Cubs place eggs into jars filled with vinegar. Leave for a week and watch them turn into rubber eggs and then shrivel when placed in Cola!
Eggs; empty jam jars with lids; clear plastic beakers or food containers; spirit vinegar or malt vinegar; water; a bottle of cola
1. Carefully place the eggs in jars. Fill the jars with vinegar and put the lids on.
2. Little bubbles should start to form on the egg-shells. This means that a chemical reaction has begun. Leave the eggs until your next meeting.
3. Check on your eggs. The egg-shells will have completely dissolved, leaving behind squishy "rubber eggs".
4. Remove the eggs and carefully rinse them in water. Compare their size to a normal egg - are they bigger? What do they look and feel like?
5. See how strong the membranes are by squeezing some of the eggs until they burst; do this over a bucket or plastic sheet. Careful, it will be messy! Remember to save some eggs for the next step.
6. Put one of your eggs in a jar of water and another in a jar of cola. The egg in water will swell as it absorbs water through the membrane, while the egg in cola will shrivel as water leaves the egg. If you put the wrinkly egg in a new jar of water, it will swell up again.