2.5 Polar-Polar Attractions Shape and Polarity LO:I understand how the shape of a molecule can affect it’s polarity.

++ ++ -- +ve side-ve side This molecule has a permanent positive and negative side. This is a molecule.polar Water LO:I understand how the shape of a molecule can affect it’s polarity.

++ -- The polar bonds are opposed. There is no positive and negative side to this molecule. This is a molecule. non-polar Carbon dioxide -- LO:I understand how the shape of a molecule can affect it’s polarity. symmetrically

++ -- This is a molecule.non-polar Tetrachloromethane -- -- -- LO:I understand how the shape of a molecule can affect it’s polarity. The polar bonds are opposed. There is no positive and negative side to this molecule. symmetrically

++ This molecule has a permanent positive and negative side. This is a molecule.polar Trichloromethane -- -- -- -ve side +ve side The C-H bond is non-polar LO:I understand how the shape of a molecule can affect it’s polarity.

2.5.2Intermolecular Attractions and Solubilities LO:I understand the intermolecular forces between polar molecules and their affect on solubility.

Polar-polar attractions are forces of attraction between molecules with a permanent dipole moment. In molecules: polar-polar attractions > van der Waals forces. In molecules: van der Waals forces > polar-polar attractions. LO:I understand the intermolecular forces between polar molecules and their affect on solubility. intermolecular small large

Solubility soluble insoluble In general, polar substances only dissolve in. solvents. Likewise for non-polar substances. LO:I understand the intermolecular forces between polar molecules and their affect on solubility. polar

2.5.3Comparing Boiling Points LO:I understand the affect polarity has on the boiling point of a substance.

Comparing molecules of similar size: Polar molecules have. boiling points than non-polar molecules. LO:I understand the affect polarity has on the boiling point of a substance. There are stronger forces between polar molecules than non-polar molecules. higher intermolecular