Chemistry

Question Analysis
This question involves defining a pair of reverse phase changes and providing real-world examples. The main focus is on linking terminology to both definitions and observable phenomena.

Key Concept Explanation
Sublimation and deposition are direct solid-gas phase transitions that skip the liquid phase.
Sublimation requires energy to overcome intermolecular forces (endothermic), while deposition releases energy as molecules arrange into a solid structure (exothermic).

Step-by-Step Solution
1. Define sublimation: Solid → Gas, endothermic, no liquid phase.
2. Provide a real-world example of sublimation (dry ice).
3. Define deposition: Gas → Solid, exothermic, no liquid phase (reverse of sublimation).
4. Provide a real-world example of deposition (frost formation).
5. Answer: Sublimation is the endothermic phase change in which a solid transitions...