(g)+2\mathrm{H}_{2}(g)\rightleftharpoons\mathrm{CH}_{3}\mathrm{OH}(g) $$ The forward reaction is exothermic. Which change in temperature and pressure will move the posit…

When a solution of yellow $ \mathrm{Fe}^{3+} $(aq) ions is mixed with a solution of colourless SCN $ ^{-} $(aq) ions they react to form a solution of red FeSCN $ ^{2+} $(aq) ions. This is an example of a dynamic equilibrium. (a) Complete the equation for this reaction. $$ \begin{…

When a reversible reaction is left in a closed system, an equilibrium is reached. (a) Look at the equation. $$ 2NO_{2}(g)\quad\rightleftharpoons\quad N_{2}O_{4}(g) $$ It shows the equilibrium between $ \mathrm{NO}_{2}(g) $ and $ \mathrm{N}_{2}\mathrm{O}_{4}(g) $. (i) Fig. 17.1 sh…