Rubbing alcohol is a product available at most pharmacies and supermarkets. One rubbing alcohol solution contains 2-propanol and water. The boiling point of 2-propanol is 82.3°C at standard pressure.

71 Explain, in terms of electronegativity differences, why a C O bond is more polar than a C H bond. [1]

Answer==>There is a greater electronegativity difference in a C–O bond than in a C–H bond.

72 Identify a strong intermolecular force of attraction between an alcohol molecule and a water molecule in the solution. [1]

 

Answer==>   hydrogen bonding or  dipole–dipole

73 Determine the vapor pressure of water at a temperature equal to the boiling point of the 2-propanol. [1]

 

Answer==>  Table H...a pressure between 48kPa and 52kPa

74 Explain, in terms of charge distribution, why a molecule of the 2-propanol is a polar molecule. [1]

 

Answer==>   asymmetrical distribution of charge

75 In the space in your answer booklet, draw a structural formula for the 2-propanol. [1]

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on to Questions 76-77