Chemistry 7405: Physical Chemistry Topical Past Paper Questions

Which statement about the industrial production of ethanol from ethene at $ 300\ ^{\circ}C $ is correct? $$ \mathrm{C_{2}H_{4}(g)~+~H_{2}O(g) \quad \Rightarrow \quad C_{2}H_{5}OH(g)} \quad \Delta H=-46\ \mathrm{kJ} \quad \mathrm{mol^{-1}} $$ [1 mark] A The use of an acid catalyst…

Which process does not involve a heterogeneous catalyst? [1 mark] A catalytic cracking of alkanes B Contact process C decomposition of ozone D Haber process

The reaction between vanadium(IV) ions and manganate(VII) ions in acidic solution can be represented by the equation $$ \mathrm{5V^{4+}_{+}}+\mathrm{MnO_{4}^{-}}+\mathrm{8H^{+}_{→}}\longrightarrow\mathrm{5V^{5+}_{+}}+\mathrm{Mn^{2+}}_{+}+4\mathrm{H_{2}O} $$ What volume, in dm³, o…