Domanda del libro di testo
A mercury battery uses the following electrode half-reactions: (c) What is the effect on the cell voltage of a tenfold change in the concentration of KOH in the electrolyte? Explain..
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Ch.19 - Electrochemistry
McMurry8th EditionChemistryISBN: 9781292336145
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TOC.tableOfContents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
Capitolo 19, Problema 128
What is meant by cathodic protection? (a) Steel is coated with a layer of paint. (b) Iron in steel is oxidized to form a protective oxide coating. (c) Steel is coated with zinc because zinc is more easily oxidized than iron. (d) A strip of magnesium is attached to steel because the magnesium is more easily oxidized than iron.
Guida verificata passo dopo passo1
Understand the concept of cathodic protection: It is a technique used to prevent corrosion of a metal surface by making it the cathode of an electrochemical cell.
Identify the role of a sacrificial anode: In cathodic protection, a more easily oxidized metal (sacrificial anode) is used to protect the metal of interest (cathode).
Analyze the options: Determine which option involves using a more easily oxidized metal to protect steel.
Option (c) involves coating steel with zinc, which is more easily oxidized than iron, providing cathodic protection.
Option (d) involves attaching a strip of magnesium to steel, where magnesium is more easily oxidized than iron, also providing cathodic protection.
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Cathodic Protection
Cathodic protection is a technique used to prevent corrosion of metal surfaces, particularly in structures like pipelines and ships. It involves making the metal surface the cathode of an electrochemical cell, which reduces the oxidation process that leads to corrosion. This can be achieved through sacrificial anodes or impressed current systems.
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Lewis Dot Structures: Sigma & Pi Bonds
Sacrificial Anodes
Sacrificial anodes are metals that are more reactive than the metal they are protecting, such as zinc or magnesium. When attached to a structure like steel, these anodes corrode preferentially, thereby protecting the steel from oxidation. This method is commonly used in marine applications and underground pipelines.
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00:56Electrolytic Cell Components Example
Oxidation and Reduction
Oxidation and reduction are chemical processes that involve the transfer of electrons between substances. Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. In the context of cathodic protection, the metal being protected (like iron in steel) is reduced, preventing it from oxidizing and corroding.
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01:53Oxidation and Reduction Reactions
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Domanda del libro di testo
Which of the following describes the process of galvanization that protects steel from rusting?
(a) Steel is coated with a layer of paint.
(b) Iron in steel is oxidized to form a protective oxide coating.
(c) Steel is coated with zinc because zinc is more easily oxidized than iron.
(d) A strip of magnesium is attached to steel because the magnesium is more easily oxidized than iron.
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Domanda del libro di testo
Magnesium metal is produced by the electrolysis of molten magnesium chloride using inert electrodes.
(a) Sketch the cell, label the anode and cathode, indicate the sign of the electrodes, and show the direction of electron and ion flow.
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Domanda del libro di testo
How does the pH of the solution affect the formation of rust?
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Domanda del libro di testo
Which of the following metals can offer cathodic protec-tion to iron? Select all the correct choices. Mn, Ni, Pb, Sn, Al
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Domanda del libro di testo
Zinc is attached to a ship's steel propeller to prevent the steel from rusting. Write balanced equations for the corro-sion reactions that occur (a) in the presence of Zn and (b) in the absence of Zn.
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