Phase Change Exam

Front

What is a phase change?

Back

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

Front

What happens to molecules during a phase change?

Back

Molecules either gain or lose energy, which affects their movement and the state of the substance.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of motion. In the context of molecules, it refers to how fast the molecules are moving.

Front

What occurs during condensation?

Back

Condensation is the phase change from gas to liquid, where gas molecules lose energy and come closer together.

Front

What happens to molecules when energy is added?

Back

When energy is added, molecules move faster and may change from a solid to a liquid or from a liquid to a gas.

Front

What is the effect of temperature on molecular movement?

Back

As temperature increases, molecular movement increases; as temperature decreases, molecular movement decreases.

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 is the melting point?

Back

The melting point is the temperature at which a solid becomes a liquid.

Front

What is the freezing point?

Back

The freezing point is the temperature at which a liquid becomes a solid.

Front

What is sublimation?

Back

Sublimation is the phase change from solid directly to gas without passing through the liquid state.