destroyer #43 genchem

[art777]

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which of the following is false?

a, b, c, d, e....

the one thats false is D and it says "all molecules of an ideal gas have the same kinetic energy @ constant temp."

I watched chads videos and he clearly said that kinetic energy is directly proportional to temperature and that no matter what u do to a gas, if the temperature doesn't change the kinetic energy will not change

so i dont get it, is this a mistake or am i missing something? if the temperature is kept constant then (its not changing) then the kinetic energy must be the same according to chad but destroyer says this is false... which is which

 

[AlbinoPolarBear]

which of the following is false?

a, b, c, d, e....

the one thats false is D and it says "all molecules of an ideal gas have the same kinetic energy @ constant temp."

I watched chads videos and he clearly said that kinetic energy is directly proportional to temperature and that no matter what u do to a gas, if the temperature doesn't change the kinetic energy will not change

so i dont get it, is this a mistake or am i missing something? if the temperature is kept constant then (its not changing) then the kinetic energy must be the same according to chad but destroyer says this is false... which is which

At a certain temperature, there is a Boltzman distribution of kinetic energy among the molecules. Not all molecules will have the same kinetic energy.

The higher the temperature, the greater the average kinetic energy of the molecules.

 

[mh0000]

"all molecules of an ideal gas have the same kinetic energy @ constant temp."
This is not correct. All ideal gases at any given temperature have the same AVERAGE kinetic energy. Like albino said, look at any velocity distribution curve for an ideal gas and you will see a spread of velocities with the most frequent speed being the root mean square speed.
'if the temperature doesn't change the kinetic energy will not change
" The kinetic energy of a single gas molecule will change VERY quickly and constantly. again its the average KE that doesn't change. This is a description of the entire gas sample, not any given molecule.

 

[spoog74]

"all molecules of an ideal gas have the same kinetic energy @ constant temp."
This is not correct. All ideal gases at any given temperature have the same AVERAGE kinetic energy. Like albino said, look at any velocity distribution curve for an ideal gas and you will see a spread of velocities with the most frequent speed being the root mean square speed.
'if the temperature doesn't change the kinetic energy will not change
" The kinetic energy of a single gas molecule will change VERY quickly and constantly. again its the average KE that doesn't change. This is a description of the entire gas sample, not any given molecule.

+1 for this one. Sometimes i wonder why Chad or the destroyer NEVER put like a caption or letters in bold stating that the AVERAGE kinetic energy is the same but the KINETIC energy wont always be the same. That would have cleared a lot of things up for me back in the day when i started studying for the exam

 

[art777]

-____- wow i cant believe we have to analyze every single word on a timed exam like the DAT... stupid trick question