Ancient Roman senator with his wife

Senators, being members of the highest social class of ancient Rome, wore togas with...

Phosphoric acid (H₃PO₄)

It is also used as a food additive, limescale and rust remover.

Molecule exercise VII (Organic nitrogen compounds)

An exercise about the groups and structure of organic nitrogen compounds.

Hydrogen sulphide (H₂S)

A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in...

Nitrogen-dioxide (NO₂)

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

Aniline (C₆H₅NH₂)

The simplest aromatic amine. Its scientific name is phenylamine.

Ozone (O₃)

An allotrope of oxygen, consisting of 3 oxygen atoms.

2-deoxy-beta-D-ribose (C₅H₁₀O₄)

A component of DNA, it contains one less hydroxyl group than β-D-ribose.

Hexane (C₆H₁₄)

The sixth member in the homologous series of straight-chain alkanes.

Sulphur trioxide (SO₃)

One of the oxides of sulphur, forms sulphuric acid with water.

Hydrogen bromide (HBr)

One of the hydrogen halides, it is used for the production of alkyl bromides.

Historical topography (notable personalities, universal history)

Find present-day countries related to notable historical personalities.

Ancient Athenian citizen with his wife

The Athenian democracy was built on the community of citizens with full rights.

Cuboid (exercises)

Edges, diagonals and faces of a cuboid can be identified by its vertices.

Volume of spheres (demonstration)

The sum of the volume of the ´tetrahedrons´ gives an approximation of the volume of the...

Designing kitchen furniture - spatial coordinate system

Practising the use of the spatial coordinate system with the help of a computer-designed...

Lake steamer (1846)

The first paddle steamer in Hungary entered service in 1846.

Views

Pick the shape that is shown in different views below.

Pent-1-ene (C₅H₁₀)

A liquid with a characteristic unpleasant odour and a low boiling point.

Ethyne (acetylene) (C₂H₂)

The first member of the homologous series of alkyne hydrocarbons.

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