Ethyl chloride is prepared by the reaction of ethane with chlorine according to the reaction: 2 C2H6 (g) + Cl2(g) ? C2H5Cl(l) + HCl(g) The percent yield of ethyl chloride in one experiment was 96.3% and the actual yield was 74.4 g. How much ethylene did the chemist use in this experiment?
A) 35.5 g
B) 38.7
C) 70.9 g
D) 77.3 g
C
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Sprawl is the
A) change in density within an urban area from the periphery to the center. B) development of new housing sites not contiguous to the existing built-up area. C) land maintained as open space surrounding an urban area. D) period in the morning and evening with the heaviest volumes of traffic. E) increasing population density in rings two and three of the concentric zone model.
A large flood in a river may cause abrupt shifts leading to the carving of a new channel. The point at which this change occurs is a(n)
A) type of dynamic equilibrium condition. B) type of metastable equilibrium. C) threshold. D) input.
Which of the following factors is most influential in causing convection in the outer core?
A) The outer core has a low viscosity, approximately equal to that of water at room temperature. B) The outer core has a high heat conductivity. C) Compositional differences create a difference in density. D) Heating causes expansion of fluids.
Sediment is: a. organic or inorganic matter
b. uniform in composition. c. hard and rocklike. d. uniform in size.