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 (C)</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 (A)</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 (D)</p> Signup and view all the answers

What is osmosis?

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

What is an example of a colligative property?

<p>Vapor pressure lowering (C)</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 (B)</p> Signup and view all the answers

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