MED109 Chemistry Lecture 7: Colligative Properties
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Questions and Answers

What is the main characteristic of colligative properties of solutions?

  • They only apply to solutions with volatile solutes
  • They are affected by the isotonic coefficient
  • They depend only on the amount and nature of the solvent (correct)
  • They depend on the chemical identity of the solute particles

    • According to Raoult's Law, what is the relationship between the partial vapor pressure of a solvent above a solution and the vapor pressure of the pure solvent?

  • Psolution = P0 / Xsolvent
  • Psolution = Xsolute P0
  • Psolution = P0 - Xsolute
  • Psolution = Xsolvent P0 (correct)

    • What is the effect of adding non-volatile solute particles to a solvent on the vapor pressure?

  • It decreases the vapor pressure (correct)
  • It causes the vapor pressure to remain constant
  • It has no effect on the vapor pressure
  • It increases the vapor pressure

    • What is the boiling point elevation (ΔTb) directly proportional to?

    <p>The molal concentration of the solute</p> Signup and view all the answers

    What is the relationship between the freezing point depression (ΔTf) and the molal concentration of the solute?

    <p>ΔTf is directly proportional to the molal concentration</p> Signup and view all the answers

    What is the main difference between non-electrolyte, strong electrolyte, and weak electrolyte solutions?

    <p>The nature of the solute particles</p> Signup and view all the answers

    What is osmosis?

    <p>The transport of solvent molecules from a higher concentration to a lower concentration</p> Signup and view all the answers

    What is the relationship between osmotic pressure and the ideal gas law?

    <p>There is no relationship between osmotic pressure and the ideal gas law</p> Signup and view all the answers

    What is an example of a colligative property?

    <p>Vapor pressure lowering</p> Signup and view all the answers

    Why do solute particles interfere with the escaping tendency of solvent molecules?

    <p>Because solute particles are non-volatile</p> Signup and view all the answers

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