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Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.
Ammonium chloride is the result of the reaction of ammonia and hydrogen chloride
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
Formic acid is the simplest carboxylic acid.
The dissolution of zinc in hydrochloric acid produces hydrogen gas.
The solution of hydrogen chloride in water is called hydrochloric acid.
Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.
The medieval bell tower of the Cathedral of Pisa is the most famous leaning tower of the world.
The Chengdu J-20, also known as Mighty Dragon, is a multiple function stealth fighter aircraft.
The warship having several rows of oars was the typical warship of the Hellenistic era.
This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.
The marathon running event was instituted in commemoration of the run of a Greek soldier after the Battle of Marathon, fought between the Athenian and the...
One of the greatest archaeological finds of the 20th century was the tomb of the Egyptian pharaoh.
The animation offers a summary of the history of aviation from the Middle Ages.
The Greek fleet owed their success to their good tactics and their fast and easily manoeuvrable ships.
More than one million people died in the WWII Nazi death camp located in present-day Poland.
Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.
One of the largest marsupials.
The Earth's continents have been in constant motion during the history of the planet.
This animation demonstrates how an escalator works.