Understanding chemical bonds is at the core of chemistry. Having a greater understanding of the bonds within and between atoms and molecules allows us to predict their properties and how they may react. This unit is assessed externally as AS91164 (2.4). For a sample exam paper with exemplar answers see the following page. You will need to be able to describe the difference between metallic, covalent (polar & non-polar), and ionic bonds for this unit. Additionally you will need to be able to describe and calculate enthalpy changes during reactions, and discuss giant network molecules. For a review game try this.