Voltaic cells diagramming

The overall reaction occurring in the voltaic cell diagrammed in (19.7) can be represented as... 

Draw a diagram for a voltaic cell, labeling electrodes and direction of current flow. (Example 18.1 Problems 3-8) Questions and Problems assignable in OWL 2,6... 

The diagram shows a student s setup for a voltaic cell. Which change would help ensure that electron flow would continue indefinitely ... 

There are two types of cells electrolytic (which requires a battery or external power source) and voltaic (which requires no battery or external power source). The reaction in the diagram is voltaic and therefore spontaneous. In a voltaic cell, the anode is the negative terminal, and oxidation occurs at the anode. Remember the OIL portion of OIL RIG (Oxidation Is Losing electrons) and AN OX (ANode is where Oxidation occurs). 

Formulating Models Sketch a diagram of the flow of electrons for one of the voltaic cells made in the lab. Be sure to label the electrons, reduction, oxidation, cathode, and anode. 

Fig. 3-6. Diagram showing the equipotential line and ionic current flow line distribution around an electronic conductor in bedrock, after the model of Govett (1973) and Bolviken and Logn (1975). The conductor is shown to be self-polarising and to generate an electrical field. As such, this current and equipotential line configuration represents that of an electrolytic cell, not a voltaic cell (from Govett et al., 1976).

A voltaic cell containing a standard Fe /Fe electrode and a standard Ga /Ga electrode is constructed, and the circuit is closed. Without consulting the table of standard reduction potentials, diagram and completely describe the cell from the following experimental observations, (i) The mass of the gallium electrode decreases, and the gallium ion concentration increases around that elec-... 

Suppose we set up a voltaic cell based on this reaction, (a) What half-reaction would represent the reduction in this cell (b) What half-reaction would represent the oxidation (c) Which metal would be the anode (d) Which metal would be the cathode (e) Diagram this cell. 

This diagram shows the key components of a voltaic cell composed of the Zn/Zn and Cu/Cu2+ half-cells. 

Several methods for using the human body as a voltaic cell have been suggested. One of these is to insert platinum and zinc electrodes into the human body as diagrammed in the figure below. The pacemaker and the electrodes would be worn internally. This "body battery" could easily generate the small amount of current (5 X 10 ampere) that is required by most pacemakers. This "body battery" has been tested on animals for periods exceeding four months without noticeable problems. 

SAMPLE PROBLEM 21.2 Describing a Voltaic Cell with Diagram and Notation... 

Problem Draw a diagram, show balanced equations, and write the notation for a voltaic cell that consists of one half-cell with a Cr bar in a Cr(N03)3 solution, another half-cell with an Ag bar in an AgN03 solution, and a KNO3 salt bridge. Measurement indicates that the Cr electrode is negative relative to the Ag electrode. 

Comment The key to diagramming a voltaic cell is to use the direction of the spontaneous reaction to identify the oxidation (anode negative) and reduction (cathode positive) half-reactions. 

FOLLOW-UP PROBLEM 21.2 In one compartment of a voltaic cell, a graphite rod dips into an acidic solution of K2Cr207 and Cr(N03)3 in the other compartment, a tin bar dips into a Sn(N03)2 solution. A KNO3 salt bridge joins them. The tin electrode is negative relative to the graphite. Draw a diagram of the cell, show the balanced equations, and write the cell notation. 

Describe the physical makeup of a voltaic cell, and explain the direction of electron flow draw a diagram and write the notation for a voltaic cell ( 21.2) (SP 21.2) (EPs 21.13-21.23)... 

Figure 20.25 illustrates a voltaic cell consisting of a strip of zinc in a l.OM solution of zinc nitrate and a strip of silver in a l.OM solution of silver nitrate. Use the diagram and Table 20.1 to answer these questions. 

The diagram that follows represents a molecular view of a process occurring at an electrode in a voltaic celL... 

A Figure 20.13 The half-cell potentials for the voltaic cell in Figure 20.5, diagrammed in the style of Figure 20.12. 

Diagram of a Voltaic Cell As Figures 21.4A and 21.5 show, there are certain consistent features in the diagram of any voltaic cell ... 

Check Always be sure that the half-reactions and the cell reaction are balanced, the half-cells contain all components of the half-reactions, and the electron and ion flow are shown. You should be able to write the half-reactions from the cell notation as a check. Comment The diagram of a voltaic cell relies on the direction of the spontaneous reaction to give the oxidation (anode negative) and reduction (cathode positive) half-reactions. 

Electrochemical or voltaic cells can be represented by cell diagrams. For example, the Daniell cell is represented as... 

Cu(N03)2(aq) + NO(g) + H20(l) b i Draw a diagram for the voltaic cell formed by connecting the following standard half-cells ... 

Draw a diagram of a voltaic cell whose two halfreactions consist of Ag in AgNOg and Ni in NiSO. Identify the anode and cathode, and indicate the directions in which the electrons and ions are moving. 

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