Photo credit: Henry McIntosh/Unsplash
This question has been the basis of many a year 10 SRP and has baffled scientists for years. The Mpemba effect, which is often cited as an explanation is really more of an observation. Now a number of teams have published work investigating the Mpemba effect. Read more here:
Molecular geometries follow regular patterns that can be worked out mathematically based the attractions between protons and electrons, the energy of electrons and the repulsion between electrons in the valence shell of atoms as this parody of Ed Sheeran’s “The Shape of You” explains.
It’s taken nine years of work, but it turns out it can be done. Scientist Jose Carlos Rubio, of Mexico’s University of San Nicolas de Hidalgo, has just patented his glow-in-the-dark cement. And what are its applications, other than looking very cool? Dr Rubio believes it could be a new way to light cities, streets and buildings without using electricity: the only thing emitted during its production is water vapour. It was a long process. Part of the challenge was cement’s opacity: the trick, he discovered, was to remove the crystal flakes that occur as a by product in one production method, which is done by changing the microstructure of the cement.
http://www.domain.com.au/news/mexican-scientist-invents-glowinthedark-cement-20160518-gox3bp/ for full article
How the Elements got their names:
The (OLD) Elements song:
The NEW Periodic Table Song:
There’s a chocolate prize for anyone who can sing either of the later two songs to a science teacher.
Thanks for the joke submission Zoe. This is an excellent use of cats – but don’t tell Mrs Jackson I said that!
Chemiluminescence is the technical term given when a chemical reaction gives off light!
In year 8 we study the ‘signs that a chemical reaction has taken place’. One of the signs that a chemical reaction has occurred is that it gives off energy – typically this energy is in the form of heat, but in a few cases the energy given off can be light! Different colours are made by different amounts of energy.
Check out these chemiluminescent reactions that our science club team recently experimented with:
Just in case it’s not obvious – don’t try this at home! See here for more details about why and the details behind how glow sticks work.
Sodium Polyacrylate mixed with water
Lithium on fire