NOTE TO TEACHERS: 
These procedures are written to show you how you might use these technologies to teach science concepts. Suggested questions, approaches, and expected answers are all provided. Therefore, these activity descriptions should be used as a guide for your instructional planning, rather than as step-by-step directions for students.

Chemists study many thousands of natural substances from the earth's crust, the atmosphere, and the oceans, as well as synthetic substances produced in their laboratories. In order to simplify the task of learning about all of these different materials, scientists have developed classification schemes.

How can different kinds of matter be classified to help scientists learn about their properties?

What are the relationships between the categories and types of matter in the world?

How are compounds, elements, mixtures, and pure substances related to each other?

In this activity you will create a concept map that diagrams the relationships among the following ideas:

• Air

• Carbon

• Chocolate chip cookie

• Compound

• Element,

• Heterogeneous

• Homogeneous

• Mixture

• Oxygen

• Pure

• Salt water

• Sodium chloride

• Soil

• Solution

• Water