Phosphoric acid (H₃PO₄)

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

Hungarian army in the 15th century (infantry)

One of the main units of Matthias Corvinus´ Black Army was the infantry.

Purine (C₅H₄N₄)

A heterocyclic aromatic organic compound, its derivatives include guanine and adenine.

Hungarian hussar

The term ´hussar´ refers to a type of light cavalry which originated in Hungary and was the most popular in the 18th–19th centuries.

Helicopter experiment (Oszkár Asboth, 1928)

As a milestone in the history of aviation, Oszkár Asboth´s first helicopter made its first flight in 1928.

Volume of spheres (demonstration)

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

Designing kitchen furniture - spatial coordinate system

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

Cuboid (exercises)

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


Pick the shape that is shown in different views below.

Net of a cube (exercises)

Not all nets consisting of 6 congruent squares are foldable into cubes.

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.

Aniline (C₆H₅NH₂)

The simplest aromatic amine. Its scientific name is phenylamine.

Pentane (C₅H₁₂)

The fifth member in the alkane homologous series. A colourless, combustible liquid.

Hydrogen-iodide (HI)

A colourless, heavier-than-air gas with a pungent odour.

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