7th Grade Phase Change Review Amplify

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, often due to energy being added or removed.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of motion. The faster the molecules move, the higher their kinetic energy.

Front

How does temperature affect molecular movement?

Back

As temperature increases, molecules move faster; as temperature decreases, molecules move slower.

Front

What is molecular attraction?

Back

Molecular attraction refers to the forces that hold molecules together. Stronger attractions result in solids, while weaker attractions allow for liquids and gases.

Front

What occurs when energy is added to a liquid?

Back

When energy is added to a liquid, its molecules may move faster, potentially leading to a phase change if enough energy is supplied.

Front

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

Back

In solids, molecules vibrate in place; in liquids, molecules can move around each other.

Front

What happens to a substance's phase when it absorbs enough energy?

Back

If a substance absorbs enough energy, it can change from a solid to a liquid (melting) or from a liquid to a gas (vaporization).

Front

What is evaporation?

Back

Evaporation is the process by which molecules at the surface of a liquid gain enough energy to enter the gas phase.

Front

What is condensation?

Back

Condensation is the process by which gas molecules lose energy and transition back into the liquid phase.