What forms heavy elements such as gold, mercury, and uranium?
A) A protostar
B) Condensation
C) A supernova
D) A solar nebula
C
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What is the main difference between High-Density PolyEthylene (HDPE) and Low-Density PolyEthylene (LDPE)?
A. One is made from high-density ethylene, the other from low-density ethylene. B. HDPE has very long chains packed close together; LDPE has long chains that are branched and do not pack together well. C. HDPE is more useful than LDPE. D. LDPE is more useful than HDPE. E. HDPE has very long chains packed close together; LDPE has short chains that do not pack together well.
Which of the following species is the reducing agent? 2 CuBr ? ? 2Cu + Br2
A. Cu B. CuBr C. Cu+ D. Br- E. Br2
Which of the following is a major factor in human population increase in the last 200 years?
a. Humans have developed the ability to expand into almost all of the planet's climate zones. b. Early and modern agriculture has allowed more people to be fed per unit of land area. c. Improved health and sanitation has lowered the death rate. d. All of these are correct answers e. Only two of these choices are correct answers
Which of the following factors is the most likely cause of the wind shear associated with several major airline crashes?
A. drylines B. microbursts C. jet stream D. mesocyclones