Question

question 4 (5 points)
listen
one day in the chemistry lab students put a few pieces of dry ice into a beaker. (dry ice is solid, frozen carbon dioxide.) they see vapor rising from the dry ice, but no liquid, as it slowly disappears into the air at room temperature. what kind of phase transition did the students observe?
a) deposition
b) evaporation
c) melting
d) sublimation

Explanation:

To determine the phase transition, we analyze each option:

• Option A (Deposition): Deposition is the phase transition from gas to solid, which is the reverse of what's observed here. So A is incorrect.
• Option B (Evaporation): Evaporation is the transition from liquid to gas. But dry ice is solid, not liquid, so B is incorrect.
• Option C (Melting): Melting is the transition from solid to liquid. However, the dry ice disappears into the air as a gas, not a liquid, so C is incorrect.
• Option D (Sublimation): Sublimation is the phase transition where a substance changes directly from the solid phase to the gas phase without passing through the liquid phase. Dry ice (solid \( \text{CO}_2 \)) turning directly into gaseous \( \text{CO}_2 \) at room temperature fits this definition.

Answer:

D) Sublimation