Over Easy: The Study Of Diffusion.

This photo shows you what is needed for this demonstration. (NOT SHOWN- A string and a metric ruler [millimeter scale]).

The next photos will show the steps-

1.)- After measuring the short and long circumferences, put the egg into the beaker (jar) and pour enough vinegar to cover the egg and cover the top of the beaker and leave in beaker for 24 hours. Notice how on the third picture the shell is bubbly-the vinegar is dissolving the shell. The shell is made up mostly of calcium carbonate (CaCO3). After 24 hours, the shell was completely gone. Egg was bouncy and slightly bigger. Egg was pale orange in color.

2.)- Gently rinse off the egg from vinegar and measure both long and short circumferences. Wash the jar with soap and water and gently place the egg back inside and add more vinegar if shell is not dissolved and return to beaker for another 24 hours. If shell is completely dissolved, pour enough corn syrup to cover the egg and leave in covered beaker for 24 hours. After 24 hours, the egg was very fragile and soft. It had a distorted shape and it was a deeper orange color.

3.)- Gently take out the egg from the jar and examine it. Gently rinse the egg and measure the two circumferences. Wash the beaker with soap and water and gently place the egg back inside the jar and pour enough distilled water to cover the egg and cover the jar. Wait another 24 hours. After 24 hours, the egg yolk was floating inside egg. Egg was large again and pale yellow in color.

DEMONSTRATION TOPICS

1.) QUESTION - What is being taught in this demonstration? What is being used for the things in the experiment to happen? You will be learning the process of osmosis and osmotic pressure that dramatically changes a cell. The things used are the vinegar, corn syrup, distilled water and the chicken egg.

2.) MATERIALS - Beaker (or jar), a small chicken egg, corn syrup, a cover for the beaker (or jar), a metric ruler (millimeter scale), a long enough piece of string, vinegar, and distilled water.

3.) SAFETY REGULATIONS - This experiment's materials are non-hazardous, but the normal lab precautions should be payed attention to and followed. Once the food and/or the materials are in use in the lab, they are now known as chemicals and are recommended not to be consumed. Safety glasses should be worn during this lab, and wash your hands thoroughly with soap and water before leaving this lab.

4.) PROCEDURE - ALWAYS WRITE DOWN YOUR OBSERVATIONS! Obtain the egg carefully. Use the string and ruler to measure both the long and short circumferences of the egg. Put the egg in the beaker and cover it with enough vinegar into the jar and cover the beaker to prevent evaporation; store for 24 hours. After 24 hours, gently remove the egg from the beaker. If the shell is completely dissolved, measure the circumferences and wash the jar with soap and water and place the egg inside it with enough corn syrup to cover it; if the shell is not completely dissolved, rinse the egg and wash the beaker, place the egg back inside and more vinegar to cover the egg. Always cover the beaker and store the beaker for another 24 hours. Handle the shell-less egg carefully and gently. After the 24 hours, carefully take out the egg, rinse it gently with water, and wash the beaker with soap and water. Measure the two circumferences. Put the egg back inside the beaker, and fill the beaker with the distilled water, enough to cover the egg, cover the beaker, and store the beaker for another 24 hours. After that 24 hours, remove the egg gently and carefully, and measure the short and long circumferences, and write down all of the observations found. Examine the results.

5.) DATA COLLECTION - There should be a table written out. If not, make your own table including egg with shell, egg with shell removed, egg in corn syrup, egg in distilled water, short circumference, long circumference, and other observations.

6.) CALCULATIONS - Yes, there will be some Math involved with this experiment/demonstration! This will deal with both circumferences and how they change throughout the experiment/demonstration.

7.) CONCLUSION - This experiment/demonstration is used to show the study of diffusion and how a cell is changed through dramatic changes caused by osmotic pressure (osmosis).

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