Labour camp in Hungary (Recsk)

About 1,500 people were taken to the labour camp also known as ‘the Hungarian Gulag’ during the Rákosi era.

Carbon dioxide (CO₂) (basic)

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

Hungarian army in the 15th century (infantry)

One of the main units of Matthias Corvinus´ Black Army was the infantry.

Phosphorus trichloride (PCl₃)

Colourless liquid that gives off smoke in moist air.

Fibroin

Fibroin is a fibrillar protein excreted by silkworms.

Bin lorries

Bin lorries play an important role in the life of towns and cities.

Yurt

A circular, domed, portable tent covered by felt, typically used by nomadic peoples.

Net of a cube (exercises)

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

Views

Pick the shape that is shown in different views below.

Silicon dioxide (SiO₂)

A polymorphic compound, mostly found in the form of quartz.

Silver chloride (AgCl)

A white, crystalline compound that breaks down when affected by light.

Hypochlorite ion (OCl⁻)

Hypochlorite ions are formed when water is disinfected with chlorine.

Amylose ((C₆H₁₀O₅)n)

A helical molecule consisting of alpha-D-glucose units. It is one of the basic components of starch.

Alpha-D-glucose (C₆H₁₂O₆)

Alpha-D-glucose is one of the stereoisomers of glucoses, specifically the D-glucoses.

Construction of a panel building

Buildings constructed of prefabricated concrete blocks were widespread in the former Socialist countries.

Cuboid (exercises)

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

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