We are loving Evan's 9th grade Apologia Biology course!
Yes, it's HARD and yes, he has a TON of very difficult
vocabulary words & concepts to learn.
But the experiments are AMAZING!
He finished his experiment on OSMOSIS this week, and it was so
fascinating that I have to share his summary report with you!
We
put an egg inside of a mug filled with vinegar for 24 hours. That made the shell of the egg come off.
After
the 24 hours, we took it out of the mug, and put it inside of a mug filled with
Karo syrup.
It
made the egg sink in because the syrup drew out the water portion of the egg
white material.
This process of particles passing through a semi-permeable membrane is called OSMOSIS.
After
soaking the egg in Karo Syrup for 24 hours, we placed the egg into a mug filled
with distilled water.
This
made the egg swell back up! It filled
the egg with water through osmosis again!
It
actually made the egg expand 14% larger than its original size. (The green ribbon was the length of the original circumference of the egg! It gained some weight!)
The original circumference of the egg was
14.5 cm and the circumference of the egg after the distilled water was 16.5 cm.
It felt like a water balloon! (So he just had to throw it to see what was inside!)
This experiment taught us the principle of osmosis!
