Question

For a single substance at atmospheric pressure, classify the following as describing a spontaneous process, a nonspontaneous process, or an equilibrium system. 

Drag the appropriate items to their respective bins.  

Determine whether each of these processes is reversible or irreversible. 

Drag the appropriate items to their respective bins.

Answer 1

Answer 1.
solid melting below its melting point - non-spontaneous
gas condense below condensation point - spontaneous
liquid vaperize above its boiling point - spontaneous
liquid vaporizing below its boiling point - non-spontaneous
liquid freezing below its freezing point - spontaneous
liquid freezing above its freezing point - non-spontaneous
solid melting above its melting point - spontaneous
liquid and gas together at the boiling point with no net condensation or vaporization - equilibrium
gas condensing above its condensation point - non-spontaneous
solid and liquid together at the melting point with no net freezing or melting - equilibrium

Answer 2.
solid melting infinitesimally slowly at its melting point - reversible
a single swing of a real pendulum - irreversible
gas condensing infinitesimally slowly at its condensation point - reversible
a single swing of a frictionless pendulum - reversible
liquid vaporizing above its boiling point - irreversible
liquid freezing infinitesimally slowly at its freezing point - reversible
solid melting infinitesimally slowly above its melting point - irreversible
liquid vaporizing infinitesimally slowly at its boiling point - reversible
liquid freezing below its freezing point - irreversible
gas condensing below its condensation point - irreversible