Osmosis Lab—Investigating Osmosis and Diffusion Using Deshelled Eggs.

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Supporting document included
This is an additional download that supports the video.
How do substances move in and out of cells? Can any substance enter a cell or are some prevented from doing so? What happens when a cell loses or gains a significant amount of water? This lab uses deshelled eggs to investigate how water can enter and exit across their membranes. The idea of a control is introduced.

The video has two parts, the first is directed towards the learner and shows the experiment being performed. In the second section, Teacher to Teacher, I discuss some background info as well as hints and helps. Written instructions are designed to go straight into students hands so you can literally print and go— writing prompts help focus student writing and lab sheets are available for students who need more structure and support. Answer Keys and Teacher Notes are there to address most questions and issues that might arise in this study—you shouldn’t have to do outside research unless you want to. The video and the written materials are intended to support each other, but each is designed to work independently—if it’s easier to use the video, do that… if you prefer to skim a written instruction and get started more quickly, do that—if you prefer to use both, do that. It’s completely up to you.

Concepts Addressed
• Osmosis is the movement of water through semipermeable membrane from a less concentrated solution to a higher one.
• Not every substance can cross a partially permeable membrane.
• When there is net flow of water into or out of a cell, its turgor pressure changes.
• Water and other substances, get into and out of cells through osmosis and diffusion.

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

Materials Needed
eggs, vinegar, sugar or corn syrup, scale,

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 requires some advanced prep and a day or more of observation.

Student Sheets
• Scaffolded writing prompts & lab reporting

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Click here to visit my website to find out about teaching ideas and resources.
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