AS2.4 Bonding, structure (External)

This externally assessed standard is worth 5 credits and is essential for
understanding at Level 3.
You will cover a large amount of content and the teaching component will take
approximately 10 weeks of class time.

The following is a comprehensive list of all the key areas that you must cover for AS2.4.

WHAT YOU NEED TO KNOW!

Lewis diagrams of simple molecules (ie molecules having no more than four electron pairs about any atom, including multiple-bonded species).Ionic, covalent and metallic bonding.
Polarity of the bonds using concepts such as electronegativity to justify your choice.
You need to know how a polar bond is formed and the factors that determine the polarity of a molecule overall (shape of the molecule and the presence of polar bonds).Molecular shape, based on the number of bonding and non-bonding pairs of electrons.
Make sure you can draw the shapes (using wedges and dotted lines to represent the 3-D shape) and explain why molecules are a particular shape.
Recognise bond angles of common shapes and explain why these bond angles occur.
Types of solids are restricted to molecular, ionic, metallic, and covalent network. The nature of solids will be limited to the type of constituent particles (ions, atoms, or molecules) and the attractive force between them (ionic, covalent, metallic bonds or weak intermolecular forces).
Physical properties of different solids in terms of the structure and bonding within the solid.
Classification of reactions as exothermic and endothermic, using energy diagrams, the sign of ∆rH or heat changes.
Energy changes associated with bond making and bond breaking.
Enthalpy change relates to the change of energy in a chemical reaction.
Calculation of enthalpy changes given amounts or mass of substances, a balanced equation, and ∆rH. 
Bond energy calculations.