A colourless, heavier-than-air gas. Its geometric isomer is cis-2-butene.
A compound ion produced when sulphuric acid releases protons.
Practising the use of the spatial coordinate system with the help of a computer-designed kitchen model.
The simplest dicarboxylic acid.
Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.
A component of DNA, it contains one less hydroxyl group than β-D-ribose.
The monomer of PVC.
As a milestone in the history of aviation, Oszkár Asboth´s first helicopter made its first flight in 1928.
Chloromethane can be prepared by heating a mixture of methane and chlorine.
A biologically and practically important organic compound.
Pit houses were typical dwellings in the Arpad era.
The simplest aldehyde.
A compound ion generated when a proton is added to an ammonia molecule.
One of the halogens, it may cause skin irritation.
The third member in the homologous series of straight-chain alkanes.
The Avars established a stable empire in the Carpathian Basin between the 6th-8th centuries.
A colourless liquid, easily solved by organic solvents but not by water.
A crystalline compound found in nucleic acids, coenzymes, nucleotides and nucleosides.
The lightest halogen, a pale yellow-green, toxic gas, extremely reactive. Its best known compound is teflon.
The first paddle steamer in Hungary entered service in 1846.