A quick overview regarding redox reactions for grade 10's. There are no ionic equations here, and no oxidation numbers yet. This will be re-uploaded as soon as the chapter is completed.
5. Zn atoms (atoms are always electrically neutral)
loses two electrons, becoming positively charged
Zn-ions.
Zn Zn2+ + 2e-
Oxidation: electrons lost
6. Copper(II)sulphate consist of copper ions and
sulfate ions. Electrons from the Zn-atoms are
transferred to the copper ions. The copper ions gain
the electrons and copper atoms forms. They
combine to form a copper precipitate in the
solution.
Cu2+ + 2e- Cu
Reduction: electrons gained
7. The sulphate ions are spectator
ions.
Spectator ions are present in a reaction, without
experiencing oxidation or reduction.