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 127
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.
Guida verificata passo dopo passo1
Identify the purpose of galvanization: to protect steel from rusting by preventing oxidation of iron.
Understand that galvanization involves coating steel with another metal that is more easily oxidized than iron.
Recognize that zinc is commonly used in galvanization because it is more reactive and will oxidize before iron does.
Consider the options: (a) involves paint, which is not galvanization; (b) involves iron oxidizing, which is not protective; (c) involves zinc, which matches the galvanization process; (d) involves magnesium, which is a different protection method called cathodic protection.
Conclude that the correct description of galvanization is option (c), where steel is coated with zinc because zinc is more easily oxidized than iron.
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Galvanization
Galvanization is a corrosion protection process where a protective layer of zinc is applied to steel or iron. This layer acts as a barrier to moisture and oxygen, which are necessary for rust formation. The zinc coating not only prevents direct contact with the environment but also serves as a sacrificial anode, meaning it will corrode before the underlying metal does.
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Percorso guidato
01:08
The Galvanic Cell
Sacrificial Anode
A sacrificial anode is a metal that is more reactive than the metal it protects, which in this case is zinc protecting steel. When exposed to corrosive environments, the sacrificial anode oxidizes preferentially, thereby preventing the oxidation of the more valuable metal. This principle is crucial in galvanization, as the zinc coating will corrode first, extending the life of the steel.
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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. In the context of galvanization, oxidation refers to the loss of electrons by zinc as it corrodes, while reduction involves the gain of electrons by iron in steel, which helps to prevent its oxidation. Understanding these processes is essential for grasping how galvanization effectively protects steel from rusting.
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01:53Oxidation and Reduction Reactions
Pratica correlata
Domanda del libro di testo
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.
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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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1
rank
Domanda del libro di testo
A mercury battery uses the following electrode half-reactions: (b) Calculate ∆G° (in kilojoules) and K at 25 °C for the cell reaction.
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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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