2. Liquid sample A freezes at -8°C. Determine the signs of DH, DS, and DG.
+,+,+
+,-,-
-,-,-
-,+,0
None of the above

3. 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

4. Choose the correct statement.
Exothermic reactions are always spontaneous
High temperature ensures a spontaneous reaction
Free energy is independent of temperature
A reaction with negative DS cannot be spontaneous
none of the above

5. DS for the universe is:
always positive
sometimes positive
always negative
sometimes negative
constant

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