Free expansion of an ideal gas: values of q, w and dU

1. A.
   $q = 0,\Delta T \neq 0,w = 0$
2. B.
   $q = 0,\Delta T < 0,w \neq 0$
3. C.
   $q \neq 0,\Delta T = 0,w = 0$
4. D.
   $q = 0,\Delta T = 0,w = 0$

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1. A.
   $dw \neq 0$
2. B.
   $dq \neq 0$
3. C.
   $dU \neq 0$
4. D.
   The pressure in the vessel B before opening the stopcock is zero.

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