Unformatted text preview: t displace any elements listed above them. For example Ag cannot displace any elements listed above it fro m one of its compounds. Ag (s) + CuCl2 (aq) ® No Reaction Ag (s) + HCl (aq) ® No Reaction Examples: Use activit y series to complete each reaction belo w. If no reaction occurs, write “No Reaction”. 1. Pb (s) + HCl ® 2. Zn (s) + MgCl2 (aq) ® 3. Ni (s) + CuCl2 (aq) ® 4. Mg (s) + AlCl3 (aq) ® 7 Chemistry 52 Chapter 17 ELECTROLYSIS
· The process by which electrical energy is used to bring about a nonspontaneous chemical change is called electrolysis. For example water can be deco mposed to its elements through electrolysis: elec ic 2 H 2O (l) ¾c¾ter¾ 2 H 2 (g) + O 2 (g)
u rr n t · The apparatus in which electrolys is is performed is called electrolytic cell. The cell consists of a posit ive electrode (anode) and a negat ive electrode (cathode).
· In an electrolyt ic cell electricalenergy fro m the voltage source is used to bring about non spontaneous redox reactions. For example, the electrolysis o f HCl is shown below. · The cations migrate toward the cathode (–) and are reduced. +
2 H (aq) + 2 e- ® H2 (g) Reduction halfreaction · The anio ns migrate toward the anode (+) and are oxidized. 2 Cl- (aq) ® Cl2 (g) + 2 e- Oxidation halfreaction · The overall react ion can be obtained by adding the two halfreactions. 2 HCl (aq) ® H2 (g) + Cl2 (g) 8 Overall reaction Chemis...
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