English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 079 CuCl copper(I) chloride Cu(ClO3)2 · 6H2O copper(II) chlorate - hexahydrate CuCl2 copper(II) chloride CuFeS2 copper iron sulfide CuFe2O4 copper(II) iron(II) oxide CuFe2S3 copper iron sulfide [Cu(H2O)4]SO4 · H2O blue vitriol CuI copper(I) iodide