Otto Hahn and Fritz Strassmann discovered fission by bombarding uranium with neutrons. Their discovery was made possible by finding one of the fission products, barium (Ba, atomic no. = 56)
What is a reasonable explanation for why they were unable to initially observe the other product, krypton (Kr, atomic no. = 36) A) Krypton is a noble gas and it may have diffused out of the sample.
B) The isotope of krypton generated might have a short half-life and had undergone radioactive decay to some other element.
C) Krypton is a noble gas and therefore chemically unreactive, making it difficult to characterize by chemical means.
D) both A and B
E) all of the above
E
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An environmentally relevant benefit to protecting the world's sharks is to
A. support shark hunting. B. provide pet food ingredients. C. remove dead or dying fish from the ocean. D. support movies that need sharks for props. E. supply Asian countries with vital food resources.
What do the brackets in the following equation represent?[H3O+] × [OH-] = Kw
A. The molecule in brackets is undergoing hydrogen bonding with the other molecule in brackets. B. The molecule inside does not react with the other molecules in brackets. C. The first molecule in brackets is an acid and it reacts with the second molecule in brackets, which is a base. D. The brackets mean the molarity of the compound inside them. E. none of the above
At about what frequency is Earth struck by a meteorite large enough (about 10 km in diameter) to cause mass extinctions?
A. about every 100 million years B. about every 10 million years C. about every 1 million years D. This has yet to occur on Earth.
As a stream's velocity decreases, which of the following sizes of sediments will be deposited last?
A) gravel
B) clay
C) silt
D) boulders
E) sand