Nitric acid (HNO₃)

One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.

Conformations of ethane

The staggered conformation of ethane is more stable than the eclipsed conformation.

Lead-acid battery

Electrochemical processes in a lead-acid battery produce electric current.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.

Soil pollution

This animation demonstrates the main sources of soil pollution.

Carbon dioxide (CO₂) (intermediate)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Carbonate ion (CO₃²⁻)

A compound ion produced from carbonic acid by releasing protons.

Carbon monoxide (CO) (intermediate)

Colourless, odourless gas, highly toxic to humans and animals in high concentration.

Nitrogen (N₂) (intermediate)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Oxygen (O₂) (intermediate)

A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

Copper sulphate (CuSO₄)

A compound of sulphur often used as a pesticide.

Oxygen (O₂) (beginner)

A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

Silicon

A crystalline substance, an extremely important material in the electronics industry (semiconductors, integrated circuits).

Nitrogen (N₂) (basic)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Carbon dioxide (CO₂) (beginner)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Molecule exercise V (Oxo compounds)

An exercise about the groups and structure of oxo compounds.

Molecule exercise VI (Carbohydrates)

An exercise about the groups and structure of mono-, di- and polysaccharides.

Molecule exercise VII (Organic nitrogen compounds)

An exercise about the groups and structure of organic nitrogen compounds.

Phosphorus trichloride (PCl₃)

Colourless liquid that gives off smoke in moist air.

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