HeadphoneMonster wrote:Find the work performed by 2.5 moles of oxygen isothermally expanding at 25◦C from 1.5 atm to .75 atm of pressure.(Answer preferred in Joules).
Generally, the person who answers asks the question, but it's fine.
Correct me if I'm wrong (especially if I messed up the final number of significant digits).
Justin can go.
Sorry my bad. The answer is right but I think it would be better to leave it with out rounding sig figs.
Sorry Justin
Re: Thermodynamics B/C
Posted: September 5th, 2018, 4:32 pm
by UTF-8 U+6211 U+662F
HeadphoneMonster wrote:
UTF-8 U+6211 U+662F wrote:
HeadphoneMonster wrote:Find the work performed by 2.5 moles of oxygen isothermally expanding at 25◦C from 1.5 atm to .75 atm of pressure.(Answer preferred in Joules).
Generally, the person who answers asks the question, but it's fine.
Correct me if I'm wrong (especially if I messed up the final number of significant digits).
Justin can go.
Sorry my bad. The answer is right but I think it would be better to leave it with out rounding sig figs.
Sorry Justin
Nah, the rules specifically ask for sig figs (which is appropriate since this is a physics event after all and not just mathematics, so measurement precision seems important).
Also, no harm done
Re: Thermodynamics B/C
Posted: September 5th, 2018, 7:17 pm
by Things2do
UTF-8 U+6211 U+662F wrote:
Correct me if I'm wrong (especially if I messed up the final number of significant digits).
Your Sig. Figs. are correct, at least as far as I can tell.
Re: Thermodynamics B/C
Posted: September 5th, 2018, 7:20 pm
by UTF-8 U+6211 U+662F
Things2do wrote:
UTF-8 U+6211 U+662F wrote:
Correct me if I'm wrong (especially if I messed up the final number of significant digits).
Your Sig. Figs. are correct, at least as far as I can tell.
Thanks, I always get confused when a logarithm is involved. (Is the mantissa significant? The characteristic? How many sigfigs do I keep? AAAAAAAH PANIC MODE)
Interestingly enough, there's a significant figure policy on soinc.org, but it only bothers with basic operations, which is strange when logarithms are ridiculously useful in Science Olympiad, even in B division (Thermodynamics B for one), even if they aren't usually found on B division tests.
Re: Thermodynamics B/C
Posted: September 6th, 2018, 3:06 am
by Justin72835
HeadphoneMonster wrote:
Sorry Justin
Don't worry about it haha.
How many kilograms of water at 0 degrees Celcius can a freezer with a COP of 6 turn into ice at 0 degrees Celsius with a work input of 4 MJ?
Re: Thermodynamics B/C
Posted: September 17th, 2018, 7:36 am
by Jacobi
Justin72835 wrote:
HeadphoneMonster wrote:
Sorry Justin
Don't worry about it haha.
How many kilograms of water at 0 degrees Celcius can a freezer with a COP of 6 turn into ice at 0 degrees Celsius with a work input of 4 MJ?
2 kg (I used sig figs)
Re: Thermodynamics B/C
Posted: September 28th, 2018, 7:07 pm
by UTF-8 U+6211 U+662F
Starting this up again...
Is a reaction with a positive change in enthalpy exergonic or endergonic?
Re: Thermodynamics B/C
Posted: September 28th, 2018, 7:38 pm
by TheChiScientist
If I remember correctly... Would it be endergonic?
Re: Thermodynamics B/C
Posted: September 29th, 2018, 9:19 am
by UTF-8 U+6211 U+662F
TheChiScientist wrote:If I remember correctly... Would it be endergonic?
Yep, your turn.
Re: Thermodynamics B/C
Posted: September 29th, 2018, 4:44 pm
by TheChiScientist
At what temperature are Celsius and Fahrenheit the same?
