Trans-2-butene (C₄H₈)

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

Nitrate ion (NO₃⁻)

A compound ion, the main source of nitrogen for plants.

Hydrogen (H₂)

Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.

Tennis court

Tennis is played on a court covered with grass, clay or synthetic material.

Isolated settlement (forester´s house)

Foresters adjusted their lifestyle to the forest environment.

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.

Ethyl acetate (C₄H₈O₂)

One of the most important esters, produced by the reaction of ethanol and acetic acid.

Hydrogen chloride (HCl)

A colourless gas with a pungent odour, its solution in water is called hydrochloric acid.

Palmitic acid (hexadecanoic acid) (C₁₅H₃₁COOH)

A white, waxy substance, a carboxylic acid of high carbon number.

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