Which process is an example of sublimation?
Show the answer and explanation
Correct answer
A. Solid carbon dioxide (dry ice) turning directly into carbon dioxide gas
Principle or equation
Sublimation is the direct transition from solid to gas without passing through the liquid phase. Deposition is the reverse (gas to solid).
Why this answer is correct
Dry ice (solid CO2) changes directly to gaseous CO2 at room temperature, which is sublimation. Boiling is liquid to gas (vaporization). Iodine vapor to solid is deposition. Melting is solid to liquid.
Example
Solid iodine heated gently produces purple vapor without melting; this is sublimation.
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