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18 Sep 2018

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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19 Sep 2018
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Related questions

A piece of magnesium can be attached to the iron hull of a boat to prevent it from rusting.

Why is the magnesium called a sacrificial metal?

How does the Mg keep the iron hull from rusting?

Which can be thought of as the positive cathode, the Mg or the steel hull? Explain.

Putting a block of Mg on a steel boat hull does not create a battery. Why not?

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.

Drag each item to the appropriate bin.

View Available Hint(s)

Reset

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Ag

Mg

Cu

Pb

Sn

Zn

Au

Will act as sacrificial anode for iron

Will not act as sacrificial anode for iron

Submit

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?

Drag each label to the appropriate target.

View Available Hint(s)

ResetHelp

gold

aluminum

tin

1. The old coating was likely made of .

2. would be a good choice for repairing the fracture.

Submit

Corrosion and redox reactions chem questions - HELP APPRECIATED

QUESTION ONE - In the following chemical reaction, CaO is the reducing agent.

2Ca(s) + O2 (g) → 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.

A.

NH3 (aq) + HCl (aq) → NH4Cl (aq)
B.

2AgOOCCH3 (aq) + Zn(s) → Zn(OOCCH3)2 (aq) + 2Ag(s)
C.

Au(s) + BrF3 (aq) + KF (aq) → Br2 (l) + KAuF4 (aq)
D.

Na2CO3 (aq) + H2SO4(aq) → 2Na+ (aq) + SO42- (aq) + CO2 (g) + H2O (l)
E.

KNO3 (aq) + NaOH (aq) → KOH (aq) + NaNO3 (aq)

QUESTION FIVE -

Identify the correct statement(s) with regards to the last part of Experiment 6: Zinc in Contact with Magnesium

A.

The addition of sodium chloride is necessary for Cu(NO3)2 solution to corrode the zinc-plated galvanized nail
B.

As the reaction proceeds, more zinc metal is deposited on the exposed surface of the nail.
C.

Magnesium forms a physical barrier prevent the Cu(NO3)2 solution from coming into contact with the zinc-plated galvanized nail.
D.

Magnesium is oxidized from Mg(s) to Mg2+ when in contact with the Cu(NO3)2 solution

Magnesium metal is able to shuttle electrons easily to the zinc, thereby reducing the amount of zinc undergoing corrosion from the Cu(NO3)2 solution

QUESTION SIX - Make three matches with the following metals and a substance that may act as a suitable sacrificial electrode. All three metals have unique choices, you CANNOT reuse choices (for Example: if you pair Nickel metal with A- you cannot use A again for another metal)

Nickel metal

Iron metal

Silver metal
A.

Iron- sacrificial electrode
B.

Manganese- sacrificial electrode
C.

Gold-sacrificial electrode
D.

Copper - sacrificial electrode
E.

PbSO4 - sacrificial electrode

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