The compound of hydrogen and oxygen. Colourless, odourless liquid; heavier than water.
Colourless, odourless gas used as a standard in NMR spectroscopy.
An aldehyde which is an important raw material and intermediate product in industry.
A reddish-brown toxic gas, very reactive due to its unpaired electron.
Pit houses were typical dwellings in the Arpad era.
A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in certain mineral waters and spring waters.
Place the sites of notable battles in Hungarian history on a blank map.
Find present-day countries related to notable historical personalities.
Napoleon Bonaparte´s Grande Armée was considered invincible.
The first paddle steamer in Hungary entered service in 1846.
An exercise about compound ions.
The Avars established a stable empire in the Carpathian Basin between the 6th-8th centuries.
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.
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.