Give the correct names for these changes in state: (a)...

Give the correct names for these changes in state: (a) Crystals of para-dichlorobenzene, used as a moth repellent, gradually become vapor without passing through the liquid phase. (b) As you enter a warm room from the outdoors on a cold winter day, your eyeglasses become fogged with a film of moisture. (c) On the same (windy) winter day, a pan of water is left outdoors. Some of it turns to vapor, the rest to ice.

Give the correct names for these changes in state: (a) Crystals of para-dichlorobenzene, used as a moth repellent, gradually become vapor without passing through the liquid phase.
(b) As you enter a warm room from the outdoors on a cold winter day, your eyeglasses become fogged with a film of moisture. (c) On the same (windy) winter day, a pan of water is left outdoors. Some of it turns to vapor, the rest to ice.

Key Concepts

Evaporation

Evaporation is the process by which molecules on the surface of a liquid gain sufficient energy to overcome intermolecular forces and escape into the gaseous state. It commonly occurs at temperatures below the boiling point and is influenced by environmental conditions such as temperature and airflow.

Condensation

Condensation is the transition in which a substance changes from its gaseous state to its liquid state. Typically occurring when the gas is cooled or comes into contact with a cooler surface, it results in the formation of liquid droplets from the vapor.

Freezing

Freezing is the phase transition whereby a liquid transforms into a solid when its temperature is lowered. During freezing, the molecules of the liquid arrange themselves into a structured, often crystalline, formation, resulting in a solid state.

Phase Transition

A phase transition is the process by which a substance changes from one state of matter to another, such as solid to liquid, liquid to gas, or vice versa. This concept underlies all the changes described and is driven primarily by variations in temperature and pressure.

Sublimation

Sublimation is the phase transition where a substance moves directly from the solid state to the gaseous state without passing through the intermediate liquid phase. This process occurs under specific conditions of pressure and temperature, bypassing the liquid phase entirely.

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