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Net of a cube (exercises)

Not all nets consisting of 6 congruent squares are foldable into cubes.

Battle of Muhi (April 11-12, 1241)

The devastating defeat of the Hungarians in the battle against the Mongolians was the result of several bad decisions.

Molecule exercise VII (Organic nitrogen compounds)

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

Folding (intermediate)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.

Molecule exercise V (Oxo compounds)

An exercise about the groups and structure of oxo compounds.

Cuboid (exercises)

Edges, diagonals and faces of a cuboid can be identified by its vertices.

Political and economic unions

Several political and economic unions have been formed between countries during the past decades.

Views

Pick the shape that is shown in different views below.

Volume of spheres (demonstration)

The sum of the volume of the ´tetrahedrons´ gives an approximation of the volume of the sphere.

The water cycle (basic)

Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.

Pyrimidine (C₄H₄N₂)

A heterocyclic organic compound, its derivatives are thymine, cytosine and uracil.

Dynamo (basic)

A dynamo converts mechanical energy into direct current.

Clothing (Western Europe, 1980s)

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

Oxygen (O₂) (beginner)

A colorless, odorless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

Carbon dioxide (CO₂) (beginner)

Colorless, odorless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Carbon monoxide (CO) (beginner)

Colorless, odorless gas, highly toxic to humans and animals in high concentration.

Nitrogen (N₂) (basic)

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

The Forbidden City (Beijing, 17th century)

The Forbidden City is one of the most magnificent and mysterious monuments of imperial China.

Evaporation and boiling

What happens in a liquid during evaporation and boiling? What does its boiling point depend on?

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