Gen chem question--Internal Energy

[Troyvdg]

While doing kaplan problems, I noticed that Kaplan defines internal energy as DE= q-w, but in chad's videos he defined it as DE=q+w. For the DAT aren't we supposed to use the DE= q+w equation? since there's no physics on the test

thanks for the help!

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[UndergradGuy7]

While doing kaplan problems, I noticed that Kaplan defines internal energy as DE= q-w, but in chad's videos he defined it as DE=q+w. For the DAT aren't we supposed to use the DE= q+w equation? since there's no physics on the test

thanks for the help!

E= q+w

Not sure what they mean by q-w unless they are including the sign from the w=-p*v

 

[Troyvdg]

E= q+w

Not sure what they mean by q-w unless they are including the sign from the w=-p*v

ohh good point, i guess theyre doing that.
thanks for the help!

 

[yappy]

I think the key is to know what is going on when doing this calc. In one eq they're already subtracting the values for you... in the other they're assuming the values are neg. You can use either one just doing do BOTH. ei making a - number positive by both subtracting assigning it a neg number from a data table.