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Ch.20 - Electrochemistry
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.20 - ElectrochemistryProblema 28c
Capitolo 20, Problema 28c

Indicate whether each statement is true or false: (c) A salt bridge or permeable barrier is necessary to allow a voltaic cell to operate.

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Understand the function of a voltaic cell: A voltaic cell, also known as a galvanic cell, is an electrochemical cell that uses a chemical reaction to produce electrical energy.
Identify the role of a salt bridge: A salt bridge or permeable barrier is used to maintain electrical neutrality within the internal circuit, preventing the solutions in the two half-cells from mixing directly.
Consider the consequences of not having a salt bridge: Without a salt bridge, the flow of electrons would stop as the solutions in the half-cells would quickly become charged, disrupting the flow of electricity.
Evaluate the necessity of the salt bridge: Since the salt bridge is crucial for maintaining charge balance and allowing the continuous flow of electrons, it is necessary for the operation of a voltaic cell.
Conclude the statement: Based on the understanding that a salt bridge is essential for the operation of a voltaic cell, determine whether the statement is true or false.

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Voltaic Cell

A voltaic cell, also known as a galvanic cell, is an electrochemical cell that converts chemical energy into electrical energy through spontaneous redox reactions. It consists of two half-cells, each containing an electrode and an electrolyte, which are connected by a conductive path. The flow of electrons from the anode to the cathode generates an electric current.
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The Electrolytic Cell

Salt Bridge

A salt bridge is a device used in voltaic cells to maintain electrical neutrality by allowing the flow of ions between the two half-cells. It typically contains a gel or solution of an inert electrolyte, which prevents the mixing of the two different solutions while enabling ion migration. This is crucial for completing the circuit and sustaining the flow of electrons.
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Ionic Salts

Electrochemical Reactions

Electrochemical reactions involve the transfer of electrons between chemical species, leading to oxidation and reduction processes. In a voltaic cell, oxidation occurs at the anode, where electrons are released, while reduction occurs at the cathode, where electrons are accepted. The movement of electrons through an external circuit and ions through the salt bridge is essential for the cell's operation.
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02:46
Electrochemical Cells
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Domanda del libro di testo

Complete and balance the following equations, and identify the oxidizing and reducing agents. (Recall that the O atoms in hydrogen peroxide, H2O2, have an atypical oxidation state.) H2O21aq2 + ClO21aq2 ¡ ClO2-1aq2 + O21g2 (basic solution)

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Domanda del libro di testo

(a) What is the definition of the volt?

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Domanda del libro di testo

A voltaic cell similar to that shown in Figure 20.5 is constructed. One electrode half-cell consists of a silver strip placed in a solution of AgNO3, and the other has an iron strip placed in a solution of FeCl2. The overall cell reaction is Fe1s2 + 2 Ag+1aq2 ¡ Fe2+1aq2 + 2 Ag1s2 (f) In which directions do the cations and anions migrate through the solution?

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Domanda del libro di testo

(b) Do all voltaic cells produce a positive cell potential?

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