Using Resources

    Cards (21)

    • What is the purpose of damp mineral wool in the apparatus used to react metals with steam?
      To generate steam upon heating
    • What gas is produced when metals react with steam?
      Hydrogen
    • What are the characteristics of ceramics?
      • Hard
      • Brittle
      • Heat-resistant
      • Corrosion-resistant
    • What is a composite material?
      • Consists of two or more materials
      • Different properties combined
      • Produces desirable properties
    • What are the two components of a composite material called?
      Reinforcement and matrix
    • What are the properties of polymers?
      • Flexible
      • Easily shaped
      • Good insulators of heat and electricity
    • How do thermosoftening polymers behave when heated?
      • Made from many polymer chains
      • Weak intermolecular forces
      • Melt and can be remoulded
    • How do thermosetting polymers differ from thermosoftening polymers?
      • Strong covalent bonds
      • Do not soften when heated
      • Hard, strong, and rigid
    • What are the properties of metals?
      Malleable, ductile, good conductors
    • How do alloys compare to regular metals?
      Alloys are much stronger and not malleable
    • What is corrosion?
      Metals breaking down by reacting with substances
    • What are barrier methods to prevent iron from rusting?
      • Paint it (for big structures)
      • Oil or grease it (for moving parts)
      • Electroplating (thin layer of another metal)
    • What are sacrificial methods for preventing iron from rusting?
      • Add a more reactive metal
      • E.g., aluminum or zinc
      • More reactive metal oxidizes instead
    • What is galvanizing?
      Coating iron with zinc for protection
    • What is the chemical equation for rusting?
      Iron + oxygen + water -> hydrated iron (III) oxide
    • What is the rusting half equation for iron?
      Fe -> Fe3+^{3+} + 3e^{-}
    • What is the rusting half equation for oxygen?
      O2_{2} + 4e^{-} -> 2O2^{2-}
    • How does aluminum oxide protect against corrosion?
      Forms a protective layer preventing oxidation
    • How can we change the properties of a polymer?
      • Change reaction temperature
      • Change reaction pressure
      • Change the catalyst
    • Why do thermosetting polymers not melt when heated?
      • Strong crosslinks between chains
      • Require lots of energy to break
    • What are the limitations of life cycle assessments (LCAs)?
      • Difficult to gather all required data
      • Companies can manipulate LCAs
      • Hard to compare different harms
    See similar decks