Printed circuit board

This animation demonstrates the structure of small, mass-produced circuit boards.

Phosphorus trichloride (PCl₃)

Colourless liquid that gives off smoke in moist air.

Comparison of halogens

Halogen elements are a group in the periodic table consisting of five chemically related elements, fluorine, chlorine, bromine, iodine, and astatine.

Hungarian hussar

The term ´hussar´ refers to a type of light cavalry which originated in Hungary and was the most popular in the 18th–19th centuries.

Amylose ((C₆H₁₀O₅)n)

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

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.

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.

Views

Pick the shape that is shown in different views below.

Hypochlorite ion (OCl⁻)

Hypochlorite ions are formed when water is disinfected with chlorine.

Fibroin

Fibroin is a fibrillar protein excreted by silkworms.

Construction of a panel building

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

Alpha-D-glucose (C₆H₁₂O₆)

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

Cuboid (exercises)

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

Sulphuric acid (H₂SO₄)

A colourless, viscous liquid, a highly corrosive, strong acid used in several industrial processes.

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