The Incredible Egg http://www



The Incredible Egg

Modified based on information retrieved from

What You Need:

|Two raw eggs (in shell) |Permanent marker |Lamp (light source) |

|Bowl |Plate or Petri dish |Paper towel |

|Rubbing alcohol |Paper and pencil |Magnifying glass, optional |

|Balance |Pan |Water (for boiling egg) |

What's really inside an egg?

1. First, observe, or look at, the egg. Find the mass of both eggs. Mark one egg with a “B”. Hold each egg in front of the light source. Write down what you notice about the eggs using words to describe it.

|Data |

|Mass of egg (raw) |A: |B: |Mass of egg (boiled, B) |

|Description of egg (raw) |

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|Description of egg (while being heated) |

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|Description of egg (cracked) |

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|Description of egg (boiled) |

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2. Place the egg marked “B” in a pan of water and heat to boiling for about 10-minutes. After approximately 5 minutes, observe the egg in the heating water. Record your observations in the data table above.

3. Carefully crack the raw egg onto the plate. Put the shell in the bowl. Clean up any liquid that may have spilled with alcohol and paper towel.

4. Look at the inside of the shell. Record any interesting observations about the inside and the outside of the shell in the data table above.

5. Now, look at the egg in the bowl. Draw a picture of what you see in the circle below.

6. Identify and label the following parts of the egg: membrane, albumen, yolk,

[pic]

7. After the “B” egg has been boiled, allow it to cool under cold running water. Dry the boiled egg and find the mass of the boiled egg. Record the mass in the data table.

8. Remove the boiled egg from the shell, allow it to cool under cold running water. Dry the boiled egg and find the mass. Record the mass in the data table.

9. Crack the shell of the boiled egg and remove the egg. Cut it in half and make observations. Draw a picture of what you see in the circle below.

10. Explain your findings in the conclusions chart below. Account for any interesting observations you made during the experiment and describe at least two differences between the raw and boiled egg.

A Scientific Explanation

The yolk and albumen both serve as food for the young chick while it develops in the egg. A chick will only grow in a fertilized egg. Eggs that you buy at the grocery store are unfertilized and do not have baby chicks inside them.

|Conclusions |

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Raw egg field of view

Boiled egg field of view

Word bank: parts of an egg

membrane - this is the thin film inside the shell. It allows air to enter the shell but keeps the liquid safe inside.

albumen - this is the slimy clear liquid. It is the white part of a cooked egg.

yolk - This is the center yellow part of an egg. Look for the strings that keep the yolk fastened in the center, these strings are called chalaza(e).

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