What is diffusion? a. The rate at which solute molecules present ...

[saliriagwu]

What is diffusion?
  a. The rate at which solute molecules present in a solution is equal to the rate they are being
  dissolved
  b. The reforming of crystals
  c. The amount of substances tied to biological cycles
  d. The random movement of materials through a solution

Question 2

What is the average pH of the ocean?
  a. 7.0
  b. 7.5
  c. 8.0
  d. 8.5

[b614102004]

Answer to Question 1

ANS: D
Dissolved substances move randomly through a solution due to diffusion. These substances do,
however, move from areas of high concentrations to areas of low concentrations. Eventually, the result
of diffusion is an evenly distributed, homogenous solution. Information can be found in the section
Water Is a Powerful Solvent.

Answer to Question 2

ANS: C
Although the pH can vary in particular regions and depths of the ocean, the average pH is 8.0. The
amount of carbon dioxide can have large impacts on the pH levels. The range of pH found in the ocean
is approximately 7.0 to 8.5. Information can be found in the section The Ocean's Acid-Base Balance
Varies with Dissolved Components and Depth.

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