1) Zn(s)+CuSO4(aq) ----> ZnSO4(aq) + Cu(s). Which of the following half-equation is correct? a) Zn(s) - e- ---> Zn-(aq) b) Zn(s) ---> Zn2+(aq) + 2e- c) Cu+(aq) + e- ---> Cu(s)  d) Cu(s) ---> Cu2+(aq) + 2e- 2) In summing up the two half-equations, the number of electrons on both sides of the equation not necessary to be the same. This sentence is true or false? a) True b) False 3) A reduced substance is an electron____________.  a) donor b) acceptor c) supplier d) transfer 4) The negative terminal is the electrode where electrons are_______ while positive terminal is the electrode where electrons are_______.  a) gaining, losing b) losing, gaining c) accepted, released d) released, accepted 5) The definitions of redox reactions can be explained in terms of a) electron donor b) electron acceptor c) electron transfer d) electron cloud

Electron Transfer

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