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1. Dissolving the Shell off an Egg
You will need a few items that are not in the Starter Kit:
- An egg, uncooked.
- About a cupful of vinegar.
- A glass jar (an empty jam jar will do) large enough to hold the egg and the vinegar.
Place the egg in the jar and pour in enough vinegar to cover it completely.
Leave it in a safe place, uncovered. The process takes a few days. Examine the egg each day and record what you see:
- Do you see bubbles forming on the egg or floating up to the top?
- Does the shell appear to change in colour?
- Do you see any other changes in the egg?
You will also need to refresh the vinegar in the jar every second day. Just pour out the vinegar carefully without damaging the egg and pour in some fresh vinegar.
If all goes well, in a few days, you will see that the egg has changed colour. The shell has disappeared leaving the slightly transparent inner membrane intact! You should be able to see the yolk inside it too.
The Egg reacting with the Vinegar
2. A Bouncy Egg
This experiment is similar to the first one, but you need a boiled egg rather than an uncooked one.
You will need:
- A boiled egg with the shell intact. (Please get the help of an adult for this)
- A glass jar
- Some vinegar
Now place the egg in the jar and pour the vinegar over it as before.
Keep the jar in a safe place and observe daily, changing the vinegar every second day.
Note down what you see. The process will take about one week to complete.
At the end of a week, you should see that the shell has dissolved and that the egg seems to have grown bigger. Take the egg out of the jar and carefully dry it with a paper towel.
You will notice that it feels different to a normal boiled egg. It should have a more flexible "bouncy" feel.
Try dropping it on a hard surface, like a dinner plate, from a height of about 20-30 Cm (not more, or it will split - it is not that strong!). Note down what you see.
Now try comparing it with a freshly boiled egg that has been shelled. You can even try dropping both from the same height to compare how they behave.
3. Spinning Egg
In this experiment you will be able to identify which egg is hard boil compered to raw egg without cracking them.
Materials required:
A raw egg
A hard-boiled egg
A smooth table top
Marker pen
Protocol:
1. Label the hard-boiled egg with a H. Label the raw egg with a R.
2. Spin raw egg on the table top.
3. Spin hard-boiled egg on the table top.
4. Observe which egg spins fastest and longest and record.
5. Spin both eggs again on the table top.
6. Try to stop them by putting your finger on them lightly.
7. Observe which egg stops easily and record.
What Happened
The hard-boiled egg should spin longer and easy to start spinning and easy to stop spinning as hard-boiled eggs are solid inside. When you try to stop the raw egg, it keeps spinning as the liquid inside the raw egg, still slides because it is liquid. When you try to stop raw egg it only stopped the shell, but the liquid inside which causes the shell to keep spinning.
A hardboiled egg is solid inside whereas a raw egg is liquid. When you spin the raw egg, its centre of gravity changes as the liquid inside the egg moves around, resulting in the vibrant motion in the raw egg. When raw egg starts spinning, you can stop it briefly with your finger however when you take your finger away quickly, the egg will continue to spin for a second. This is due to the continuous motions of the liquid inside the egg are still moving. When the hardboiled egg is spun, the solid centre immediately moves with the shell together and when you stop it with your finger shell and hard material inside the egg stopped together.
3. Spinning Eggs
This is a simple experiment that can help you distinguish a raw egg from a boiled one, without cracking them!
You need a boiled egg and a raw egg.
(Please get an adult to help you boil the egg)
- Using a marker pen, mark the shell of each egg so that you know which one is boiled and which is raw.
- Now place them both on a hard, flat surface.
- Spin each of them in turn, using the same amount of effort. Let them spin and come to a stop naturally. Record the time each one takes.
- Which one stopped earlier? Was one of them easier to spin than the other? Which one?
- Now spin them again.
- While they are still spinning, apply a little pressure with your finger to slow them down to a stop. Then let go.
- Was one of them easier to stop than the other? Which one? Did you see anything else?
- Try the experiment a few times until you get consistent results and then compare them.