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Homework Help: Osmosis, Solutes, and Solvents

  1. Jan 20, 2006 #1
    Are these correct?

    1) The rubbing alcohol sold in drug stores often is composed of 70% isopropyl alcohol and 30% water. In this solution

    a.both water and isopropyl alcohol are solvents.

    b.isopropyl alcohol is the solvent.

    c.water is the solvent.

    d.neither water nor isopropyl alcohol is a solvent.

    2) Which of the following does not affect the solubility of a solute in a given solvent?

    a.polarity of the solute

    b.temperature of the solvent and solute

    c.rate of stirring

    d.polarity of the solvent

    3) Red blood cells are placed into pure water. Which of the following statements is true?

    a.Water molecules flow out of the red blood cells, causing them to collapse.

    b.Water flows into the red blood cells, causing them to swell and burst.

    c.The osmotic pressure inside the cells equals the osmotic pressure outside.

    d.The osmotic pressure of the cell contents increases, causing the cells to burst.

    For this question, I was thinking of a hypotonic solution, but I am unclear of choice d with the osmotic pressure. Is b correct?

    Thank you.
  2. jcsd
  3. Jan 22, 2006 #2
    Looks right. I think its the physical pressure inside the cell that causes it to burst. Also, its osmotic pressure would decrease as it became more full of water.
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