Diethyl ether can be made from ethanol. The reaction is: 2 C2H5OH(l) ? (C2H5)2O(l) + H2O(l) The percent yield of diethyl ether in one experiment was 94.0% and actual yield was 68.6 g. How much ethanol did the chemist use in this experiment?
A) 45.4 g
B) 73.0 g
C) 80.2 g
D) 90.7 g
D
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Which of the following statements is false?
A) The atomic spectrum of helium is different from the atomic spectrum of neon. B) Electromagnetic radiation often behaves like a wave. C) An atomic spectrum is an element's fingerprint. D) An atom emits electromagnetic radiation when an electron moves from a lower energy level to a higher energy level. E) Light that is high in energy has a high frequency.
When several cities grow and merge together into vast urban areas, they are called
A) primate cities. B) regions. C) agglomerations. D) conurbations.
Keystone species have a large effect on the types and abundances of other species in an ecosystem.
Answer the following statement true (T) or false (F)
Projected climate changes, such as warmer temperatures, in Southwest Asia and North Africa will likely decrease the amount of runoff in the region, further stressing stream and rivers and reducing hydroelectricity potential and diminishing water
available for the region's increasingly urban population. Indicate whether the statement is true or false