Draw conclusions from a phase change graph

What is the phase change called when a solid turns into a liquid?

• Condensation

• Melting

• Freezing

• Sublimation

Identify the phase change that occurs when a gas turns into a liquid.

• Evaporation

• Freezing

• Condensation

• Sublimation

Explain why the temperature remains constant during the phase change from liquid to gas.

• Because the energy is used to increase the temperature

• Because the energy is used to break intermolecular bonds (how attracted the molecules are to each other)

• Because the energy is lost to the surroundings

• Because the energy is used to decrease the temperature

What happens to the kinetic energy of particles during the phase change from solid to liquid?

• It decreases

• It remains constant

• It increases

• It fluctuates

A phase change graph shows a flat line at 100°C for water. What phase change is occurring at this temperature?

• Freezing

• Melting

• Boiling

• Sublimation

Describe the energy changes that occur during the phase change from liquid to solid.

• Energy is absorbed, and temperature increases

• Energy is released, and temperature decreases

• Energy is absorbed, and temperature decreases

• Energy is released, and temperature increases

Why does the temperature of a substance not change during a phase change, even though heat is being added?

• The heat is used to increase the temperature

• The heat is used to change the state of the substance

• The heat is lost to the surroundings

• The heat is used to decrease the temperature

What is the term for the phase change from gas directly to solid?

• Deposition

• Sublimation

• Condensation

• Freezing

If a substance is undergoing a phase change from solid to liquid, what can be said about the potential energy of the particles?

• It decreases

• It remains constant

• It increases

• It fluctuates

During which phase change does a substance absorb energy but not change temperature?

• Freezing

• Melting

• Condensation

• Deposition