Metals forming hexagonal metallic lattices are rigid and difficult to machine.
During the substitution reaction the hydrogen atoms of methane are substituted with chlorine atoms, the by-product is hydrogen chloride.
Fatty acid molecules consist of a polar head and a non-polar tail, therefore they are suitable for removing fat stains.
Colourless, moderate acid, only known in aqueous solution.
During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.
Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.
The least tightly packed crystal structure.
The face-centred cubic metal lattice allows the closest fit of metal atoms.
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
Addition is a reaction in which the molecules of two or more substances unite without the formation of a by-product.
Karst formations include dolines and dripstones.
Polymerised ethylene is known as polyethylene, a type of plastic.
Raw iron is produced from iron ore in iron smelters.
Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
Metal atoms form a regular lattice structure.
The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.
Colourless, odourless liquid produced by dissolving carbon dioxide in water.
Common salt is dissolved by water: polar water molecules form a coat around the ions.