Trans-2-butene (C₄H₈)

A colourless, heavier-than-air gas. Its geometric isomer is cis-2-butene.

Sulphate ion (SO₄²⁻)

A compound ion produced when sulphuric acid releases protons.

Designing kitchen furniture - spatial coordinate system

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

Ichthyosaur

Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.

2-deoxy-beta-D-ribose (C₅H₁₀O₄)

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

Helicopter experiment (Oszkár Asboth, 1928)

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

Chloromethane (methyl-chloride) (CH₃Cl)

Chloromethane can be prepared by heating a mixture of methane and chlorine.

Imidazole (C₃H₄N₂)

A biologically and practically important organic compound.

Ammonium ion (NH₄⁺)

A compound ion generated when a proton is added to an ammonia molecule.

Bromine (Br₂)

One of the halogens, it may cause skin irritation.

Propane (C₃H₈)

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

Eurasian Avars (8th century)

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

Cyclohexane (C₆H₁₂)

A colourless liquid, easily solved by organic solvents but not by water.

Beta-D-ribose (C₅H₁₀O₅)

A crystalline compound found in nucleic acids, coenzymes, nucleotides and nucleosides.

Fluorine (F₂)

The lightest halogen, a pale yellow-green, toxic gas, extremely reactive. Its best known compound is teflon.

Lake steamer (1846)

The first paddle steamer in Hungary entered service in 1846.

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