Name: ___________________________________________
Bonewald/Schoepfer
Aim # 25: Review of Phases of Matter and Phase Changes
In this packet we will discuss three general states of matter: solid, liquid and gas. In each state of matter, there are many
molecules acting together. The motion and interactions of these molecules can largely be explained by considering the
intermolecular forces acting between them. Below is a summary of the shape, volume and strength of the
intermolecular forces in each state of matter.
Directions: Draw the particles of the 3 states of matter in the boxes on the left below
In the summary above, the phase changes between states of matter are also included. A phase change is when a
material changes from one state of matter to another. This does NOT rearrange the molecules of the substance, so we
call this a physical change, rather than a chemical change. For example, water vapor, liquid water and ice are all made of
H2O molecules. The only difference is how tightly packed those molecules are. Phase changes do require adding or
removing energy from the system.
Name: ___________________________________________
Bonewald/Schoepfer
Aim # 25: Review of Phases of Matter and Phase Changes
Directions: Create a Venn Diagram below to compare and contrast solids, liquids and gases. Try to fill in each bullet
point with a new idea. Use the summary on the front of this page to help you.
Explain the following phase changes in your own words:
1. Melting = ________________________________________________________________________________________________________________
2. Freezing = ________________________________________________________________________________________________________________
3. Evaporation = _____________________________________________________________________________________________________________
4. Condensation = ____________________________________________________________________________________________________________
5. Sublimation = _____________________________________________________________________________________________________________
6. Deposition = ______________________________________________________________________________________________________________
Look back to the first page of this packet and answer the following questions:
7. What is a phase change? __________________________________________________________________________________________________
8. Using water, give an example of a phase change: ______________________________--> ______________________
9. Do phase changes rearrange the molecules of a substance? _________________(yes or no)
10. A phase change requires __________________________________ or _____________________________ energy from a system.
Name: ___________________________________________
Bonewald/Schoepfer
Aim # 25: Review of Phases of Matter and Phase Changes
Identify the following phases/phase changes:
11. What phase is this substance in at point 1? ___________________________________
12. What phase is this substance in at point 3? ___________________________________
13. What phase is this substance in at point 5? ___________________________________
14. Which phase change occurs at point 2, when energy is added to the substance?
___________________________________
15. Which phase change occurs at point 2, when energy is removed from the substance?
___________________________________
16. Which phase change occurs at point 4, when energy is added to the substance?
___________________________________
17. Which phase change occurs at point 4, when energy is removed from the substance?
___________________________________
18. At what point does this substance begin to freeze? ___________________________________
19. At what point does this substance begin to melt? ___________________________________
20. At what point does this substance begin to boil? ___________________________________
21. At what point does this substance begin to condense? ___________________________________
22. In what part of the curve would substance X have a definite shape and definite volume?
___________________________________
23. In what part of the curve would substance X have a definite volume but no definite shape?
___________________________________
24. In what part of the curve would substance X have no definite shape or volume?
___________________________________
25. Describe what occurs to the temperature of a substance during a phase change.
_________________________________________________________________________________________________
Name: ___________________________________________
Aim # 25: Review of Phases of Matter and Phase Changes
Bonewald/Schoepfer