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constants
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1. 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

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

3. A change of state occurs within a system and produces 64.0 kB of heat which is transferred to the surrounding at a constant pressure and a constant temperature of 300K. For this process DSsurroundings is:
64.0 kJ
-64.0 kJ
-213 J/K
213 J/K
none of these

4. The second law of thermodynamics states that:
the entropy of a perfect crystal is zero at 0 K.
the entropy of the universe is constant
the energy of the universe is increasing.
the entropy of the universe is increasing.
the energy of the universe is constant.

5. For the phase change of liquid to solid, DS is:
0
positive
negative
positive at high temperature
none of the above

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