A red hot ball of nickel is dropped in a cup of water, resulting in a most unexpected reaction, in this demonstration of the Leidenfrost effect by Carsandwater.

via Laughing Squid.

This experiment was featured a few months ago in a video that had a variety of DIY science tricks. But it’s such a fun and easy activity to do that it bears repeating: Get some milk, dish soap, food coloring, a plate, and then wait for the oooos, aaahs and whoaaaas.

Thanks, currentfrequency.

Now this is an effective way for co-curators to remember the names of elements… have the elements explode! Five out of the six Alkali metals react with air and water: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), and Caesium (Cs). 

Via laboiteverte.fr.

(NH₄)₂Cr₂O₇! Or… an Ammonium Dichromate Volcano!

With some heat, these (highly toxic) orange crystals will thermally decompose as they release heat, nitrogen, water and green dichromium (III) oxide ash. 

Via laboiteverte.fr.