Al+O2=? Ba+CuO=Cu+? NaCI=?+? Fe+O2=?

Question

Al+O2=?
Ba+CuO=Cu+?
NaCI=?+?
Fe+O2=?

Answer 1

4Al +3 O2 -> 2Al2O3

Ba + CuO _> BaO + Cu

2NaCl -> 2Na + Cl2

4Fe + 3O2 -> 2Fe2O3