Metals

• What is a characteristic of metals related to appearance?

  Lustrous (shine)
• What property allows metals to be beaten and bent?

  Malleable
• What property allows metals to be stretched into wires?

  Ductile
• How does the density of metals compare to water?

  More dense than water
• What is a strength characteristic of metals?

  Strong
• What is the melting point characteristic of metals?

  High melting points (solids)
• What do metals conduct?

  Heat and electricity
• How do metals bond in terms of electrons?

  Donate electrons to form positive ions
• What is an alloy and its significance?

  • An alloy is a mixture of metals
  • New properties emerge when metals are mixed
• What are some examples of alloys and their uses?

  • Brass (Cu & Zn): Musical instruments, door handles
  • Bronze (Cu & Sn): Statues
  • Steel (Fe & C): Construction, ships
  • Solder (Pb & Sn): Connecting circuits
  • Alnico (Al, Ni & Co): Coins, magnets
• What is corrosion in metals?

  Undesired process converting metal to compound
• What is the corrosion of iron called?

  Rusting
• What causes rusting of iron?

  Exposure to O₂ and H₂O
• What is formed during rusting?

  Hydrated iron oxide
• What are methods to prevent rusting?

  • Coating in plastic
  • Painting
  • Greasing/oiling
  • Galvanising (coating in Zn)
  • Chrome plating (coating in Cr)
  • Alloying (adding Cr to steel)
• What is the Activity Series?

  List of metals in order of reactivity
• What does a more reactive metal do?

  Forms compounds more easily
• What are the most reactive metals in the Activity Series?

  • K
  • Na
  • Ca
  • Mg
  • Al
  • Zn
  • Fe
  • Pb
• What are the least reactive metals in the Activity Series?

  • Cu
  • Hg
  • Ag
  • Au