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Hydrogen sulphide (H₂S)

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

Ethane (C₂H₆)

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

Nitrogen-dioxide (NO₂)

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

Ethyne (acetylene) (C₂H₂)

The first member of the homologous series of alkyne hydrocarbons.

Cis-2-butene (C₄H₈)

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

Silver nitrate (AgNO₃)

One of the raw materials of traditional photography.

Phosphate ion (PO₄³⁻)

A compound ion formed when a phosphoric acid molecule releases a proton.

Pent-1-ene (C₅H₁₀)

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

Propane (C₃H₈)

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

2,2 dimethylpropane (C₅H₁₂)

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

Ethene (ethylene) (C₂H₄)

The first member in the homologous series of 1-alkenes.

Glycylglycine (C₄H₈N₂O₃)

The simplest peptide, formed from two glycine molecules by a peptide bond.

Dimethylamine (NH(CH₃)₂)

A colourless gas with a pungent odour. It is widely used in industry.

Glycerol (propane-1,2,3-triol) (C₃H₈O₃)

A triol that is often used as an ingredient of creams and ointments.

Ethanol (ethyl alcohol) (C₂H₅OH)

The best known alcohol, important in the food industry.

Hydrogen peroxide (H₂O₂)

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

Pyridine (C₅H₅N)

A basic heterocyclic organic compound; a colourless, pungent toxic liquid.

Boron trifluoride (BF₃)

Colourless, heavier-than-air gas with a pungent odour. It forms white fumes in moist air.

Leonardo da Vinci’s inventions - Flying machine (1488–1489)

The aim of this extraordinarily complex study was to mimic the different phases of the flight of birds.

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