Answer and Explanation:
a. Solid melting below its melting point ⇒ Nonspontaneous
The process is spontaneous <u>above</u> the melting point.
b. Gas condensing below its condensation point ⇒ Spontaneous
Below the condensation point, the subtance is liquid (it condenses)
c. Liquid vaporizing above its boiling point ⇒ Spontaneous
A liquid vaporizes at a temperature above the boiling point, it passes from liquido to the gas state
d. Liquid freezing below its freezing point ⇒ Spontaneous
A liquid freezes at a temperature below its freezeing point, it passes from the liquid to the solid state.
e. Liquid freezing above its freezing point ⇒ Nonspontaneous
The freezing is spontaneous below the freezing point.
f. Solid melting above its melting point ⇒ Spontaneous
A solid melts at a temperature above the melting point
g. Liquid and gas together at boiling point with no net condensation or vaporization ⇒ Equilibrium system
The systems is at equilibrium: there is no net change toward the liquid or towards the gas state.
h. Gas condensing above its condensation point ⇒ Nonspontaneous
The condensation is spontaneous at a temperature below the condensation point.
i. Solid and liquid together at the melting point with no net freezing or melting ⇒ Equilibrium system
The system is at equilibrium: there is no net change towards the solid or the liquid state.
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