Question

show the formation of CaOby the transfer of electrons the atomic number of Ca is 20 and that of oxygen is 8
(1) a student was given gold,iron and copper metals. identify which of them will react with steam to give H2 gas. write the equation involved
(2) write the method of extraction involved in the following cases:(1)metals of high reactivity (2)metals of medium reactivity (3)metals of low reactivity

Answer 1

Ca2+ + O2 -> CaO
Ca2+ + 2e- -----> Burning gives CaO


Cu reacts with steam
2Cu2+ + H2O ----> Cu2O +2H+