In the reaction CH2O(g) + O2(g) ? HCOOH(g) + H2O(g) which species is reduced?
A) CH2O(g)
B) O2(g)
C) HCOOH(g)
D) H2O(g)
B
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Light from a candle has a certain brightness 1 m away. At 2 m away its brightness is
A. one-quarter as much. B. half as much. C. practically the same. D. uncertain.
In the healthy environment of a sustainable soil,
A) the levels of humus steadily decline, but the aeration increases. B) sandy or silty soils are steadily converted to clay soils. C) abundant populations of bacteria are steadily replaced by mycorrhizae. D) the humus-forming processes of topsoil is renewed by the addition of detritus and humus.
What is the common name of CH3-NH-C2H5?
A) ethylmethylamine B) methylethylamine C) N-methylethanamine D) propanamine
Comparing the three phases of water, molecules in the solid phase (ice) have the highest vibrational speed, and molecules in the gaseous phase (water vapor) have the slowest vibrational speeds
a. True b. False