Phase Change Diagram Lab Chem Review

Use the phase change diagram above to match the portion of the diagram to the appropriate description.

• B to C

• heat energy is being added, temperature is CONSTANT, the substance is starting to evaporate (vaporization)

• D to E

• heat energy is being added, temperature is increasing, particles are beginning to move more rapidly

• E & beyond

• heat energy is still being added, temperature is CONSTANT, the solid is melting

• A to B

• heat energy continues to be added, temperature continues to increase, the substance is in the gas phase

• C to D

• heat energy is being added, temperature is increasing, the substance is in the liquid phase and the particles are moving increasingly more rapidly

Does the temperature increase during melting?

• True

• False

Is energy required for each phase change?

• True

• False

How would you describe the change in the arrangement of particles as heat energy and temperature increase?

• Particles move closer together

• Particles move farther apart

• No change in the arrangement of particles

• Particles change from solid to liquid

What can you state about the relationship between phase changes and temperature?

• Temperature remains constant during a phase change.

• Temperature increases rapidly during a phase change.

• There is no relationship between phase changes and temperature.

• Temperature decreases during a phase change.

What can you state about the relationship between phase changes and heat energy?

• Heat energy is absorbed or released during phase changes

• Phase changes occur without any heat energy exchange

• Heat energy and phase changes are unrelated

• Phase changes alter the chemical composition of a substance

5. What is it called when a solid turns directly into a gas?

• Sublimation
• Condensation
• Liquid

The phase change from water vapor to liquid water is known as...

• evaporation
• precipitation
• condensation
• sublimation

2. A change of state from a liquid to a solid is called....

• Melting
• Freezing
• Evaporation

Phase change going from a Gas to a Liquid...

• Sublimation

• Deposition

• Ionization

• Condensation