2. 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
3. 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.
4. 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
5. For a reaction, the DS = -30J/K and DH=25kJ. Is this reaction spontaneous at STP?
no yes need more info only at high pressures only at low pressures
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