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) NaCl has a higher melting point because it is a solid at room temperature.
C) 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.
D) The aluminum oxide has a higher melting point because of the covalent bonds within the molecule.
C
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How would the eruption of a volcano cause global climate changes?
A. Dust from the volcano blocks sunlight. B. Sulfuric acid is produced which interferes with solar radiation. C. It can cause stratospheric ozone reduction allowing increased ultraviolet light to reach the Earth's surface. D. Both "Dust from the volcano blocks sunlight" and "Sulfuric acid is produced which interferes with solar radiation." E. Both "Sulfuric acid is produced which interferes with solar radiation" and "It can cause stratospheric ozone reduction allowing increased ultraviolet light to reach the Earth's surface."
The principle of interposition in visual perception suggests that
A. An object with an incomplete outline appears behind another. B. An object with an incomplete outline appears at the same level as another. C. An object with an incomplete outline appears in front of another.
List three uses for nonpotable water. What will be an ideal response?
The ice-albedo feedback is based on
A) the relationship between albedo and insolation absorbed by the surface. B) the relationship between albedo and the ITCZ. C) the relationship between albedo and sulfate aerosols. D) the relationship between albedo and sea level.