Phase Changes and Energy Transfer

The video tutorial explains a phase change graph, illustrating how energy increases along the x-axis while temperature is plotted on the y-axis. It describes the process of phase changes, such as melting and vaporization, where temperature remains constant. The tutorial highlights that freezing and melting occur at the same temperature, as do boiling and condensing. It also discusses the behavior of particles during these transitions and the conditions under which condensation can occur at temperatures lower than boiling.

What does the x-axis represent in the phase change graph?

• Temperature

• Time

• Pressure

• Energy

At what temperature does vaporization occur according to the video?

• 150°C

• 0°C

• 100°C

• 50°C

Which two processes occur at the same temperature?

• Condensing and freezing

• Freezing and melting

• Vaporization and melting

• Melting and boiling

What happens to the temperature during a phase change?

• It decreases

• It fluctuates

• It remains constant

• It increases

What phase is the substance in when the graph shows a horizontal line at 0°C?

• Liquid

• Solid

• Solid and liquid

• Gas

What is the process called when a liquid turns into a gas?

• Condensation

• Freezing

• Melting

• Vaporization

What happens to the particles as they gain more energy during vaporization?

• They move closer together

• They slow down

• They fly out into space

• They stop moving

What is the term for the phase change from gas to liquid?

• Vaporization

• Condensation

• Melting

• Sublimation

During which phase change does the temperature remain constant at 100°C?

• Freezing

• Condensation

• Boiling

• Melting

What happens to the temperature of a gas once all the liquid has evaporated?

• It increases

• It fluctuates

• It decreases

• It remains constant