QQuestionPhysics
QuestionPhysics
"Sublimation is a direct transition from the solid to gas state and is an _______ process, while deposition is a direct transition from the gas to solid state and is an _______ process.
a. endothermic; exothermic
b. endothermic; endothermic
c. exothermic; endothermic
d. exothermic; exothermic"
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand the Definitions
- Sublimation: Direct transition from solid to gas state - Deposition: Direct transition from gas to solid state
Step 3:: Analyze Energy Changes in Sublimation
- Mathematically, this can be represented as: $$\Delta H > 0$$ (positive enthalpy change)
- Sublimation requires energy to break intermolecular bonds in the solid - Breaking bonds requires an input of energy - This means sublimation is an endothermic process
Step 4:: Analyze Energy Changes in Deposition
- Mathematically, this can be represented as: $$\Delta H < 0$$ (negative enthalpy change)
- Deposition involves gas molecules condensing and forming solid bonds - This process releases energy to the surroundings - This means deposition is an exothermic process
Step 5:: Match the Characteristics
- Sublimation is endothermic - Deposition is exothermic
Final Answer
The correct option is c. endothermic; exothermic.
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