Simple molecules and covalent bonds

1 State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations

2 Describe the formation of covalent bonds in simple molecules, including H₂, Cl₂, H₂O, CH₄, NH₃ and HCl. Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules

4 Describe the formation of covalent bonds in simple molecules, including CH₃OH, C₂H₄, O₂, CO₂ and N₂. Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules

3 Describe in terms of structure and bonding the properties of simple molecular compounds: (a) low melting points and boiling points (b) poor electrical conductivity

5 Explain in terms of structure and bonding the properties of molecular compounds: (a) low melting points and boiling points in terms of weak intermolecular forces (specific types of intermolecular forces are not required) (b) poor electrical conductivity