A closed flask contains a 0.25 moles of O2 which exerts a pressure of 0.50 atm. If 0.75 moles of CO2 is added to the container what is the pressure of oxygen?
A) 0.50 atm
B) 1.0 atm
C) 1.5 atm
D) 2.0 atm
A
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In the summer, vast areas of the tundra are covered by lakes, ponds, and wetlands that are critical nesting sites for migratory birds. Which of the following best explains why this happens?
A. Permafrost prevents drainage of water. B. Dense clay layers prevent drainage of water. C. There is no river for the snowmelt to drain toward. D. Continual rain keeps the land saturated.
An entrepreneur wishes to make a profit by purchasing gold by weight at one altitude and selling it at the same price per newton at another altitude. The entrepreneur should
A. buy at a high altitude and sell at a low altitude. B. buy at a low altitude and sell at a high altitude. C. disregard altitude because it makes no difference. D. none of the above
?Spiders kill far fewer crop-eating insects every year than humans do by using insecticides.
Answer the following statement true (T) or false (F)
When caught in a thunderstorm in an open field, the best thing to do is to
a. run for cover under the nearest tree.
b. lie down flat on the ground.
c. crouch down as low as possible while minimizing contact with the ground.
d. remove all metallic objects from your pockets.
e. climb up onto a hill.