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19 Cards in this Set
- Front
- Back
What is w?
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w = -pex∆V (work for expansion of a gas) δw = -pdV |
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What is U?
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internal energy (= potential + kinetic) |
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Zeroth law?
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If A is in thermal equilibrium with B and B is in thermal equilibrium with C then A is in thermal equilibrium with C.
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1st law?
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∆U = q + w for a closed system |
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State functions? |
Path independant |
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non-state functions? |
Path dependant i.e. p, V, T etc
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how can d(uv) be manipulated into an easier form?
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knowing dudv to be negligible d(uv) = udv + vdu |
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how can dh(x, y) be manipulated?
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Heat capacity at constant volume?
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Cv = (∂U/∂T)V |
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dq?
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dq = CvdT (heat capacity x change in T) |
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Define adiabatic?
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No heat exchange with surroundings |
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How can Cv and ∆U be obtained?
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adiabatic bomb calorimeters
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Enthalpy?
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(we can choose between p, T and V because there in an equation of state linking them but we can only vary two independently) |
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Why is H often more useful than U?
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dH(p, T) = dqp |
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Heat capacity at constant pressure?
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gives us dH = CpdT = dqp |
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How are ∆H and Cp obtained? |
isobaric calorimeters |
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Define isobaric?
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process where pressure is constant
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How are the two heat capacities related in a perfect gas?
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Cp - Cv = nR |
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