Phase Change Assessment

Front

What is a phase change?

Back

A phase change is a transition of matter from one state (solid, liquid, gas) to another due to the addition or removal of energy.

Front

What happens to molecules during a phase change?

Back

During a phase change, the arrangement and movement of molecules change as energy is added or removed, affecting their kinetic energy.

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 when energy is added to a solid?

Back

When energy is added to a solid, its molecules gain kinetic energy, causing them to vibrate more and eventually break free from their fixed positions, leading to a phase change to a liquid.

Front

What occurs when energy is removed from a gas?

Back

When energy is removed from a gas, its molecules lose kinetic energy, move closer together, and can change phase to a liquid.

Front

What is the relationship between temperature and molecular movement?

Back

As temperature increases, the kinetic energy of molecules increases, causing them to move faster. Conversely, as temperature decreases, molecular movement slows down.

Front

What happens to the molecules of water when it freezes?

Back

When water freezes, its molecules slow down and arrange themselves into a fixed, orderly structure, forming a solid.

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 (boiling point).

Front

What is condensation?

Back

Condensation is the process by which gas molecules lose energy and transition into a liquid state.

Front

What is sublimation?

Back

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