CK-12 Physical Science Concepts - For Middle School

http://www.ck12.org Chapter 2. Matter

• molecule: Smallest particle of a compound that still has the compound’s properties.

Explore More

Investigate compounds at the following URL. Be sure to view the rotating 3-D models of molecules and crystals.
Then answer the questions below.

http://www.edinformatics.com/math_science/compounds_molecules.htm

1. What are ionic compounds?


2. What types of elements form ionic compounds? Give an example of an ionic compound.


3. What are covalent compounds?


4. What types of elements form covalent compounds? Give an example of a covalent compound.

Review

1. What are compounds? List three examples.


2. How do the properties of compounds compare with the properties of the elements that form them?


3. Compare and contrast crystals and molecules.