1. Electroplating

2. The electroplating of an object with metal is accomplished using an electrolytic cell. There are some basic rules for electroplating.  The object to be plated must always be the cathode in the electrolytic cell. Thus, it must always be connected to the negative pole of the electric source.  The anode in the electrolytic cell must be made from the plating metal.  The electrolyte used in the electrolytic cell must contain the cation of the plating metal.

3. off Ag AgNO 3(aq) Ag + -+ power source on Ag NO 3 - e-e- e-e- e- e-  e- e-  e- e-   e- e- e-e- e-e- Ag Ag + Copper spoon Electroplating cathodeanode

4. Electroplating Ex.1) Electrons enter into the ____ (+/-) pole of a battery and exit out from the ____(+/-) pole of the a battery. Ex.2) When electroplating, the electrolyte used needs to contain the same metal as the _______________ __________ Ex.3) In the electrolytic process used to plate pure copper onto the surface of a material, the material should be connected in the electroplating device as the (1) cathode which is positive (2) cathode which is negative (3) anode which is positive (4) anode which is negative + _ plating metal

5. Electroplating Ex.4) Which of the following cells is set up properly to electroplate a silver spoon with gold? (1) (3) (2)(4) battery - + AgNO 3(aq) Ag (s) battery - + Au(NO 3 ) 3(aq) Au (s) battery + - AgNO 3(aq) Ag (s) battery + - Au(NO 3 ) 3(aq) Au (s)

6. Electroplating Ex.5) Complete the set up in order to electroplate the piece of zinc pipe with copper. [DRAW LINES TO REPRESENT THE WIRES] The metal strip is made of ____________ What salt would you add? ____________ Battery + - copper Cu(NO 3 ) 2

7. Electroplating Ex. (6) The diagram below shows a key to be plated with silver in an electrolytic cell. Draw lines from the battery to the key and from the battery to the silver electrode to correctly set-up the electrolytic cell. + - Battery  Silver electrode AgNO 3 solution A B

8. Electroplating Ex. (7) Given the reduction reaction for the cell above: Ag 1+ (aq) + 1e - → Ag (s) This reaction occurs at (1) A, which is the anode (2) A, which is the cathode (3) B, which is the anode (4) B, which is the cathode  + - Battery Silver electrode AgNO 3 solution A B