STP vs Standard State + Circuits

[SilvrGrey330]

One is at 25 degrees C/298K

other is 0 degrees C/273 K,

which is which?
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In circuits,

when the battery is like - il +


I thought I (current) moves from + to -
and electrons move from - to +

but dont electrons move from High Potential to Low? If so, how can the above me justified? because i thought high potential was the + terminal.

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[QofQuimica]

STP is used for the ideal gas law, and it is 273K, 1 atm of pressure. Memorize that 1 mole of ideal gas at STP occupies 22.4 L.

Standard conditions is used for thermodynamics problems, and it is 298K, 1 atm pressure, 1 M concentrations of all compounds.

One helpful hint for doing general chemistry questions on the MCAT: always remember to convert your temperature to Kelvins. The only time this doesn't matter is if you have a delta T, since the size of a Kelvin is the same as the size of a Celsius degree and you are taking the difference in that case. But if there isn't a delta, you must convert to K.

Good luck to all of you MCATers.

 

[cfdavid]

STP (standard temperature and pressure) is 0deg Celsius (273K) and 1 atm
*For gas problems, use this.

Standard State is 25deg C (298K), which is used in thermodynamics probs.

Don't think this stuff will be too critical for the MCAT, but who knows.

 

[QofQuimica]

Sorry, I just saw your second question. Electrons are negative charges, so they would travel backward up the equipotential lines. It is positive charges that go from high potential to low potential. Remember that you must reverse everything when dealing with a negative test charge like an electron.

 

[cfdavid]

my computer is so slow, i didn't know this was already answered.

 

[Shrike]

Sorry, I just saw your second question. Electrons are negative charges, so they would travel backward up the equipotential lines. It is positive charges that go from high potential to low potential. Remember that you must reverse everything when dealing with a negative test charge like an electron.

I think you mean backward across the equipotential lines (and along the field lines). Or, perhaps, this is a different way of saying the same thing.

 

[BaylorGuy]

The current (hypothetical flow of protons) goes from high potential to low potential...electrons flow from low potential to high potential.

If you think about it...if one of the particles goes from high to low, the other has to go from low to high. Thus the entire reason for why there is a charge distribution...a "+" and a "-" on a battery or capacitor.

 

[SilvrGrey330]

thanks to everyone...Baylor hit the answer i was looking for. e- go from Low Po to High Po and protons go from High Po to low Po...and the rule applys perfectly to batter and capacitor.

one of the kaplan tests confused me between standard state and stp...all because i didnt use the correct value for temp

 

[gujuDoc]

thanks to everyone...Baylor hit the answer i was looking for. e- go from Low Po to High Po and protons go from High Po to low Po...and the rule applys perfectly to batter and capacitor.

one of the kaplan tests confused me between standard state and stp...all because i didnt use the correct value for temp

I think that Q answered the question above if you reread it. Just thought I would point that out. Good luck Saturday.