What is the correct name for BaH2?
A) monobarium dihydride
B) barium dihydride
C) barium hydrogen
D) barium hydride
D
Environmental & Atmospheric Sciences
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How many valence electrons does gallium (Ga, atomic no. = 31) have?
A. 1 B. 3 C. 70 D. 6 E. 31
Environmental & Atmospheric Sciences
A softball is launched straight upward at 30 m/s. If air resistance can be neglected, the total time going up and down is
A. 6 s. B. more than 6 s. C. 3 s. D. none of the above
Environmental & Atmospheric Sciences
In the United States, coal use has decreased in recent years.
Answer the following statement true (T) or false (F)
Environmental & Atmospheric Sciences
Aquifers are especially susceptible to contamination
A. Around injection wells B. Around wells C. When they are shallow D. Near their recharge zones E. All of these are correct
Environmental & Atmospheric Sciences