We’ve had a busy week in First Class this week. We have been learning all about protein and how it is important for our growing bodies. We spoke about where protein comes from and why it is important in our diet. As part of our investigation, we decided to carry out the egg and vinegar experiment.
On Monday we put one raw egg into a full glass of water and we put another raw egg into a full glass of vinegar.
We made predictions about what would happen to the egg in 24 hours.
Some of our predictions were:
“The egg in vinegar will crack”, “The egg in vinegar will float”, “The egg in vinegar will sink”
We labelled the glasses and set them aside.
After leaving the egg for 24 hours we rechecked the egg to see if any of our predictions were correct. After the set time, we examined the egg and noticed that the egg in the vinegar had changed. There was a new bubbly substance in the glass forming at the top. Everyone got to feel the egg in the glass and we all noticed a difference. The egg was now smoother and some children remarked that it was spongy and foamy, not like a typical egg. We then set the egg aside for another 24 hours. The egg in the glass with the water was now at the bottom and no physical difference was noticeable.
Step 3- The fun part!
After leaving the egg to set for 48 hours it was now time to see what changes had come about. We took the egg out of the vinegar and washed off the foamy substance. We were left with an egg free shell, in a rubber sack. The children all felt the egg and remarked that it was similar to putty or a rubber ball. We had to remember to be very careful with the egg and make sure not to squish it too much in case we burst it.
Testing the egg:
We decided to test the egg by throwing it forcefully onto the grass at the front of our school. We all watched as the egg crashed to the ground and to our delight it exploded. We then examined the remains and the rubber sack had burst and the normal egg was now cracked on the grass.
We thoroughly enjoyed this experiment and working as scientists this week. We realised that while working as scientists we need lots of patience and we need to take records.
We can’t wait for the next experiment.