Lesson Worksheet: Corrosion Chemistry • 10th Grade
In this worksheet, we will practice describing methods for the prevention of rusting of iron and identifying metals less susceptible to oxide formation.
Q1:
The Statue of Liberty in New York City contains a copper skin wrapped around iron supports. Why is this design problematic?
- ACopper is less reactive than iron, so it accelerates rusting of the iron support.
- BCopper cannot form an alloy with iron, so the iron support is exposed to rusting.
- CCopper develops a thick oxide layer, preventing it from acting as a sacrificial coating for the iron support.
- DCopper binds water more strongly than iron, so it accelerates rusting of the iron support.
- ECopper has a low tensile strength so it cracks easily, exposing the iron support to rusting.
Q2:
Which of the following is not a method for lowering the rate of rusting?
- AWelding
- BGreasing
- CAlloying
- DGalvanization
- EElectroplating
Q3:
Vehicle components are sometimes made of aluminum instead of steel in order to reduce the risk of oxidation.
Why is aluminum less susceptible than steel to oxidation?
- AAluminum binds water less strongly than steel.
- BAluminum is less reactive than steel.
- CAluminum forms cracks less easily than steel.
- DAluminum is protected by an unreactive oxide layer.
- EAluminum is protected by an unreactive carbonate layer.
Which of the following is another advantage of using aluminum instead of steel in vehicle components?
- AAluminum is less expensive than steel.
- BAluminum is stronger than steel, so it deforms less easily.
- CAluminum is less dense than steel.
- DAluminum is harder than steel, so it scratches less easily.
- EAluminum has a higher melting point than steel.
Q4:
Iron may be protected from rusting by supplying the metal with an electric current. Why does this method lower the risk of rusting?
- AThe supply of electrons promotes the formation of a protective surface oxide layer.
- BThe supply of electrons converts iron ions back to metallic iron.
- CThe supply of electrons causes the iron surface to become charged, binding oxygen molecules less strongly.
- DThe supply of electrons converts oxygen to water, preventing it from acting as an oxidant.
- EThe supply of electrons causes the iron surface to become charged, binding protective surface oxides more strongly.
Q5:
An iron surface is protected from rusting by coating it with a sacrificial metal from a salt solution. Which process is responsible for the formation of the protective layer?
- AReduction of dissolved metal ions by an electric current
- BReaction of dissolved metal ions with surface iron oxides
- CReaction of dissolved metal ions with the iron surface
- DReaction of dissolved metal ions with atmospheric oxygen
- EOxidation of dissolved metal ions by an electric current
Q6:
Which of the following is not a useful property in sacrificial metal coatings for steel objects?
- AHigh melting point
- BLow reactivity
- CHigh tensile strength
- DLow density
- EHigh hydrophobicity
Q7:
What is the main reason for preferring oil over plastic as a protective coating for a steel bicycle chain?
- AOil is less likely to react with the steel chain.
- BOil can spread to maintain a uniform coating during movement of the chain.
- COil is less heavy than plastic so is less likely to impede the chain movement.
- DThe oil layer reduces oxidation by acting as a sacrificial coating.
- EOil is less expensive than a plastic coating.
Q8:
A steel vehicle is protected from rusting by coating the exposed surface with a second metal.
What name is given to this process?
- AGalvanization
- BPassivation
- CAlloying
- DPainting
- EElectroplating
What name is given to the protective metal layer?
- ASacrificial anode
- BPassivating layer
- CAlloy
- DElectrical insulation
- ESacrificial cathode
Q9:
Which of the following is the best definition of galvanic corrosion?
- AOxidation of a metal accelerated by alloying
- BReduction of a metal accelerated by the presence of a less reactive metal
- COxidation of a metal accelerated by the presence of a more reactive metal
- DReduction of a metal accelerated by alloying
- EOxidation of a metal accelerated by the presence of a less reactive metal
Q10:
Which of the following is the best definition of passivation?
- AProtection of a metal surface by an unreactive oil layer
- BProtection of a metal surface by an electrical current
- CProtection of a metal surface by an unreactive plastic layer
- DProtection of a metal surface by an unreactive oxide layer
- EProtection of a metal surface by a sacrificial material
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