McGraw-Hill Online Learning Center Test<BLURT>

McGraw-Hill Online Learning Center Test



1. Review the animation and answer the following questions.

Diffusion occurs

A. when there is net movement of molecules from areas of low to high concentration.
B. because molecules slow when they reach areas of low concentration.
C. because molecules accelerate when they reach areas of low concentration.
D. when there is net movement of molecules from areas of high to low concentration.



2. When the dye is applied to the beaker of water, the highest concentration of dye is right at the drops of dye. As time passes, but before the dye is evenly mixed, where will the lowest concentration of dye be? A. Right next to the original drop.
B. As far from the drop as possible.
C. At the site of the original drop.
D. It will vary.



3. Even though the dye molecules are still in constant motion when the dye is evenly mixed, there will not be any further visible change. This is because A. the dye molecules have saturated the solution and the solution cannot get any darker.
B. the eye cannot detect the small changes in dye concentration that continue to occur.
C. there is no net movement of dye molecules.
D. the water prevents any further changes in concentration.


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