Chemistry B (Salters) H033 Salters: Elements from the sea Topical Past Paper Questions

‘Lo Salt’ is a reduced-sodium alternative to regular table salt. Some of the sodium chloride is replaced by potassium chloride. (a) Two models of the structure of sodium chloride are shown below in Fig. 1.1 and Fig. 1.2. Fig. 1.1 Fig. 1.2 ○ Na^{+} ○ Cl^{-} The two models show dif…

Bromine can be extracted from sea water. (a) Describe the appearance and physical state of bromine at room temperature. [1] (b) Sea water contains some bromide ions and these can be displaced as aqueous bromine by reaction with the more reactive halogen chlorine, as shown in Equa…

Methanol can be used as a fuel. It can be made industrially by the catalysed reaction between carbon monoxide and hydrogen as shown in Equation 4.1. $$ \mathrm{CO(g)+2H_{2}(g) \rightleftharpoons CH_{3}OH(g)} \quad \Delta H=-91\mathrm{kJ} \mathrm{mol^{-1}} $$ Equation 4.1 (a) The…