Corrosion Questions: Chemistry Quiz!

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Corrosion Questions: Chemistry Quiz! - Quiz

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Questions and Answers
  • 1. 

    Corrosion is a chemical reaction that involves:

    • A.

      The inside of the object changing from an element to a compound

    • B.

      The surface of the object changing from an element to a compound

    • C.

      Nothing happens

    • D.

      The surface of the object changes from one element into another element.

    Correct Answer
    B. The surface of the object changing from an element to a compound
    Explanation
    For example, Iron metal changes from Fe --> Fe2+ ions

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  • 2. 

    Rusting is a special term, given to the corrosion of which metal?

    • A.

      Zinc

    • B.

      Copper

    • C.

      Nickel

    • D.

      Iron

    Correct Answer
    D. Iron
    Explanation
    Rusting is a special term given to the corrosion of iron because iron readily reacts with oxygen and water in the presence of air, leading to the formation of iron oxide, commonly known as rust. This process occurs when iron is exposed to moisture and oxygen over time, causing it to deteriorate and weaken. Zinc, copper, and nickel can also corrode, but the term "rusting" specifically refers to the corrosion of iron.

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  • 3. 

    What conditions are required for rusting to take place?

    • A.

      Water only

    • B.

      Oxygen only

    • C.

      Water and oxygen

    • D.

      Water and carbon dioxide

    Correct Answer
    C. Water and oxygen
    Explanation
    water and oxygen (from the air) are required for rusting.

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  • 4. 

    Ferroxyl indicator changes color in the presence of Fe2+ ions.

    • A.

      Stays yellow

    • B.

      Yellow --> Pink

    • C.

      Yellow --> Blue

    • D.

      Pink --> Yellow

    Correct Answer
    C. Yellow --> Blue
    Explanation
    Ferroxyl indicator turns blue in the presence of Fe2+ ions.

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  • 5. 

    Corrosion is an example of?

    Correct Answer
    oxidation
    Explanation
    Corrosion is an example of oxidation because it involves the reaction of a metal with oxygen in the presence of water or moisture. During corrosion, the metal atoms lose electrons and are oxidized, while oxygen gains electrons and is reduced. This process leads to the formation of metal oxides or hydroxides, causing the metal to deteriorate and weaken over time. Therefore, corrosion can be considered as a specific type of oxidation reaction that occurs specifically with metals.

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  • 6. 

    What effect does salt have on the rate of corrosion?

    • A.

      No effect

    • B.

      Speeds up corrosion

    • C.

      Slows down corrosion

    Correct Answer
    B. Speeds up corrosion
    Explanation
    Salt acts as an electrolyte and speeds up corrosion.

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  • 7. 

    Which of the following is not an example of physical protection?

    • A.

      Greasing

    • B.

      Painting

    • C.

      Attaching the metal to the negative terminal of a battery

    • D.

      Electroplating

    • E.

      Galvanising

    Correct Answer
    C. Attaching the metal to the negative terminal of a battery
    Explanation
    The other 2 types of physical protection are tin-plating and coating with plastic. Physical protection puts a layer between the metal and water/oxygen.

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  • 8. 

    Which of the following metals would protect iron by electrons flowing to the iron?

    • A.

      Magnesium

    • B.

      Silver

    • C.

      Tin

    • D.

      Copper

    Correct Answer
    A. Magnesium
    Explanation
    Magnesium is higher than iron in the electrochemical series. It will protect the iron by sacrificing itself to protect the iron. electrons will flow from Mg --> Fe

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  • 9. 

    When objects (gates) are galvanized, what metal is used to protect the iron.

    • A.

      Aluminium

    • B.

      Copper

    • C.

      Nickel

    • D.

      Zinc

    Correct Answer
    D. Zinc
    Explanation
    Galvanising is covering with a layer of zinc.

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  • 10. 

    What type of protection is galvanizing?

    • A.

      Physical protection

    • B.

      Sacrificial protection

    • C.

      Physical and sacrificial protection

    • D.

      None of the above.

    Correct Answer
    C. Physical and sacrificial protection
    Explanation
    Covering with a layer of zinc excludes water/oxygen - physical protection, Zinc is higher that iron in the Electrochemical series, so it will corrode to protect the iron (Sacrificial protection)

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  • 11. 

    Explain the effect of scratching a tin-plated (iron) object has on the rate of corrosion.

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