Dissolution of NaCl

Common salt is dissolved by water: polar water molecules form a coat around the ions.

Reaction of hydrogen with oxygen

Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.

Dissolution of hydrogen chloride (HCl) in water

The solution of hydrogen chloride in water is called hydrochloric acid.

Reaction of zinc with hydrochloric acid

The dissolution of zinc in hydrochloric acid produces hydrogen gas.

Producing ammonia from nitrogen gas and hydrogen gas

Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.

Rosetta Stone

The Rosetta Stone helped to solve the mystery of hieroglyphics.

Thermal expansion of bridges

The length of the metal frameworks of bridges change when the temperature changes.

Sphere

A sphere is the set of points which are all within the same distance from a given point in space.

Seafloor map

The boundaries of tectonic plates can be seen on the seafloor.

Glacier (intermediate)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.

SM U-35 submarine (Germany, 1912)

Submarines had an important role in naval warfare as early as World War I.

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric current flowing in it.

Thyroid gland

An important endocrine gland producing hormones that affect metabolism and the calcium balance of the body.

Cylindrical solids

This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.

Aeolian landforms on coasts and steppes

Wind, as an external force, plays an important role in shaping coastal areas and steppes.

Cube

This animation demonstrates the components (vertices, edges, diagonals and faces) of the cube, one of the Platonic solids.

Dodo

The dodo is an extinct species of birds that used to be native to the island of Mauritius. It has become the symbol of extinction.

The Battle of Jutland (1916)

The naval battle fought by the British Navy against the German Navy was the largest sea battle in World War I.

Cube of cubes

An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.

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