5. Explain the mechanisms of “activation polarization” and “concentration polarization” in electrochemical processes by words and diagrams, respectively.

2. The reaction of ethane gas (C2H6) with chlorine gas produces C2H5Cl as its main product (along with HCl) and a variety of other minor products. Calculate the percent yield of C2H5Cl if the reaction of 300. g of ethane with 650. g of chlorine produced 490. g of C2H5Cl. (atomic mass: C, 12.01； Cl, 35.45； H, 1.008)