Question from GC DAT destroyer

[NguyenDDS]

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Why is this answer choice false? 😕

"All molecules of an ideal gas have the same kinetic energy at constant temperature."

I always thought this was true, since Kinetic Energy is proportional to temperature... and this is an ideal gas.......

Thanks!

 

[wizi]

Why is this answer choice false? 😕

"All molecules of an ideal gas have the same kinetic energy at constant temperature."

I always thought this was true, since Kinetic Energy is proportional to temperature... and this is an ideal gas.......

Thanks!

I believe that all molecules of an ideal gas have the same AVERAGE AVERAGE KE at a specific T. Average KE is different with a molecule's KE.

 

[yankeefan86]

Why is this answer choice false? 😕

"All molecules of an ideal gas have the same kinetic energy at constant temperature."

I always thought this was true, since Kinetic Energy is proportional to temperature... and this is an ideal gas.......

Thanks!

This is false because some gases weigh heavier than others. If a gas weighs heavier than another gas, it moves at a slower speed. If the gas moves at a slower speed, its kinetic energy will be less than the lighter gas.

 

[Muggsy Bogues]

I believe that all molecules of an ideal gas have the same AVERAGE AVERAGE KE at a specific T. Average KE is different with a molecule's KE.

This. Individual molecules can vary in KE.

 

[recyrb]

Why is this answer choice false? 😕

"All molecules of an ideal gas have the same kinetic energy at constant temperature."

I always thought this was true, since Kinetic Energy is proportional to temperature... and this is an ideal gas.......

Thanks!

It's false because the avergae kinetic energy of the sample is constant at a constant temperature, but individual molecules, some moving at 20 some moving at 40, do not have the same kinetic energy.