Diffusion Lab—Molecular Motion and Change of State Video & Written Instruction

Supporting document included
This is an additional download that supports the video.
In this activity, students build a model to show molecular movement in solids, liquids, and gases and can use these models to show change of state such as melting, freezing, and evaporation. Using simple materials such as plastic pellets and plastic cups, students can design a series of models. By gaining an understanding of molecular motion, students will better understand diffusion and osmosis as well as how substances get into and out of cells.

By starting with the scientific phenomena, you'll be intrigued and excited to dig deeper into the why’s and how’s of each scientific concept. Beautifully illustrated and well laid out, these lab activities are easy to use from the very first page. Experiments are clearly organized and written to the student so they do not need to be pre-digested by a teacher before beginning. Helpful tips throughout the experiments and the Teacher Notes leave the reader in no doubt about how to perform or understand an experiment. Designed for students and optimized for teachers, these labs will engage and fascinate students. Scaffolded writing prompts allow students of different abilities to engage with the same content. Both the teacher and the student are addressed so no additional books are needed. Engaging Science Labs are useful for classroom or homeschool environments.

Concepts Addressed
• Molecules are always in motion, even in the solid state.
• Solids, liquids, and gases have distinct molecular organization.
• When materials change from one state to another, their molecules move in a characteristic way.

Click here to see companion curricular pieces:
Diffusion Lab—Investigating Diffusion at different temps—Video & Written Instr
Osmosis Lab—Investigating Diffusion and Osmosis w/ Potatoes—Video & Written Inst
Diffusion Game—Molecular Motion & Change of State—Video & Written Inst.
Osmosis Lab—Investigating Osmosis and Diffusion using deshelled eggs

Materials Needed
Plastic cups (or pie pans, or Petri dishes), plastic pellets or BBs

Answer Key
Extensive teacher notes address the many questions that come up. You shouldn’t have to do outside research on this topic unless you want to.

Time Required
This lab takes about 30 mins, but with extensions can take longer.

Student Sheets
• Scaffolded writing prompts & lab reporting


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