Air pressure is:
A) measured in pascals by American meteorologists.
B) independent of the density of air.
C) independent of the temperature of air.
D) the sum of the partial pressures of its constituent gases.
Answer: D
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Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide, Al2O3?
A. The aluminum oxide has a higher melting point because it is a larger molecule and has a greater number of molecular interactions. B. The aluminum oxide has a higher melting point because of the greater charges of the ions, and hence, the greater force of attractions between them. C. NaCl has a higher melting point because it is a solid at room temperature. D. The aluminum oxide has a higher melting point because of the covalent bonds within the molecule.
Globally, the world's ratio of reserves to annual production for oil, gas, and coal are currently:
A) 51, 57, and 125 years respectively B) 11, 17, and 75 years respectively C) 125, 154, and 51 years respectively D) 51, 125, and 57 years respectively E) 125, 51, and 57 years respectively
The most effective antimalarial strategies involve the use of
A) DDT, bed nets, and quick access to drug treatment. B) DDT, immunization, and the drainage of all standing water in a region. C) immunizations, surgery, and a change in diet. D) sterilization of mosquitoes, treatment of mosquito breeding sites, and antibiotics.
There are many actions an individual can take to help protect endangered and threatened species. Which of the following is least likely to be effective?
A. Do not purchase products made from endangered or threatened species. B. Do not purchase animals taken from the wild. C. Do not purchase plants taken from the wild. D. Spread the word about the importance of this issue. E. When camping, use only local firewood.