How many electrons are there in the third shell of sodium, Na (atomic number 11)?
A. none
B. one
C. two
D. three
Answer: B
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Which gas is a major source of indoor pollution?
A) carbon dioxide B) radon C) nitrous oxide D) sulfuric acid
How many cycloalkenes have the molecular formula C4H6?
A) 1 B) 2 C) 3 D) 4
Earth's rotational axis is inclined ____ off of being perpendicular to the plane of the ecliptic
a. 12.5 degrees b. 23.5 degrees c. 32.5 degrees d. 44.5 degrees e. 66.5 degrees
Beach nourishment is a common technique for minimizing shoreline retreat. Which of the following is a negative consequence of beach nourishment?
A. is costly and must be done periodically B. excessive algae growth in the surf zone C. loss of the beach at high tide D. unwanted deposition on the up-drift side E. unwanted deposition on the down-drift side