Unit 4 Assessment (Essential Level)

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or state. It can be converted to kinetic energy when the object moves.

Front

What happens to potential energy during melting?

Back

During melting, potential energy increases as the molecules gain energy to overcome intermolecular forces.

Front

What is the difference between heat and temperature?

Back

Heat is energy in transit due to a temperature difference, while temperature is a measure of the average kinetic energy of particles in a substance.

Front

Which phase change requires heat absorption?

Back

Melting requires the absorption of heat to convert a solid into a liquid.

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 or liquid to gas.

Front

What does the flat portion of a heating curve represent?

Back

The flat portion of a heating curve represents a phase change, where temperature remains constant while heat is added.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object due to its motion, calculated as 1/2 mv², where m is mass and v is velocity.

Front

What is the process of freezing?

Back

Freezing is the phase change from liquid to solid, occurring when a substance loses heat.

Front

What is condensation?

Back

Condensation is the phase change from gas to liquid, occurring when gas particles lose energy and come together.

Front

What is boiling?

Back

Boiling is the phase change from liquid to gas that occurs throughout the liquid at a specific temperature.