conceptual Gchem Q

[tRNA]

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ok, it says that Ne and He have the same kinetic energy (according to the kinetic molecular theory) but they do NOT have the same speed since Ne is heavier and therefore denser than He

but isn't kinetic energy directly proportional to speed?? forexample: catalysts act on the kinetics of the reaction by "speeding" up the rate, so an increase in kinetic energy causes increase in speed or motion of a molecule,

I don't understand why in that situation with the Ne and He they make the distinction between "kinetic energy" and "speed", if they have the same kinetic energy then they should have the same speed.

you might say they don't have the same speed because one is heavier than the other, well then if that's the case then they shouldn't have the same kinetic energy either yet they do,

so i guess iam asking...fill in the blank: if speed is weight dependent, then kinetic energy is ______dependent?

please help clarify this, thanks

 

[TimeforDAT]

ok, it says that Ne and He have the same kinetic energy (according to the kinetic molecular theory) but they do NOT have the same speed since Ne is heavier and therefore denser than He

but isn't kinetic energy directly proportional to speed?? forexample: catalysts act on the kinetics of the reaction by "speeding" up the rate, so an increase in kinetic energy causes increase in speed or motion of a molecule,

I don't understand why in that situation with the Ne and He they make the distinction between "kinetic energy" and "speed", if they have the same kinetic energy then they should have the same speed.

you might say they don't have the same speed because one is heavier than the other, well then if that's the case then they shouldn't have the same kinetic energy either yet they do,

so i guess iam asking...fill in the blank: if speed is weight dependent, then kinetic energy is ______dependent?

please help clarify this, thanks

kinetic energy is the measure of the average temperature i believe. The situation with Ne and He is that since Ne is heavier it will generally move slower than He. However, the average kinetic energy for both He and Ne are the same.

I believe that is correct. someone correct me if i am wrong.

 

[doc toothache]

ok, it says that Ne and He have the same kinetic energy (according to the kinetic molecular theory) but they do NOT have the same speed since Ne is heavier and therefore denser than He

but isn't kinetic energy directly proportional to speed?? forexample: catalysts act on the kinetics of the reaction by "speeding" up the rate, so an increase in kinetic energy causes increase in speed or motion of a molecule,

I don't understand why in that situation with the Ne and He they make the distinction between "kinetic energy" and "speed", if they have the same kinetic energy then they should have the same speed.

you might say they don't have the same speed because one is heavier than the other, well then if that's the case then they shouldn't have the same kinetic energy either yet they do,

so i guess iam asking...fill in the blank: if speed is weight dependent, then kinetic energy is ______dependent?

please help clarify this, thanks

E(k)= 1/2 mv*2

 

[Flipper405]

E(k)= 1/2 mv*2

exactly...
kinetic energy is dependent both on mass and velocity.
Wikipedia gives the definition of kinetic energy as the work needed to accelerate a body of a given mass from rest to its current velocity, so this might help visualize why it's dependent on both. The higher the velocity, the high the energy will be. Also, for a given velocity, the required energy to move a more massive object will be higher than one that has a lower mass.

 

[levyusupov]

this is Graham's law for speed of gases.

where M is the mass of each gas. plug-in the numbers and get the ratios of the two gases and u will see which gas is faster.