Colligative Properties of Solutions
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Questions and Answers

What effect do solutes have on the vapor pressure of a solvent?

  • They increase vapor pressure.
  • They completely eliminate vapor pressure.
  • They inhibit solvents from escaping as gas, decreasing vapor pressure. (correct)
  • They do not affect vapor pressure.

    • What is the primary cause of boiling point elevation when solutes are added to a solvent?

  • Solutes decrease the density of the solvent.
  • Solutes make it more difficult for the solvent to escape as gas, requiring more energy. (correct)
  • The presence of solutes reduces the temperature at which a solvent boils.
  • The solutes increase the heat capacity of the solvent.

    • In the formula for boiling point elevation, $ ext{Δ}T_b = iK_b m$, what does the variable 'i' represent?

  • The number of dissolved molecules in the solution.
  • The initial temperature of the solvent.
  • The molal concentration of the solute.
  • The number of dissociated particles from the solute. (correct)

    • Which of the following compounds would have an 'i' value of 2 when dissolved in solution?

    <p>Both A and C</p> Signup and view all the answers

    What does the constant $K_b$ represent in the formula for boiling point elevation?

    <p>The boiling point elevation constant unique to each solvent.</p> Signup and view all the answers

    What do colligative properties of solutions depend on?

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

    Which colligative property results in a decrease in the vapor pressure of a solution?

    <p>Lower Vapor Pressure</p> Signup and view all the answers

    What effect does the presence of solute particles have on the boiling point of a solution?

    <p>It raises the boiling point</p> Signup and view all the answers

    What happens to the freezing point of a solution when solute particles are added?

    <p>It decreases</p> Signup and view all the answers

    In which type of solution is the effect of solutes on colligative properties most significant?

    <p>Highly concentrated solutions</p> Signup and view all the answers

    What effect does the addition of a solute have on the vapor pressure of a solvent?

    <p>It lowers the vapor pressure.</p> Signup and view all the answers

    What formula represents the relationship between molality and boiling point elevation?

    <p>$ riangle T_{BP} = i imes K_{bp} imes m$</p> Signup and view all the answers

    What happens to the freezing point of a solvent when a solute is added?

    <p>It decreases.</p> Signup and view all the answers

    In the context of ionic compounds, what does the van't Hoff factor ($i$) represent?

    <p>The number of ions produced when the compound dissolves.</p> Signup and view all the answers

    Which colligative property is affected by the number of solute particles present in a solution?

    <p>Osmotic pressure of the solution.</p> Signup and view all the answers

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