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Eggs and Osmosis

•What was the point of this activity?

To introduce students to diffusion and osmosis. Allow students to have a better understanding of how diffusion and osmosis occurs.

Explain how you would introduce this to your class?

First, I will ask the students to predict what will happen to the egg while it sits in the vinegar and what will happen if it’s placed in syrup? Second, as a class, we will place the egg in vinegar for a week and make observations. Next, add the egg into syrup and make observations. Discuss why each egg reacts differently to certain substances.

•Where do you see a student having difficulty with this?

Understanding why the egg will react a certain way to different liquids/substances.

•What changes or extensions could you do to this activity?

Place the yoke in water to see what happens after it was placed in syrup for a week-Add dye to the water to see if water went inside the egg.

Scientific Principles:

As the egg is placed into the vinegar, the vinegar’s acetic acid reacts to the calcium from the eggshell. The acid breaks down the eggshell to produce carbon dioxide, calcium, and water. Once the shell has broken down by the vinegar, bubbles of carbon dioxide are formed on top of the egg and released to the surface. Syrup comes from a high concentration of dissolved sugar molecules. The molecules are too big to pass through the semipermeable membrane of the egg. Water molecules pass through the membrane out into the syrup until each side has the same water molecules. The movement to the molecules results to a shrunken egg. After the egg is placed back into the water, the egg grew because the concentration of water molecules in the egg is higher than Syrup.  The water molecules are moving into the egg, instead of out of the egg. Since the increase of water occurs, the egg expands.

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