Which of the following statements best describes the concept of structural conformation?
A) rearranging the shape of a molecule by rotating around bonds
B) rearranging the shape of a molecule by changing the arrangement of bonds
C) changing the structure by adding or subtracting bonds
D) arranging the atom into the best conformation for the given structure
E) changing the conformation to generate a new molecule with different chemical properties
Answer: A
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A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J)
A) 6.8 × 1014 Hz B) 2.7 × 1014 Hz C) 7.6 × 1014 Hz D) 8.5 × 1014 Hz E) 9.4 × 1014 Hz
The speeds of the planets about the Sun depend on
A) their distances from the Sun. B) the masses of the planets. C) both of these D) none of the above
If the column of mercury in a barometer stands at 73.0 cm, what is the atmospheric pressure? (The density of mercury is 13.6 × 10^3 kg/m3 and g = 9.80 m/s2)
a. 9.73E+4 N/m2 b. 9.73E+6 N/m2 c. 1.17E+5 N/m2 d. 1.83E+3 N/m2 e. 1.01E+5 N/m2