Which of the following is true of glucitol?
A) It exists only as an open-chain structure.
B) It exists only as a ring structure.
C) It exists as both ring and open-chain structures with the open-chain structure predominating.
D) It exists as both ring and open-chain structures with the ring structure predominating.
A
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What is the minimum number of double bonds which must be present in a polyunsaturated fat or oil?
A) 2 B) 3 C) 4 D) 5
When a mineral fractures along a cleavage plane, what does this suggest about the crystal structure of the mineral?
A) The crystal structure contains planes along which chemical bonding is much weaker than other directions. B) The crystal contains warped planes called twin planes that weaken the crystal structure and allow it fracture along a planar surface, causing cleavage. C) The atoms are arranged in a simple orderly arrangement with uniform bonding. D) The crystal grows only planar faces that become weak zones that form cleavage.
During which of the following stages is an ordinary thunderstorm most intense?
A. dissipating stage B. multicell stage C. mature stage D. cumulus stage
Which of the following is NOT true about periodic markets around the globe?
A) In Africa, markets occur every 3 to 7 days based on ethnic differences. B) Korean periodic markets are timed with the lunar cycle. C) China's periodic markets are timed to fit 3 10-day cycles in a lunar month. D) Muslim markets operate every day of the week. E) Chinese markets operate within a 3-city arrangement of which one is the central market.