What makes a semipermeable membrane selective for one chemical species but not another?
A) The pores in the membrane select by size, they are big enough for water only.
B) The material is hydrophilic and therefore only allows water through.
C) The material is hydrophobic and therefore only allows water through.
D) The material chemically reacts with everything but water.
E) none of the above
Question 2
Which of the following accurately describes osmosis?
A) The more concentrated solution absorbs water from the less concentrated solution.
B) The less concentrated solution absorbs water from the more concentrated solution.
C) The less concentrated solution gets more dilute.
D) The ions migrate from the more concentrated solution to the less concentrated.
E) none of the above
Keystone species.
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