Home › AP Chemistry › Chemistry › Thermodynamics › When the entropy change of the universe is zero,…
When the entropy change of the universe is zero, the system is:
AWholly forbidden
BPerfectly crystalline
CAt equilibrium
DFully spontaneous
Answer & Solution
Correct answer: C. At equilibrium
1. The sign of the universe's entropy change classifies the process.
2. Spontaneous change increases the entropy of the universe.
3. In one case the entropy change of the universe is zero.
4. In that case the system is at equilibrium.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 16 'Thermodynamics', sections 16.1-16.4_
Related questions
A perfect crystal at 0 K has W equal to 1, which makes its entropy:Boltzmann's model related the entropy of a system to which quantity?An endothermic process that involves an increase in system entropy is spontaneous when temA process whose enthalpy and entropy changes share the same arithmetic sign will show:At minus 10.00 degrees Celsius the entropy change of the universe for melting is negative,Melting is described as spontaneous at 10.00 degrees Celsius because at that temperature:Free energy is described as the energy available to do useful work, being the difference bBesides indicating spontaneity, the free energy change gives information about the amount