When wine turns sour it is the result of the conversion of ethanol, C2H5OH, to acetic acid, HC2H3O2. Which of the following happens to ethanol in this reaction?
A) It is reduced.
B) It is oxidized.
C) It is both oxidized and reduced.
D) It is neither oxidized nor reduced.
B
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Why is a stream able to pick up a grain of sand, but not a smaller grain of silt?
A) Gravity forces the silt to remain on the ground. B) Certain patterns of water flow work better for larger particles. C) Adhesion keeps the silt particles attached to the rock below. D) Cohesion keeps the silt particles attached to each other.
Where do most asteroids originate?
A. from the Kuiper belt B. between Mars and Jupiter C. between the moon and Mars
What bond angle is most closely associated with a tetrahedral distribution of electron density?
A) 90° B) 109.5° C) 120° D) 180°
The A horizon of a soil consists of ____
a. bedrock b. unchanged parent material c. the partly decomposed organic debris d. the topsoil