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The compound of hydrogen and oxygen. Colourless, odourless liquid; heavier than water.
An exercise about the groups and structure of organic nitrogen compounds.
The devastating defeat of the Hungarians in the battle against the Mongolians was the result of several bad decisions.
A heterocyclic aromatic organic compound, its derivatives include guanine and adenine.
The simplest aromatic amine. Its scientific name is phenylamine.
Find notable locations of the Carpathian Basin on a map.
The Athenian democracy was built on the community of citizens with full rights.
Find present-day countries related to notable historical personalities.
The first paddle steamer in Hungary entered service in 1846.
An exercise about compound ions.
An exercise about different types of bonds.
An exercise about the polarity of molecules.
Colourless liquid that gives off smoke in moist air.
A solid, crystalline compound.
The Avars established a stable empire in the Carpathian Basin between the 6th-8th centuries.
A colourless liquid, a tertiary amide.
Place the sites of notable battles in history on a blank map.
Find historic landmarks on a blank map.
The Soviet army became a very powerful power broker after WWI, at first due to its size, later due to its arsenal.
Place the sites of notable battles in Hungarian history on a blank map.