Identify each of the following changes of state as melting,...

Identify each of the following changes of state as melting, freezing, sublimation, or deposition: a. Dry ice in an ice-cream cart disappears. b. Snow on the ground turns to liquid water. c. Heat is removed from $125 \mathrm{g}$ of liquid water at $0^{\circ} \mathrm{C}$ d. Frost (ice) forms on the walls of a freezer unit of a refrigerator.

Identify each of the following changes of state as melting, freezing, sublimation, or deposition:
a. Dry ice in an ice-cream cart disappears.
b. Snow on the ground turns to liquid water.
c. Heat is removed from $125 \mathrm{g}$ of liquid water at $0^{\circ} \mathrm{C}$
d. Frost (ice) forms on the walls of a freezer unit of a refrigerator.

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Key Concepts

Phase Changes

Phase changes involve the transformation of a substance from one state of matter to another, such as from solid to liquid or from liquid to gas, and generally involve the absorption or release of latent heat without a change in temperature during the process.

Melting

Melting is the process where a solid absorbs heat and transitions into a liquid state. This change occurs when the energy added to the system overcomes the forces holding the particles in the solid structure.

Freezing

Freezing is the process where a liquid loses heat and transforms into a solid state. During freezing, the molecular motion slows down, and intermolecular forces overcome kinetic energy, leading to a structured solid form.

Sublimation

Sublimation is the process in which a solid turns directly into a gas without becoming liquid first. This phase transition occurs under conditions where the vapor pressure of the solid exceeds the atmospheric pressure, allowing molecules to escape directly into the gaseous state.

Deposition

Deposition is the reverse of sublimation, where a gas transforms directly into a solid without passing through the liquid state. This process typically occurs when the gas is cooled rapidly, causing its molecules to settle into a solid formation.

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