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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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oblinger oblinger
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11 years ago
A sample of helium gas, initially at standard temperature and pressure, is compressed to a smaller volume at constant temperature. What happens to the average speed of the gas molecules?

a. It remains constant.
b. It increases.
c. It decreases.

I am not sure if the volume really affects the speed, so I went with A.
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fisher 2.fisher 2.
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11 years ago
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#2
11 years ago
Well speed is determined by temperature, so yes I believe A. is correct.
tom
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#3
11 years ago
If the volume is smaller, there will be more pressure because of more collisions of the atoms on the side of the container.
wrote...
#4
11 years ago
temperature measures the average kinetic energy of the molecules
so
if temp is unchanged then avg KE is unchanged and since
KE = 1/2*m*v^2 and there is no mass change

I gotta go with a)
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