Corrosion and redox reactions chem questions - HELP APPRECIATED QUESTION ONE - I
ID: 1059310 • Letter: C
Question
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
Magnesium metal could be used as a suitable coating for both galvanized and non-galvanized nails to protect both iron and zinc from corrosion.
As the reaction proceeds, Copper metal is deposited on the exposed surface of the nail.
Magnesium is oxidized from Mg(s) to Mg2+ when in contact with the Cu(NO3)2 solution
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.
NH3 (aq) + HCl (aq) NH4Cl (aq)
2AgOOCCH3 (aq) + Zn(s) Zn(OOCCH3)2 (aq) + 2Ag(s)
Au(s) + BrF3 (aq) + KF (aq) Br2 (l) + KAuF4 (aq)
Na2CO3 (aq) + H2SO4(aq) 2Na+ (aq) + SO42- (aq) + CO2 (g) + H2O (l)
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
The addition of sodium chloride is necessary for Cu(NO3)2 solution to corrode the zinc-plated galvanized nail
As the reaction proceeds, more zinc metal is deposited on the exposed surface of the nail.
Magnesium forms a physical barrier prevent the Cu(NO3)2 solution from coming into contact with the zinc-plated galvanized nail.
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
Iron- sacrificial electrode
Manganese- sacrificial electrode
Gold-sacrificial electrode
Copper - sacrificial electrode
PbSO4 - sacrificial electrode
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
Explanation / Answer
A ) False. Oxygen is the reducing agent.
B) In the cyanide ion, nitrogen is more electronegative. This means that nitrogen will have the -3 oxidation state. It forms a triple bond with carbon, and the extra 3 electrons from this bond gives it the oxidation state of -3.