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

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Presentation transcript:

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

AlkaneMolecular massBoiling point AlcoholMolecular massBoiling point

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

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

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)

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

Classification of alcohols

Plenary Questions pg 151