In this engaging lesson, students draw simple conceptual models that explain what happens to water molecules as water is heated. Then, students collect data by observing what happens to blue and yellow food coloring as it is dripped into a beaker of cold water and a beaker of hot water. Students revise their models and learn that the speed and density of water molecules change as heat is added and removed.
It is a great inquiry-based lesson that leads into solids, liquids, and gases as well! It can be used as a single lesson or created into a unit with other resources that provide students with more evidence to evaluate their initial models. This lesson also includes a teacher prep, conclusion questions, and an answer key!
It aligns with the following NGSS Next Generation Science Standards Performance Expectation:
MS-PS1-4. Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure
substance when thermal energy is added or removed
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