Calcium Hydroxide is "slaked lime"
Calcium Sulphate is "Plaster of Paris"Calcium Hydrogen Sulfite is also called "calcium bisulfite" and is a food preservativeI find few references on the internet...
H2S is hydrogen sulfide. It is a gas an normal pressure and at anything above -60.28 °C. The gas has a density of 1.363 grams per litre.
Wikipedia has more particulars on this toxic and flammable...