When writing a redox reaction, how do you know what element/compound to put as the product? Also, does it matter which reactant is written first on the left side of the formula?
Examples:
2AgNO3+Cu--->Cu(NO3)2+2Ag (why copper nitrate instead of silver)
or
2Al+ 3CuCl2---> 3Cu + 2AlCl3 (why copper instead of aluminum chloride)
or
Mg+2HCl--->MgCl2+H2
Any help is appreciated!