7 ways to use an egg in your science lessons

22 January 2015 In Blog Science
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As teachers we are always looking for resources to make our teaching experience memorable for our students. A chicken’s egg is a resource that is easily available and can be used in a number of different ways.

1. The raw chicken egg can be used to demonstrate carbon dioxide (CO2 ) gas formation in the class.  I asked my class to think about how to remove the egg shell without touching it? One of the students came up with the idea of putting it in vinegar. As we know, the egg shell is made of Calcium Carbonate (CaCO3 ) so when an egg is allowed to sit in the beaker of vinegar (acetic acid, CH3COOH), bubbles of CO2

started to rise from its surface. Observing the shell being dissolved in the vinegar was a great learning experience for the whole class. After a few hours the shell had completely dissolved in the vinegar and we were left with a pulpy egg having egg yolk and egg white enclosed in the thin egg membrane. Looking at the pulpy egg was really fun!

 

2. For helping the students get the basic understanding of the internal structure of the Earth I also used a boiled egg. The Internal structure of the Earth consists of 3 layers - the outer most layer is the crust, the middle one is the mantle and the inner most is the core. The boiled egg was cut in half. The egg shell, egg white, and egg yolk correlate to the three parts of Earth i.e., crust, mantle and core.

 

3. The structure of Atom consists of two main parts. In the centre we have the nucleus and the outer part consists of shell/ orbits in which electrons revolve continuously around the nucleus. The analogy of a fried egg was used to explain the structure of an atom - the yolk and egg white in the fried egg were related to the nucleus and shells respectively.

 

4. The fried egg also helped in teaching about the solar system.The sun is the center of the solar system and the planets revolve around the sun in fixed orbits. The egg yolk and egg white help to describe these parts clearly.

5. To explore density we used raw eggs. Since salty water is denser than plain water, if a raw egg is allowed to drop into the salty water it will float on the surface while it will sink in plain water.       

6. I also used a boiled egg and a raw egg to develop students’  observational skills. Students were presented with two eggs - a raw one and a boiled one. They were asked to differentiate between the two by using their observational skills. They touched, smelled, looked at them from different angles and tried to listen to the sound by shaking them. The boiled egg spun very smoothly on the table top while the raw one had a wobbly spin because of the different density of the liquid yolk and egg white. So due to the difference in their spins we can differentiate the two. 

7. I use a boiled egg to demonstrate the concept of air pressure. Take an empty plastic water bottle and place it in hot water. The hot air will rise and the bottle will partially empty. Now place a boiled egg (with white shell removed) on the mouth of this bottle and place the bottle in ice-cold water. The egg will rush into the bottle because the external air pressure is greater than the air pressure inside the bottle.

 

These activities made my science lessons fun for my students. 

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