3.1 Calcium sulfate aka gypsum often used for construction
3.2 carbon monoxide dangerous part of exhaust
3.3 ammonium carbonate used in baking powders
3.4 silicon dioxide aka silica for making glass
3.5 Ferric oxide used in paints and coatings
3.6 potassium bromide which was used in veterinary medicine for the treatment of epilepsy
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