Chemistry Past Questions and Answers

(a) State two properties of alkalis<br/>(b)(i) Why is tetraoxosulphate (VI) acid able to produce two types of salt?<br/>(ii) Write an equation for the reactior involved on heating sodium trioxosulphate (IV) with hydrochloric acid.

Consider the reaction represented by the following Q equation: N\(_2\)O\(_{4(g)}\) \(\rightleftharpoons\) 2NO\(_{2(g)}\) \(\Delta\)H = +57.2KJmol\(^{-1}\)<br/>(a) When is the reaction said to be at equilibrium?<br/>(b) Mention two conditions that can favour the forward reaction<br/>(c) Name the principle involved in (b) above.

(a) List two products obtained when crude oil is refined<br/>(b)(i) What is the general formula for alkanols?<br/>(ii) State the type of reaction involved in the conversion of ethanol to ethanoic acid<br/>(iii) Write an equation to show how ethanoic acid reacts with sodium trioxocarbonate (IV).

(a) State Gay Lussac's law of combining volumes<br/>(b) Hydrogen reacts with oxygen according to the following equation;<br/>2H\(_{2(g)}\) + O\(_{2(g)}\) ---> 2H\(_2\)O\(_{(g)}\). If 50cm\(^3\) of hydrogen were sparked with 30cm\(^{3}\) of oxygen, calculate the volume of unused oxygen after cooling to the initial temperature and pressure.

(a) Mention three chemical properties of chlorine<br/>(b) What type of reaction is represented by each of the following equations?<br/>(i) Mg\(_{(s)}\) + 2HCI\(_{(aq)}\) --> Mg\(_2\)Cl\(_{2(aq)}\) + H\(_{2(g)}\)<br/>(ii) Ag\(^+_{aq}\) + Cl\(^-\)\(_{(aq)}\) ----> AgCl\(_{(s)}\)