What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur ? 

Give a test that can be used to differentiate between saturated and unsaturated hydrocarbons.

Explain the formation of scum when hard water is treated with soap.

How many structural isomers can you draw for pentane ?

Why is the conversion of ethanol to ethanoic acid an oxidation reaction ?

How would you name the following compounds ?

$(i)$ $CH _{3}- CH _{2}- Br$

$(ii)$ $\begin{matrix}
   H  \\
   |  \\
   H-C=O  \\
\end{matrix}$

$(iii)$ $\begin{matrix}
   \begin{matrix}
   H\,\,\,\,\,H\,\,\,\,\,\,\,H\,\,\,\,\,H\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \,\, \\
   |\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}  \\
   H-C-C-C-C-C\equiv C-H  \\
   \,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   H\,\,\,\,\,\,\,H\,\,\,\,\,\,\,H\,\,\,\,\,H\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}$