When your mom tells you to chew your food, you really should listen! A lesson on the digestive system examines the first step of digestion that happens in the mouth. Learners check crackers and use iodine to highlight changes in the composition of the cracker. 

Concepts

the digestive system, mouths, mechanical energy, chemical energy, physical changes, chemical changes

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Additional Tags

science

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Instructional Ideas

• Use multiple options for food to compare the result with different textures

Classroom Considerations

• Requires a specific set of materials and time for set up
• Meant as an introduction to the digestive system
• The lesson is the 11th in a larger series on the transport systems of the body
  

Pros

• Includes an answer key with sample solutions
• Provides an option for extending the lesson

Cons

• None