2. DS for the universe is:
always positive sometimes positive always negative sometimes negative constant
3. If an endorthermic reaction is spontaneous at 298 K, which of the following must be true for the reaction?
DG is greater than zero DG is greater than zero DG and DH are greater than zero DH and DS are greater than zero DG, DH, DS are all greater than zero
4. Liquid sample A freezes at -8°C. Determine the signs of DH, DS, and DG.
+,+,+ +,-,- -,-,- -,+,0 None of the above
5. For the gas sample B, this reaction is endothermic: B-->2B. The reaction is:
always spontaneous only at high temperatures only at low temperatures never spontaneous none of the above
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