Q15. Which metal can be used as a sacrificial electrode to prevent the rusting of an iron pipe? a) Aub ) Ag c) Cu d) Mn
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Part A
Cathodic protection of iron involves using another more reactive metal as a sacrificial anode. Classify each of the following metals by whether they would or would not act as a sacrificial anode to iron.
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Reset Help Ag Mg Cu Pb Sn Zn Au Will act as sacrificial anode for iron Will not act as sacrificial anode for iron |
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Part B
An old iron beam was coated with an unknown metal. There is a crack on the coating and it is observed that the iron is rusting at the fracture. The beam is in a structure that experiences high stress, resulting in frequent fractures to the coating.
What was the old metal coating likely made of and what metal you would use to repair the fractures to avoid further corrosion?
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ResetHelp gold aluminum tin 1. The old coating was likely made of . 2. would be a good choice for repairing the fracture. |
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Corrosion and redox reactions chem questions - HELP APPRECIATED
QUESTION ONE - In the following chemical reaction, CaO is the reducing agent.
2Ca(s) + O2 (g) â 2CaO (s)
True
False
QUESTION TWO - What is the oxidation state of Nitrogen in K3Fe(CN)6 ?
QUESTION THREE - Identify the correct statement(s) with regards Zinc in Contact with Magnesium experiment
A. | Magnesium metal could be used as a suitable coating for both galvanized and non-galvanized nails to protect both iron and zinc from corrosion. | |||||||||||||||||||||||||||||||||||||||||||||||||
B. | As the reaction proceeds, Copper metal is deposited on the exposed surface of the nail. | |||||||||||||||||||||||||||||||||||||||||||||||||
C. | Magnesium is oxidized from Mg(s) to Mg2+ when in contact with the Cu(NO3)2 solution | |||||||||||||||||||||||||||||||||||||||||||||||||
D. | Aluminum metal cannot be used instead of magnesium to prevent corrosion of zinc under the same conditions. | |||||||||||||||||||||||||||||||||||||||||||||||||
E. Magnesium forms a physical barrier prevent the Cu(NO3)2 solution from coming into contact with the zinc-plated galvanized nail. QUESTION FOUR - Which of the following chemical equations correspond to redox reactions? Select all that apply.
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