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MS-PS1-7: Analyze and interpret data on properties of substances before and after substances interact to determine if a chemical reaction has occurred.

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By the end of this lesson, students will be able to:
- Define density as mass per unit volume
- Calculate density using the formula D=M/V
- Predict whether objects will sink or float based on density
- Compare densities of different materials through experimentation

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Essential Question: Why do some objects float while others sink?<br>Demonstration: Show students a heavy penny that sinks and a large piece of foam that floats.

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Introduction to density formula and concept:
- Define density
- Show relationship between mass and volume
- Demonstrate calculations
- Present real-world examples

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Guided Practice: Density Laboratory (15 min)

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Guided Practice: Density Laboratory (15 min)

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Students work in pairs using Padlet to document their findings:
1. Measure mass of different objects
2. Calculate volume using water displacement
3. Calculate density
4. Predict and test floating/sinking
Materials: Various objects, beakers, water, scale

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Students complete density problems independently and check answers with partners.

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Density Notes Density Pretest All About Density Mass, Volume and Density Notes MVD Lab MVD Conclusion Density Table Density Practice Page Movie Mythbusters - Ocean’s Eleven Lab Movie Mythbusters…

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For advanced students: Investigate how temperature affects the density of water using digital simulations.

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Why do some materials like wood float in water, and others don't? Interact with blocks of different materials, including a custom option by modifying their mass and volume, to explore the effect on the density and discover the conditions for sinking or floating in water.

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For struggling students: Use simplified density calculations with whole numbers and visual aids.

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During lab activity, circulate and check:
- Accurate measurements
- Proper use of formula
- Understanding of relationship between density and floating/sinking

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Students will create a collaborative Padlet wall showing objects they predict will sink or float, with explanations based on density calculations.

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Students solve one density problem and explain their reasoning in writing.

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Lead class discussion:
- What patterns did you notice about objects that float vs. sink?
- How does density help us understand everyday phenomena?

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Students write two things they learned about density and one question they still have.

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Find 3 examples of density in your home environment. Calculate the density of one object using measurements and explain why it floats or sinks in water.

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Complete interactive density problems using the PhET simulation.