Ethyne (acetylene) (C₂H₂)

The first member of the homologous series of alkyne hydrocarbons.

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.

Phosphoric acid (H₃PO₄)

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

Aniline (C₆H₅NH₂)

The simplest aromatic amine. Its scientific name is phenylamine.

Hydrogen bromide (HBr)

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

Sulphur trioxide (SO₃)

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

Hexane (C₆H₁₄)

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

2-deoxy-beta-D-ribose (C₅H₁₀O₄)

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

Molecule exercise V (Oxo compounds)

An exercise about the groups and structure of oxo compounds.

Life on the farm (Hungary)

Farming consists of special agricultural activities.

Clothing (Western Europe, 14th century)

Clothing reflects the lifestyle and culture of the region's inhabitants.

Ammonium ion (NH₄⁺)

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

Genome editing

Genome editing is a type of genetic engineering which results in changes in the genome of an organism. This animation presents one of the best-known genome...

Imidazole (C₃H₄N₂)

A biologically and practically important organic compound.

Clothing (Western Europe, 16th century)

Clothing reflects the lifestyle and culture of the region's inhabitants.

Chloromethane (methyl-chloride) (CH₃Cl)

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

Clothing (Western Europe, 18th century)

Clothing reflects the lifestyle and culture of the region's inhabitants.

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