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An exercise about the polarity of molecules.
An exercise about hydrocarbons.
A compound ion generated when a proton is added to an ammonia molecule.
Limestone is a widely and diversely used material.
A compound ion produced from carbonic acid by releasing protons.
A compound ion, the main source of nitrogen for plants.
Potassium permanganate is used as a disinfectant.
Colourless liquid that gives off smoke in moist air.
A compound ion produced when sulphuric acid releases protons.
Sulphur dioxide emission is the main cause of acid rains. It is an intermediate product in the production of sulphuric acid.
One of the oxides of sulphur, forms sulphuric acid with water.