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A voltaic cell is constructed using the reaction of chromium metal and iron(II) ions. 2 Cr(s) + 3 Fe 2+ (aq) → 2 Cr 3+ (aq) + 3 Fe(s) Complete the following sentences: Electrons in the external circuit flow from the ________ electrode to the ______ electrode. Negative ions move in the salt bridge from the ________ half-cell to the ______ half-cell. The half-reaction at the anode is _______ and that at the cathode is ________.

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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 19, Problem 7PS
Textbook Problem
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A voltaic cell is constructed using the reaction of chromium metal and iron(II) ions.

2 Cr(s) + 3 Fe2+(aq) → 2 Cr3+(aq) + 3 Fe(s)

Complete the following sentences: Electrons in the external circuit flow from the ________ electrode to the ______ electrode. Negative ions move in the salt bridge from the ________ half-cell to the ______ half-cell. The half-reaction at the anode is _______ and that at the cathode is ________.

Interpretation Introduction

Interpretation:

The following sentences have to be completed.

A voltaic cell is constructed using the reaction of chromium metal and iron (II)ions.

2Cr(s) + 3Fe2+(aq) 2Cr3+(aq) + 3Fe(s)

Electrons in the external circuit flow from the ____ electrode to the ____electrode. Negative ions move via the salt bridge from the ____half cell to the _____half cell. The half reaction at the anode is _________, and that at the cathode is ______________.

Concept introduction:

Voltaic cell or Galvanic cell:

The device to produce electricity by using chemical reactions. In these divces are redox chemical reactions are occured.

A voltaic cell converts chemical energy into electrical energy.

It consists of two half cells. Each half cell consists of a metal and a solution of a salt of metal. Two half cells are connected by salt bridge.

The chemical reaction in the half cell is an oxidation reduction (redox)reactions.

For example:

Cell diagram of voltaic or galvanic cell is as follows.

                 Salt bridge                        Cu(s)|Cu2+(aq)  ||  Ag+(aq)|Ag(s)____________     ___________                                       Half cell             Half cell

Explanation of Solution

The given reaction is as follows.

2Cr(s) + 3Fe2+(aq) 2Cr3+(aq) + 3Fe(s)

In the voltaic cell has two half cells. In this cell oxidation occurs at anode and reduction occurs at cathode.

From the given reaction, Cr atom increases their oxidation state 0 to +3.Therefore, it is an oxidation reaction and occurs at anode.

Fe atom reduces their oxidation state +2 to 0. Therefore, it is a reduction reaction occurs at cathode

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Chapter 19 Solutions

Chemistry & Chemical Reactivity
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Ch. 19.3 - Which of the following statements is correct for...Ch. 19.3 - 2. You can determine if an automobile lead-based...Ch. 19.4 - (a) Rank the following metals in their ability to...Ch. 19.4 - The net reaction that occurs in a voltaic cell is...Ch. 19.4 - 2. Which metal in the following list is easiest to...Ch. 19.4 - Determine which of the following redox equations...Ch. 19.4 - A lithium ion battery produces a voltage of 3.6 V....Ch. 19.4 - Use the energy produced by the combustion of...Ch. 19.4 - What mass of lithium ion batteries would produce...Ch. 19.5 - A voltaic cell is set up with an aluminum...Ch. 19.5 - Check Your Understanding The half-cells Fe2+(aq,...Ch. 19.5 - 1. Calculate Ecell at 298 K for a cell involving...Ch. 19.6 - The following reaction has an E value of 0.76 V:...Ch. 19.6 - Calculate the equilibrium constant at 25 C for the...Ch. 19.6 - 1. 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