Ionic Compound Formula Writing Worksheet Write chemical formulas for the compounds in each box. Calcium sulfate or calcium sulphate is the inorganic compound with the formula CaSO 4 and related hydratesIn the form of γ-anhydrite the anhydrous form it is used as a desiccantOne particular hydrate is better known as plaster of Paris and another occurs naturally as the mineral gypsumIt has many uses in industry. Pin By Ncert Solutions On Aplus Topper Chemistry Class Chemistry Chemical Equation Zinc iron II iron III gallium silver lead IV chloride ZnCl 2. . The names are found by finding the intersection between the cations and anions. All forms are white solids that are poorly soluble in water. The first box is the intersection between the zinc cation and the chloride anion so you should write ZnCl 2 as shown.