I really need these solved, it’s asking for half equations!!

Net equation: Cu + 2Ag+  ⇒ 2Ag + Cu2+

Explanation:

Cu + 2N03- + 2Ag+ ⇒ 2Ag + 2NO3- + Cu2+

The 2NO3- cancel out since they're spectator ions

∴ Cu + 2Ag+ ⇒ 2Ag + Cu2+

Half equations are:

Cu ⇒ Cu2+

2Ag+ ⇒ 2Ag

Balancing both sides of each equation with electrons will lead back to the Net equation.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.