Daily Archives: January 15, 2017



Watch a solution change from pink to clear and back again with the hot and cold demonstration. (Ty Nigh)
Pink Color Change Chem Demo Here’s a fun chemistry demonstration that’s perfect for Valentine’s Day or to illustrate an oxidation-reduction reaction. The Vanishing Valentine involves shaking a solution, causing it to turn pink. If the pink Valentine solution is left undisturbed, it will become colorless. The color change cycle can […]

Vanishing Valentine Chemistry Demonstration





The green glow is emitted by phosphorus, atomic number 15, in the presence of oxygen, atomic number 8. Luc Viatour, Creative Commons License
Phosphorus is the element that is atomic number 15 on the periodic table. Phosphorus is an element that is essential for human life and found in many everyday products. Atomic Number 15 Element Facts The symbol for element 15 is P. The element was discovered by alchemist Hennig Brand who was […]

Atomic Number 15 Element Facts


Make a hollow penny by dissolving away the zinc to leave copper metal. (United States Mint)
This is an easy chemistry project that uses common materials. You take a post-1982 penny, score the copper surface to expose the zinc interior, react the zinc with acid, and are left with a hollow copper penny. Hollow Penny Materials post-1982 US pennies (metal composition changed in this year) muriatic […]

Hollow Penny Science Project