Chemistry Past Questions and Answers

Which of the following compounds is used as a gaseous fuel?

Copy and complete the following table<br/><table class='tbn'><tbody><tr><td> Element </td><td> Number of Neutrons </td><td> Electronic Configuration </td><td> Group in the periodic Table </td></tr><tr><td> \(^{23}_{11}Na\) </td><td> --- </td><td> 1s\(^{2}\)2s\(^{2}\)2p\(^{6}\)3s\(^{1}\) </td><td> 1 </td></tr><tr><td> \(^4_2He\) </td><td> 2 </td><td> ---- </td><td> --- </td></tr><tr><td> ---- </td><td> 7 </td><td> 1s\(^{2}\)2s\(^{2}\)2p\(^{2}\) </td><td> ---- </td></tr></tbody></table><br/><br/><br/>

(a) State two postulates of the kinetic theory of gases.<br/>(b) Write two chemical properties that are common to both carbon (IV) oxide and sulphur (IV) oxide.

(a)(i) Arrange the following elements in the order of increasing reactivity. Iron, Lead, Magnessium, Aluminium.<br/>(ii) Which of the following elements in (a)(i) above reacts with sodium hydroxide to give hydrogen?<br/> <br/>(b) What property of tetraoxosulphate (VI) acid does each of the following reactions illustrate?<br/>(I) S + 2H\(_2\)SO\(_4\) ---> 3SO\(_4\) + 2H\(_2\)O<br/>(ii) MgO + H\(_2\)SO\(_4\) ---> MgSO\(_4\) + H\(_2\)O<br/>(iii) C\(_{12}\)H\(_{22}\)C\(_{11}\) + H\(_2\)SO\(_4\) ---> 12C + H\(_2\)SO\(_4\) + 11H\(_2\)O

(a) What is the IUPAC name of Fe\(_2\)(SO\(_4\))\(_3\)?<br/>(b)(i) Write an equation to represent the reaction of hydrogen sulphide with iron (III) chloride solution.<br/>(ii) Mention one change observed during the reaction in (b)(i) above.