or log in
A compound ion, the main source of nitrogen for plants.
Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.
The halogens and the metals combine to produce bromides.
The face-centred cubic metal lattice allows the closest fit of metal atoms.
A white, crystalline compound that breaks down when affected by light.
We prepare a special “elephant toothpaste” with some hydrogen peroxide, liquid soap and food...
A colourless, heavier-than-air gas, an intermediate in the production of nitric acid.
One of the oxides of sulphur, forms sulphuric acid with water.