An oxidation-reduction reaction (redox)reaction involves the transfer of electrons from the reducing agent to the oxidising agent OXIDATION-is the LOSS of electrons REDUCTION-is the GAIN of electrons Zn (s)->Zn2+(aq)+2e-(aq)OXIDATION Cu2+(aq)+2e-(aq)->Cu (s)REDUCTION These represents the oxidation reduction HALF-EQUATIONS PDF文件使用"pdfFactory Pro”试用版本创建m,fineprint.com,c里
• An oxidation-reduction reaction (redox) reaction involves the transfer of electrons from the reducing agent to the oxidising agent OXIDATION - is the LOSS of electrons REDUCTION - is the GAIN of electrons Zn (s) ® Zn2+ (aq) + 2e- (aq) OXIDATION Cu2+ (aq) + 2e- (aq) ® Cu (s) REDUCTION These represents the oxidation reduction HALF-EQUATIONS PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn
Electrochemical cells An electrochemical cell consists of two electrodes,or metallic conductors,in contact with an electrolyte,an ionic conductor(which may be a solution,a liquid,or a solid). An electrode and its electrolyte comprise an electrode compartment.The two electrodes may share the same compartment. If the electrolytes are different,the two compartments may be joined by a salt bridge,which is a tube containing a concentrated electrolyte solution in agar jelly that completes the electrical circuit and enables the cell to function. PDF文件使用"pdfFactory Pro”试用版本创建耀m,fineprint.com,cn
Electrochemical cells An electrochemical cell consists of two electrodes, or metallic conductors, in contact with an electrolyte, an ionic conductor (which may be a solution, a liquid, or a solid). An electrode and its electrolyte comprise an electrode compartment. The two electrodes may share the same compartment. If the electrolytes are different, the two compartments may be joined by a salt bridge, which is a tube containing a concentrated electrolyte solution in agar jelly that completes the electrical circuit and enables the cell to function. PDF 文件使用 "pdfFactory Pro" 试用版本创建 耀www.fineprint.com.cn
Reactions at electrodes The reduction and oxidation processes responsible for the overall reaction in a cell are separated in space: oxidation takes place in one electrode compartment and reduction takes place in the other compartment.As the reaction proceeds,the electrons released in the oxidation Red1→Ox+ze at one electrode travel through the external circuit and re-enter the cell through the other electrode.There they bring about reduction: Ox2+ze→Red So,the electric mechanism of electrolyte solution includes the reactions of electrodes and the ions movements in the solution. PDF文件使用"pdfFactory Pro”试用版本创建fww.fineprint.com.cn
Reactions at electrodes The reduction and oxidation processes responsible for the overall reaction in a cell are separated in space: oxidation takes place in one electrode compartment and reduction takes place in the other compartment. As the reaction proceeds, the electrons released in the oxidation Red1 Ox1+ z eat one electrode travel through the external circuit and re-enter the cell through the other electrode. There they bring about reduction: Ox2 + z e- Red2 So, the electric mechanism of electrolyte solution includes the reactions of electrodes and the ions movements in the solution. PDF 文件使用 "pdfFactory Pro" 试用版本创建 fwww.fineprint.com.cn
The Naming of Electrodes According to reduction and oxidation, Cathode---the electrode at which reduction occurs is called the cathode. Anode---the electrode at which oxidation occurs is called the anode. According to cell potential, Positive electrode---the electrode which has high potential is called positive electrode. Negative electrode---the electrode which has low potential is called negative electrode. PDF文件使用"pdfFactory Pro”试用版本创建fmm,fineprint.com,cn
The Naming of Electrodes According to reduction and oxidation, Cathode--- the electrode at which reduction occurs is called the cathode. Anode--- the electrode at which oxidation occurs is called the anode. According to cell potential, Positive electrode--- the electrode which has high potential is called positive electrode. Negative electrode---the electrode which has low potential is called negative electrode. PDF 文件使用 "pdfFactory Pro" 试用版本创建 fwww.fineprint.com.cn
.Electrolytic Cell:positive electrode anode negative electrode cathode .Electrochemical Cell:positive electrode cathode negative electrode anode Anode Cathode Process: Oxidation Reduction Potential:Low(-) High(+)for electrochemical cell High(+) Low(-)for electrolytic cell PDF文件使用"pdfFactory Pro'”试用版本创建wm,fineprint.com,cn
•Electrolytic Cell: positive electrode = anode negative electrode = cathode •Electrochemical Cell: positive electrode = cathode negative electrode = anode Anode Cathode Process: Oxidation Reduction Potential: Low(-) High(+) for electrochemical cell High(+) Low(-) for electrolytic cell PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn