Regardless of its shape, a given orbital may contain no more than:
A. 1 electron.
B. 4 electrons.
C. 8 electrons.
D. 2 electrons.
D
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Why do scientists repeat their experiments over and over again?
a. They never get it right the first time. b. They can never be sure what procedural steps they followed the first few times. c. They must make sure the results were not an accident and that they are repeatable. d. They simply have extra time and resources that must be used.
"P" is the chemical symbol for
A. nickel. B. potassium. C. plutonium. D. phosphorus. E. copper.
What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?
A) The muscles would be unable to contract. B) The person's muscles would contract uncontrollably. C) The sarcoplasmic reticulum would release sodium ions instead of calcium ions. D) The muscles would swell.
Which scientist proposed the idea that because giraffes stretched their necks to reach for higher leaves, a longer neck would be passed to their offspring?
A. Darwin B. Lamarck C. Lyell D. Wallace