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Main Curriculum Tie:
Background For Teachers:
Student Prior Knowledge:
Intended Learning Outcomes:
Use a picture of the human digestive system (see websites listed in Background for Teachers) to explain that the digestive system consists of the parts of the body that change the food we eat. It is in this changed state that food can be used by the different body cells in our bodies.
STEP TWO: THE EXPERIMENT
Explain to the students that many foods we eat interact with one another in our digestive system; namely, our stomachs. Ask if anyone has ever experienced a stomach ache from eating certain foods.
Divide the class into groups of four. Assign each group member one of the following roles:
Ask those students in charge of materials to collect the supplies for their group. Although none of the materials are toxic, goggles and rubber gloves are recommended, not only to emphasize the serious nature of an experiment, but to protect against harm from any accidental splashing.
Do the experiment with the class so that they can follow the steps accurately. Explain that the jar represents the human stomach.
Ask what the students had to eat for breakfast. When someone mentions milk, ask the groups to add 1 tablespoon of milk to the jar.
Further the story by telling the students that some people would eat a salad for lunch. Ask for a raise of hands of those who would eat a salad at lunch time. Commend the students for eating vegetables. Continue by stating that some people eat their salad with a vinegar and oil dressing. Ask the students to predict what they think will happen to the milk if they added vinegar to it. Have the students add 1 tablespoon of vinegar. The students will observe the changes to the milk. There is no need to stir the mixture.
The food story continues later that afternoon as you begin to get hungry again. After school your grandfather greets you at the door. He tells you that he has just made his best baking soda biscuits and offers you one. You gladly take one. Ask the students to predict what will happen to the solution in the jar if they add baking soda. Have the students add 1 teaspoon of baking soda to the solution and observe the changes.
Ask the students to quickly think of a way to solve the problem of this gaseous feeling their stomachs may be experiencing at this time. Someone will probably think of a liquid antacid. Ask the group why they think liquid antacid would help. Have the materials people add a tablespoon of liquid antacid to the mixture and observe the changes.
STEP THREE: CONCLUSION
Have the small groups discuss the experiment. Then have the reporters take turns sharing with the class the findings of their experiment. Have the class make a science journal entry describing the findings of their experiment.
Strategies For Diverse Learners:
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