Phase Change Assessment

Front

What is a phase change?

Back

A phase change is the transformation of a substance from one state of matter to another, such as solid to liquid or liquid to gas.

Front

What happens to the movement of molecules during freezing?

Back

During freezing, the molecules lose energy, move slower, and begin to arrange themselves into a fixed structure.

Front

What is kinetic energy?

Back

Kinetic energy is the energy that an object possesses due to its motion. In the context of molecules, it increases as they move faster.

Front

How does temperature affect molecular movement?

Back

As temperature increases, molecules gain energy and move faster; as temperature decreases, they lose energy and move slower.

Front

What occurs during melting?

Back

During melting, a solid absorbs heat energy, causing its molecules to move faster and break free from their fixed positions.

Front

What is the difference between evaporation and boiling?

Back

Evaporation occurs at the surface of a liquid at any temperature, while boiling occurs throughout the liquid at a specific temperature.

Front

What happens to the molecules of a substance when it condenses?

Back

When a substance condenses, its molecules lose energy, move closer together, and transition from a gas to a liquid.

Front

What is sublimation?

Back

Sublimation is the phase change in which a solid turns directly into a gas without passing through the liquid state.

Front

What is the role of energy in phase changes?

Back

Energy is required to change the phase of a substance; it can be absorbed or released during the process.

Front

What is the state of matter of water at 0°C?

Back

At 0°C, water can exist as both a solid (ice) and a liquid, depending on the conditions.