chem chapter 5

kinetic molecular theory
- a way to visualize what the molecules are doing
- E_k = 1/2mv² m = mass v=velocity
- *both affect the kinetic energy
one
- molecules (or atoms) of gases are continuously in motion
- always have NRG
two

the volume of gas molecules is negligible compared to the volume of the container
three
- the attractive and repulsive forces of gas molecules are negligible
- no affect on NRG transfer during a collision
four
- as long as the temperature remains constant, the average kinetic energy of the molecules is constant
- individual molecules can transfer NRG from one to another, but the average remains constant.
five
- the average kinetic energy is directly proportional to absolute temperature
- not dependent on the identity of gas
- all gases have the same average NRG at same temperature
pressure is a result of...

collisions of molecules with sides of container
increase V at constant T and n...
- # of collisions of molecs with the wall of container decreases
- volume goes up, pressure goes down P₁V₁ = P₂V₂
increase T at constant V and n...
- increase T
- increase average kinetic NRG
- increase # of collisions & speed of collisions
- overall...pressure goes up
- P₁/T₁ = P₂/T₂

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Card Set

chem chapter 5

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october 28, 2010

Updated

2010-10-29T04:58:59Z

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