Hydrogen peroxide (H₂O₂)

The compound of hydrogen and oxygen. Colourless, odourless liquid; heavier than water.

2,2 dimethylpropane (C₅H₁₂)

Colourless, odourless gas used as a standard in NMR spectroscopy.

Acetaldehyde (ethanal) (CH₃CHO)

An aldehyde which is an important raw material and intermediate product in industry.

Nitrogen-dioxide (NO₂)

A reddish-brown toxic gas, very reactive due to its unpaired electron.

Hydrogen sulphide (H₂S)

A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in certain mineral waters and spring waters.

Historical topography (battles, Hungarian history)

Place the sites of notable battles in Hungarian history on a blank map.

Napoleon´s soldier (19th century)

Napoleon Bonaparte´s Grande Armée was considered invincible.

Lake steamer (1846)

The first paddle steamer in Hungary entered service in 1846.

Eurasian Avars (8th century)

The Avars established a stable empire in the Carpathian Basin between the 6th-8th centuries.

Phosphorus trichloride (PCl₃)

Colourless liquid that gives off smoke in moist air.

Soviet soldier (World War II)

The Soviet army became a very powerful power broker after WWI, at first due to its size, later due to its arsenal.

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