Difference between revisions of "PChem312 f20 w3"
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Continue reading chapter 2 | Continue reading chapter 2 | ||
| + | ====Sec 2.1: Internal Energy and !st Law of Thermodynamics==== | ||
U <-- internal energy (1st thermodynamic state function) | U <-- internal energy (1st thermodynamic state function) | ||
:U<sub>f</sub> - U<sub>i</sub> = ΔU, the change in the internal energy | :U<sub>f</sub> - U<sub>i</sub> = ΔU, the change in the internal energy | ||
| + | ::* we cannot measure U<sub>f</sub> or U<sub>i</sub>, only ΔU. | ||
'''First Law of Thermodynamics''': the change in the system's internal energy is equal to, but opposite in sign, to the change in the surround's internal energy. | '''First Law of Thermodynamics''': the change in the system's internal energy is equal to, but opposite in sign, to the change in the surround's internal energy. | ||
:ΔU<sub>sys</sub> = - ΔU<sub>surr</sub> | :ΔU<sub>sys</sub> = - ΔU<sub>surr</sub> | ||
| + | How does one measure ΔU? | ||
| + | :- changes in the system variables (ΔP, ΔV, ΔT, Δn) are an indication of ΔU. | ||
| − | + | :::ΔP, ΔV, ΔT, Δn --> q (heat), w (work) --> ΔU | |
====Sec 2.2: Heat==== | ====Sec 2.2: Heat==== | ||
Revision as of 13:43, 31 August 2020
Monday, Aug 31, 2020
Continue reading chapter 2
Sec 2.1: Internal Energy and !st Law of Thermodynamics
U <-- internal energy (1st thermodynamic state function)
- Uf - Ui = ΔU, the change in the internal energy
- we cannot measure Uf or Ui, only ΔU.
First Law of Thermodynamics: the change in the system's internal energy is equal to, but opposite in sign, to the change in the surround's internal energy.
- ΔUsys = - ΔUsurr
How does one measure ΔU?
- - changes in the system variables (ΔP, ΔV, ΔT, Δn) are an indication of ΔU.
- ΔP, ΔV, ΔT, Δn --> q (heat), w (work) --> ΔU
Sec 2.2: Heat
Sec 2.2: Work
Wednesday, Sept 2, 2020
Thursday, Sept 3, 2020
Meet in CSB 378