1. Properties of alcohol Starter: Draw a graph to compare the boiling points of alkanes and alcohols Keywords: Volatility, solubility, hydrogen bonding

2. AlkaneMolecular massBoiling point 30-89 44-42 58-0.5 7236 8669 AlcoholMolecular massBoiling point 3265 4678 6097 74118 88138

3. Learning Objectives A Explain, in terms of hydrogen bonding, the water solubility and the relatively low volatility of alcohols B Describe the difference between primary, secondary and tertiary alcohols C Classify alcohols into primary, secondary and tertiary alcohols

4. Physical properties Physical properties of alcohols are influenced by their ability to form H-bonds between the O-H group and neighbouring molecules Hydrogen bonding between ethanol molecules

5. Relatively high melting and boiling points is due to the presence of H-bonds between alcohol molecules H-bonds in alcohol molecules also results in alcohols having lower volatility than alkanes of a similar mass (observing boiling points)

6. Solubility Alcohols dissolve in water because H bonds form with the O-H functional groups Solubility decreases as the chain length increases

7. Classification of alcohols

8. Plenary Questions pg 151