Target Performances
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Lesson 4 – Investigating and Explaining Ethanol Burning (students as explainers) |
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Activity 4.1: Predictions about Ethanol Burning (30 min) |
Students develop hypotheses about how matter moves and changes and how energy changes when ethanol burns and make predictions about how they can use their investigation tools—digital balances and BTB—to detect movements and changes in matter. |
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Activity 4.2: Observing Ethanol Burning (30 min) |
Students record data about changes in mass and BTB when ethanol burns and reach consensus about patterns in their data. |
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Activity 4.3: Evidence-Based Arguments about Ethanol Burning (50 min) |
Students (a) use data from their investigations to develop evidence-based arguments about matter movements and matter changes when ethanol burns, and (b) identify unanswered questions about matter movement and matter change that the data are insufficient to address. |
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Activity 4.4: Molecular Models for Ethanol Burning (50 min) |
Students use molecular models to explain how carbon, oxygen, and hydrogen atoms are rearranged into new molecules during the oxidation of ethanol (the chemical change that happens when ethanol burns). |
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Activity 4.5: Explaining Ethanol Burning (40 min) |
Students explain how matter moves and changes and how energy changes when ethanol burns (connecting macroscopic observations with atomic-molecular models and using the principles of conservation of matter and energy). |
NGSS Performance Expectations
Middle School
- Structures and Properties of Matter. MS-PS1-1. Develop models to describe the atomic composition of simple molecules and extended structures.
- Chemical Reactions. MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
- Chemical Reactions. MS-PS1-5. Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
High School
- Chemical Reactions. HS-PS1-4. Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.
- Chemical Reactions. HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.