The charges with sodium chloride are all balanced-for every positive sodium ion there is a corresponding negative chloride ion. Since its charges are balanced, how can sodium chloride be attracted to water, and vice versa?
A) Dispersion forces come into play as the sodium chloride and water come into close proximity.
B) Hydrogen bonding in water allows the sodium chloride molecule to be attracted to the water molecule.
C) As a water molecule gets close to the sodium chloride it can distinguish the various ions and it is thus attracted to an individual ion by ion-dipole forces.
D) This is not a matter of attraction. Sodium chloride dissolves in water because water provides a medium in which the individual sodium and chloride ions can disperse.
C
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Migration to the suburbs in the United States is driven by
A) changes in employment. B) the opportunity to work in factories or service industries. C) the opportunity to live in a detached house with a yard. D) declining opportunities in agriculture. E) a lack of any kind of housing in urban areas.
The U.S. Bureau of the Census has created a method of measuring the functional area of a city, known as
A) the city-state. B) the megalopolis. C) the metropolitan statistical area. D) the metropolitan influence zone. E) the functional city limit.
Which of the following may not be a good choice when eating sustainably?
A) choosing natural foods B) choosing local foods C) choosing vegetarian foods D) choosing organic foods E) choosing seasonal foods
Metamorphism that occurs when rocks are exposed to the pressure and extreme temperature associated with intruding magma is known as
A) contact metamorphism. B) regional metamorphism. C) intrusive metamorphism. D) extrusive metamorphism.