Which of the following phase transitions is/are endothermic?
1)liquid water freezing to a solid at its normal freezing point of 0.0 $\circ$ C.
2)the sublimation of solid carbon dioxide into the gas phase.
3)gaseous sulfur dioxide condensing into a liquid at its boiling point of -10.0 $\circ$ C.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

Question

Quizplus · Accepted Answer

An endothermic phase transition absorbs heat from the surroundings, while an exothermic phase transition releases heat to the surroundings. 
1) Freezing of liquid water is an exothermic process. 
2) Sublimation of solid carbon dioxide is an endothermic process because it requires energy to break the intermolecular forces and overcome the solid's lattice energy. 
3) Condensation of gaseous sulfur dioxide is an exothermic process. 
Therefore, only option 2, the sublimation of solid carbon dioxide into the gas phase, is endothermic.

Which of the Following Phase Transitions Is/are Endothermic? 1)liquid Water ∘\circ∘

Which of the Following Phase Transitions Is/are Endothermic?
1)liquid Water $\circ$