What would a periodic table made of postage stamps look like? Well, Larry French from St Lawrence University, Canton, New York has taken on this challenge to produce this Philatelic Table of Elements. It was first presented at the spring 2016 American Chemical Society Meeting to mark the International Year of the Periodic Table (IYPT 2019).
In the previous parts of this series, we presented an overview of what nanoparticles are and what they can do. We emphasized the importance of surface atoms as the only ones that can facilitate catalytic reactions.
In Part 1 of this series we described nanoparticles, what they are, how they are made and how they compare to other forms of metal. We also described how metal surfaces serve as catalysts facilitating reactions such as the hydrogenation of an alkene.
As a science teacher, if you were asked for an example of a catalyst, your car’s catalytic converter may come to mind. Most informed citizens would do the same. What may come as a surprise is that catalytic converters have dramatically changed in the past decade and now use only a small fraction of the precious metals that older models used.
I co-instruct and coordinate an undergraduate materials and nanoscience (MNS) lab at the University of Waterloo. One experiment in 2nd year consistently stands out as my students’ favourite, and it involves the synthesis and characterization of “capped” cadmium selenide (CdSe) “quantum dots” (QDs).
In the December 2016/January 2017 issue of Chem 13 News, I explored the regulation of active ingredient content in pharmaceutical tablets. Recently, purchasing a bottle of Jamieson 400 IU1 (10 g) Vitamin D tablets, I was surprised to see “Improved Smaller Tablets” boldly printed on the label in a blue rosette.1 Why make the small tablets even smaller?
The Merriam-Webster dictionary defines photochromic(1) as: “capable of changing color on exposure to radiant energy (as light), e.g., photochromic glass”. Photochromic eyeglass lenses were introduced in 1966, and photochromic plastic lenses....
Those who take a daily, low-dose, 81-mg ASA tablet (acetylsalicylic acid) and other pharmaceuticals may be familiar with a small polymer canister in each tablet bottle (Photos right and below). A canister from an Aspirin bottle is shown. Aspirin® is a trademark in Canada, but a generic term for ASA in the US.
Solid phase microextraction (SPME) is a fast, environmentally friendly, field-compatible method of sample preparation for chemical analysis. In 2001, Chem 13 News published an introductory article about the newly developed technique, and since then its popularity has grown, expanding to scientists in many disciplines.
This is the 10th article in the series, which considers some common organic molecules encountered in our everyday lives. Described will be some general chemical information about the organic molecule, how it is useful to us, and other interesting facts.
It was interesting to read a recent “pet peeve” from Darrel Beach about skeletal organic formulae. For many years he has required his students to explicitly show all four bonds from each carbon atom in every organic molecule they drew.
Doping is in the news again due to the Lance Armstrong scandal. However, the use of performance enhancing drugs is nothing new. Philostratus “The Athenian” warned about doctors helping the athletes in ancient Greece by cooking bread with opium derivatives from the poppy plant.
By the 21st Century, one would think that the chemistry of common inorganic compounds would be firmly established. Not necessarily so! A good example is the existence — or non-existence — of lithium hydrogen carbonate.
Recently, Russ George, an American businessman, performed what many believe to be a questionable experiment. Mr. George “fertilized” the ocean by dumping 100 tonnes of an iron-enriched, dirt-like material into the Pacific, several hundred kilometers off the coast of northern British Columbia.
In July 2012, the 44th International Chemistry Olympiad (IChO) was held in Washington DC. The competition included both practical and written examinations and had 280 students representing 72 countries worldwide.
Sometimes errors appear in textbooks and are propagated like memes. It is unfortunately common for textbook writers to assume that previous texts are correct and that the facts no longer need to be checked. In the case of the combustion of magnesium ribbon in air, the “fact” that a mixture of magnesium oxide and magnesium nitride is formed has become “common knowledge” and appears never to be questioned.