Interesting experiment 1: Eggs in a bottle;
Soak the eggs in 10% acetic acid. When the eggshell becomes soft, take out the egg, find a jar with a slightly smaller bottle mouth than the egg, put a burning alcohol cotton ball into the jar, and when the flame goes out, quickly aim the small head of the egg at the mouth of the jar, and the egg is quickly sucked into the jar.
Interesting experiment 2: eggshell description;
Take a red-shelled egg (the shell of the red-shelled egg is slightly hard), wash it and gently dry it with a cloth. Take 10 g~20 g wax, heat and melt it, dip it in wax liquid with a brush, and draw or write on the eggshell. After the white wax condenses, slowly immerse the egg in 10% acetic acid, and stir the egg with chopsticks to make it contact with the solution evenly for about 20~30 minutes.
When there are many bubbles on the surface of the eggshell, it shows that there is obvious corrosion on the eggshell. Take out the eggs, rinse them with clear water and dry them. Punch a hole in each end of the egg with a nail and blow out the egg white and yolk with your mouth.
Interesting chemistry experiment in high school: leaving traces of protein;
Take an egg, wash the oil on the surface and dry it. Dip the brush in acetic acid and write on the eggshell. After the acetic acid volatilizes, cook the egg with dilute copper sulfate solution, and peel off the eggshell after the egg cools, leaving clear blue or purple handwriting on the egg white, but leaving no trace on the eggshell.
This is because acetic acid can dissolve a small amount of protein after dissolving eggshells. Egg white is a globulin composed of amino acids, which hydrolyzes under weak acidic conditions to produce peptides and other substances, and the peptide bonds in these substances are complexed with Cu2+ and appear blue or purple.