Copper oxalate
Copper Oxalate
Cu2O. Cuprous is Cu+, cupric is Cu2+. Those are old-school names. Copper(I) oxide is a better name.
CoF2 its a type II binary ionic compound. therefore you take the cation (Co) and its charge (+2 as indicated by the II) and the anion (F) and its charge (-1) and combine the two like this: Co+2F-1 . you then cross the charges to get CoF2.
The equation for the reaction between potassium chromate (K2CrO4) and copper sulfate (CuSO4) is: 2K2CrO4 + 3CuSO4 -> 2Cr2(SO4)3 + 3CuCrO4(s) This reaction produces chromium(III) sulfate and copper chromate as the products.