Practice Question
1. Aluminium metal is widely used in countries worldwide. Aluminium has low density and strength that makes it ideal for construction of aircraft, lightweight vehicles, and ladders. (a) [Chemical Bonding] Suggest with reference to the bonding why aluminium has higher melting point than sodium. [2] (b) [Chemical Bonding] Aluminium compounds also have many uses in industries. Aluminium chloride, often in the form of derivatives, is a common component in antiperspirants, at low concentrations. Draw the structure that aluminium chloride exists in vapour state. [1] State the angle of Cl-Al-Cl in the above structure. [1] (c) [Chemical Bonding] Aluminium chloride has a low melting point of 192.4 °C. Explain this phenomenon with reference to its bonding. [2] (d) [Chemical Bonding] Draw the Lewis structure of the product when aluminium chloride reacts with nitrogen trifluoride, NF3 in a 1:1 mole ratio.[2] (e) [Arenes] Friedal-Craft alkylation occurs when benzene reacts with chloroe...