P.1 Phase Change Mid-Unit Flashcard

Front

What is a phase?

Back

A noticeably different form or state of the same substance.

Front

Describe the movement of molecules in a liquid and gas.

Back

In a liquid, molecules move around each other; in a gas, they move away from each other.

Front

What happens to molecules when a liquid changes to a solid?

Back

Before: molecules move around each other; After: molecules move in place.

Front

What is the process called when liquid water changes to an ice cube?

Back

Freezing (congelación).

Front

Which phase of matter has tightly packed molecules that only vibrate in place?

Back

Solid.

Front

What is vaporization?

Back

The process of a liquid changing into a gas.

Front

What is condensation?

Back

The process of a gas changing into a liquid.

Front

What is melting?

Back

The process of a solid changing into a liquid.

Front

What is the difference between a solid and a gas in terms of molecular movement?

Back

Solids have molecules that are tightly packed and vibrate in place, while gases have molecules that move freely and are far apart.

Front

What happens to the energy of molecules during freezing?

Back

The energy decreases, causing molecules to slow down and become more tightly packed.