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Ch.19 - Electrochemistry
Tro - Chemistry: A Molecular Approach 4th Edition
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Not the one you use?Change textbook
All textbooksTro 4th EditionCh.19 - ElectrochemistryProblem 64
Chapter 19, Problem 64

Which of the following metals is the best reducing agent? a. Mn b. Al c. Ni d. Cr

Verified step by step guidance
1
insert step 1> Identify the concept of a reducing agent. A reducing agent is a substance that loses electrons and is oxidized in a chemical reaction.
insert step 2> Consider the standard reduction potentials for each metal. The more negative the reduction potential, the better the metal is at losing electrons, making it a better reducing agent.
insert step 3> Look up the standard reduction potentials for each metal: Mn, Al, Ni, and Cr.
insert step 4> Compare the reduction potentials. The metal with the most negative reduction potential is the best reducing agent.
insert step 5> Determine which metal has the most negative reduction potential and conclude that it is the best reducing agent among the options provided.

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Reducing Agents

A reducing agent is a substance that donates electrons in a chemical reaction, thereby reducing another substance. The strength of a reducing agent is determined by its ability to lose electrons easily. Metals tend to be good reducing agents because they have low ionization energies and can readily give up their valence electrons.
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Oxidizing and Reducing Agents

Electrochemical Series

The electrochemical series is a list of elements organized by their standard electrode potentials. Metals that are higher in the series are more likely to be oxidized and act as reducing agents. Understanding where a metal falls in this series helps predict its reactivity and ability to reduce other substances.

Metal Reactivity

Metal reactivity refers to how readily a metal can participate in chemical reactions, particularly oxidation-reduction reactions. Generally, alkali and alkaline earth metals are more reactive than transition metals. In the context of the question, comparing the reactivity of Mn, Al, Ni, and Cr will help identify which is the best reducing agent.
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Transition Metals
Related Practice
Textbook Question

Which metal cation is the best oxidizing agent? a. Pb2+ b. Cr3+ c. Fe2+ d. Sn2+

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Textbook Question

Calculate E°cell for each balanced redox reaction and determine if the reaction is spontaneous as written. a. O2(g) + 2 H2O(l) + 4 Ag(s) → 4 OH–(aq) + 4 Ag+(aq) b. Br2(l) + 2 I–(aq) → 2 Br–(aq) + I2(s)

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Textbook Question

Calculate E°cell for each balanced redox reaction and determine if the reaction is spontaneous as written. c. PbO2(s) + 4 H+(aq) + Sn(s) → Pb2+(aq) + 2 H2O(l) + Sn2+(aq)

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Textbook Question

Calculate the equilibrium constant for each of the reactions in Problem 65.

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Textbook Question

Use tabulated electrode potentials to calculate ∆G°rxn for each reaction at 25 °C. a. 2 Fe3+(aq) + 3 Sn(s) → 2 Fe(s) + 3 Sn2+(aq) b. O2(g) + 2 H2O(l) + 2 Cu(s) → 4 OH–(aq) + 2 Cu2+(aq) c. Br2(l) + 2 I–(aq) → 2 Br–(aq) + I2(s)

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Textbook Question

Use tabulated electrode potentials to calculate ∆G°rxn for each reaction at 25 °C. b. Br2(l) + 2 Cl–(aq) → 2 Br–(aq) + Cl2(g) c. MnO2(s) + 4 H+(aq) + Cu(s) → Mn2+(aq) + 2 H2O(l) + Cu2+(aq)

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