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Grades 6–8. In Unit 7.1 Chemical Reactions and Matter, Carolina Certified Version*, students work to answer the Unit Driving Question: "How can we make something new that was not there before?"
This unit on chemical reactions and matter transformations begins as students consider what happens to a bath bomb when it is added to water. They develop a model, at a scale smaller than they can see, to try to explain what they think happened to the matter that was in the bath bomb and what caused the gas bubbles to appear. This and related phenomena (where adding a solid to water resulted in gas bubbles appearing) lead to a broader set of students' questions around: How can we make something new that was not there before? Students analyze data about the bath bomb, including what happens to the amount of matter in the bath bomb and water before, during, and after gas bubbles appear; and the properties of the substances that make up the bath bomb, the water, and the gas that is produced. Students develop models to account for how new types of particles can appear from old particles. They compare their models to historical models developed by Dalton and other scientists, and they conduct investigations on water to determine if it has undergone a physical change or a chemical reaction. Finally, students revisit their initial models and explanations of the bath bomb to explain what substances could have been produced in the chemical reaction and why the mass of the matter in the system wouldn't change when this happens. They also conduct property tests that could be done to determine whether a particular substance was produced or not.
At two points during the unit, students apply what they have figured out about chemical reactions to explain related phenomena (Elephant's Toothpaste and the crumbling of the marble surface of the Taj Mahal).
Through these investigations, students:
This 5-Class Unit Kit includes basic teacher access to instructional materials on CarolinaScienceOnline.com, plus the materials needed to teach 5 classes of 32 students per day (160 students).
Building Toward NGSS Performance Expectations
Science and Engineering Practices
Focal Disciplinary Core Ideas
Focal Crosscutting Concepts:
*All enhancements to materials and instruction for this Carolina Certified Version of the unit are approved by OpenSciEd to preserve the integrity of the storyline and the instructional model.
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