Corrosion of Metals Quiz
19 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What happens to a substance that gains oxygen during a reaction?

  • It is corroded
  • It is reduced
  • It is oxidised (correct)
  • It is tarnished
  • During the reaction CuO + H2 → Cu + H2O, what happens to copper(II) oxide?

  • It undergoes corrosion
  • It loses oxygen and gets reduced (correct)
  • It undergoes tarnishing
  • It gains oxygen and gets oxidised
  • In the reaction ZnO + C → Zn + CO, what is the role of carbon (C)?

  • It undergoes rancidity
  • It undergoes tarnishing
  • It is reduced
  • It is oxidised (correct)
  • What happens to a substance that loses hydrogen during a reaction?

    <p>It is reduced</p> Signup and view all the answers

    In the reaction MnO2 + 4HCl → MnCl2 + 2H2O + Cl2, what happens to MnO2?

    <p>It loses oxygen and gets reduced</p> Signup and view all the answers

    Is magnesium being oxidised or reduced when it burns in air and changes into magnesium oxide?

    <p>Oxidised</p> Signup and view all the answers

    If a substance gains hydrogen during a reaction, what result does it lead to?

    <p>Reduction</p> Signup and view all the answers

    What does the reddish brown powder on iron articles signify?

    <p>Rusting</p> Signup and view all the answers

    What term is commonly used to describe the process of iron articles getting coated with a reddish brown powder over time?

    <p>Rusting</p> Signup and view all the answers

    What type of reaction occurs when milk is left at room temperature during summers?

    <p>Decomposition reaction</p> Signup and view all the answers

    Which type of reaction takes place when an iron tawa/pan/nail is exposed to humid atmosphere?

    <p>Oxidation reaction</p> Signup and view all the answers

    What type of reaction occurs when food gets digested in our body?

    <p>Hydrolysis reaction</p> Signup and view all the answers

    In the reaction MnO2 + 4HCl → MnCl2 + 2H2O + Cl2, what type of reaction is occurring?

    <p>Redox reaction</p> Signup and view all the answers

    What type of reaction happens when grapes get fermented?

    <p>Fermentation reaction</p> Signup and view all the answers

    When we respire, what type of chemical process is involved?

    <p>Oxidation reaction</p> Signup and view all the answers

    What happens when magnesium ribbon burns in air?

    <p>Magnesium undergoes combustion</p> Signup and view all the answers

    During the burning of magnesium ribbon, what is the ash formed known as?

    <p>Magnesium oxide</p> Signup and view all the answers

    Which type of change occurs when food is cooked?

    <p>Chemical change</p> Signup and view all the answers

    What type of reaction takes place when an iron tawa/pan/nail is exposed to humid atmosphere?

    <p>Oxidation-Reduction Reaction</p> Signup and view all the answers

    Study Notes

    Oxidation and Reduction Reactions

    • A substance gains oxygen during a reaction, it is said to be oxidised.
    • A substance loses oxygen during a reaction, it is said to be reduced.
    • Example: CuO + H2 → Cu + H2O, where CuO is reduced and H2 is oxidised.

    Examples of Redox Reactions

    • 2ZnO + C → 2Zn + CO, where C is oxidised and ZnO is reduced.
    • MnO2 + 4HCl → MnCl2 + 2H2O + Cl2, where HCl is oxidised and MnO2 is reduced.

    Corrosion

    • Corrosion occurs when a metal is attacked by substances around it, such as moisture, acids, etc.
    • Examples: rusting of iron, tarnishing of copper and silver.
    • Corrosion causes damage to car bodies, bridges, iron railings, ships, and other metal objects.

    Rancidity

    • Rancidity occurs when fats and oils are oxidised, changing their smell and taste.
    • Substances that prevent oxidation (antioxidants) are added to foods containing fats and oil to prevent rancidity.
    • Keeping food in air-tight containers helps to slow down oxidation.

    Types of Chemical Reactions

    • Combination reaction: a single product is formed from two or more reactants.
    • Example: CaO + H2O → Ca(OH)2, where calcium oxide reacts with water to form slaked lime.

    Exothermic and Endothermic Reactions

    • Exothermic reaction: a reaction that releases heat, increasing the temperature of the surroundings.
    • Endothermic reaction: a reaction that absorbs heat, decreasing the temperature of the surroundings.
    • Example of exothermic reaction: CaO + H2O → Ca(OH)2, where heat is released.

    Displacement and Double Displacement Reactions

    • Displacement reaction: a reaction in which one element displaces another from a compound.
    • Double displacement reaction: a reaction in which two compounds exchange partners.
    • Example of displacement reaction: Zn + CuSO4 → ZnSO4 + Cu, where zinc displaces copper.
    • Example of double displacement reaction: NaCl + AgNO3 → NaNO3 + AgCl, where sodium chloride reacts with silver nitrate.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge on the process of corrosion affecting metals like copper and silver. Learn about the black and green coatings formed on these metals, and the damage caused by corrosion to various objects such as car bodies, bridges, and ships.

    More Like This

    Types of Corrosion in Metals
    12 questions

    Types of Corrosion in Metals

    UserReplaceableCurl avatar
    UserReplaceableCurl
    Corrosion Prevention Methods Quiz
    18 questions
    Corrosion of Metals
    10 questions

    Corrosion of Metals

    SubsidizedHelium avatar
    SubsidizedHelium
    Corrosion of Metals
    6 questions
    Use Quizgecko on...
    Browser
    Browser