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Lessons for 7th grade2 / 5
All 7th grade lessons

Osmosis

Why?

Osmosis is the movement of water across a membrane from a dilute solution to a more concentrated one.

A potato chip in salty water loses water and goes floppy, while one in pure water takes in water and becomes firm.

Press the button to put potato chips in salty and pure water.

Drag the picture to look around.

A red blood cell placed in pure water swells until it bursts, but in very salty water it shrivels up.

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