A solution is prepared by dissolving 215 grams of methanol, CH3OH, in 1000. grams of water. What is the freezing point of this solution? [The freezing point depression constant for water is 1.86°C/mole solute in 1000g of water]
A) -6.72°C
B) -12.5°C
C) -25.0°C
D) -40.3°C
B
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In addition to environmental mismanagement, Lake Baikal's fragile and unique ecology is seriously threatened by
A) tourism. B) climate change. C) gold mines. D) oil refineries.
What does it mean when an area is designated as wilderness?
A. The kinds of uses people make of the land is limited. B. Motor vehicles are only allowed for part of the year. C. People cannot use the land. D. None of these are correct.
A long lightning flash at some distance from the observer produces the thunder we hear as a rumble
Indicate whether the statement is true or false
At the periphery of a hurricane, the air ____, and several kilometers above the surface, in the eye, the air ____
a. sinks; sinks b. is stationary; rises c. rises; is stationary d. rises; rises e. sinks; rises