Osmosis and "Naked" Eggs: The Environment Mattersby: Thomas O'Brien

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Osmosis is the diffusion of water through a selectively permeable membrane. Given their size and availability, the hard exterior shell of eggs provide a convenient macro-scale model of the system-level phenomenon of osmosis. Once the shell of a fresh, uncooked chicken egg is removed in an acid bath, the egg’s intact, selectively permeable cell membrane is elastic enough to noticeably swell and shrink without bursting in response to changing osmotic pressure. In this activity, students will see how the “Naked” egg-solution system demonstrates how constancy and change define biological systems. This free selection includes the Table of Contents, Introduction, a Science Education Topics section, and the Index.

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Reviews (3)
  • on Wed Jul 31, 2013 8:18 PM

My new goal is to be as reflective a teacher as the writer of this book. Excellent resource to have on hand when doing the classic egg osmosis experiment.

Emily Keeter  (Northbrook, IL)
Emily Keeter (Northbrook, IL)

  • on Mon Jun 20, 2011 4:29 PM

I wish I had this article before I did the original experiment with the kids. I understood what was going on with the egg, but the extensions are great, as well as the explanations. Our extensions were no where near as useful as those in the chapter, and the suggestions for teaching were absolutely awesome. Should be on every preservice teacher's bookshelf.

Jennifer Rahn  (Delafield, WI)
Jennifer Rahn (Delafield, WI)

  • on Sat Apr 23, 2011 3:15 PM

The author presents cogent reasons for educators using discrepant events as model science inquiry Even as it stands by itself, apart from the rest of the book, this chapter discusses great methods, offers insights into how science is learned, addresses misconceptions, outlines specific inquiry activities that may be incorporated at various levels from middle school through college and across content areas, presents rubric models, and correlates learning with cognitive readiness and science standards. The author is quite a wordsmith and his dialogue opens creative paths for the willing mind to follow and to absorb. The approach is warm, supportive, and encompasses all aspects of best practice. The thread highlighting communication and the importance of learners at all levels being encouraged to think about an observable phenomenon, to explain it and then to model an application as an extension of the thought processes creates dynamic energy within learning environments. This reader

Patricia  (Arlington, VA)
Patricia (Arlington, VA)

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