Phase Changes in the States of Matter

Phase ​ (a)   is when a substance ​ (b)   from a solid, liquid, or gas state to a different state. Every ​ (c)   and substance can transition from one phase to another at a specific combination of ​ (d)   .

• transition
• changes
• element
• temperature and pressure
• phase

There are eight thermal processes through which matter can attain phase change. They are melting, freezing, evaporation, condensation, sublimation, deposition, ionization, and recombination. These eight phases exist under different temperatures and pressure conditions.

What are the phase changes between states of matter?

• melting and freezing

• evaporation and condensation

• sublimation and deposition

• ionization and recombination

• all of the above

These processes: melting, freezing, evaporating, condensing, sublimation, and deposition are ​ (a)   and each transfers between phases differently.

• reversible
• irreversible

Melting: The transition from the ​ (a)   to the ​ (b)   phase.

• solid
• liquid

Freezing: The transition from the ​ (a)   phase to the ​ (b)   phase.

• liquid
• solid

Evaporating: The transition from the ​ (a)   phase to the ​ (b)   phase

• liquid
• gas

Condensing:The transition from the ​ (a)   phase to the ​ (b)   phase

• gas
• liquid

Sublimation: The transition from the ​ (a)   phase to the ​ (b)   phase.

• solid
• gas

Deposition: The transition from the ​ (a)   phase to the ​ (b)   phase.

• gas
• solid

Temperature can change the phase of a substance. One common example is putting water in a freezer to change it into ice. In the picture, we have a solid substance in a container. When we put it on a heat source, like a burner, ​ (a)   is transferred to the substance increasing the ​ (b)   of the molecules in the substance. The temperature increases until the substance reaches its ​ (c)   ^. As more and more heat is transferred beyond the melting point, the substance begins to melt and become a liquid^. This type of phase change is called an ​ (d)   because the pressure of the system stays at a constant level.

• heat
• kinetic energy
• melting point
• isobaric process
• temperature