Which of the following correctly describes the relationship between the R,S system and the +/- system associated with optically active compounds?
A) All R enantiomers are (+).
B) All S enantiomers are (+).
C) No S enantiomers are (+), but some R enantiomers are (-).
D) There is no general relationship between the R,S designations and the +/- designations.
Answer: D) There is no general relationship between the R,S designations and the +/- designations.
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How does excess CO2 in the atmosphere cause more extreme flooding?
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Which of the following nations in Latin America is a global leader in ecotourism?
A) Mexico B) Costa Rica C) Argentina D) Peru E) El Salvador
If a rock is exposed to such high temperatures that it melts, it forms a(n) ____________________ and
becomes a(n) ____________________ rock. Fill in the blank(s) with the appropriate word(s).
Which one of the source categories listed below is responsible for the most pollution?
A) solid waste disposal B) industrial processes C) electric utilities D) transportation