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Gold

Gold. Gold. Copper. Silver. 24 karat gold 18 karat gold 14 karat gold. 24 / 24 atoms Au. 18 / 24 atoms Au. 14 / 24 atoms Au. Solid Brass. An alloy is a mixture of metals. Brass = Copper + Zinc Solid brass homogeneous mixture a substitutional alloy. Copper. Zinc.

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Gold

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  1. Gold Gold Copper Silver 24 karat gold 18 karat gold 14 karat gold 24/24atoms Au 18/24atoms Au 14/24atoms Au

  2. Solid Brass • An alloy is a mixture of metals. • Brass = Copper + Zinc • Solid brass • homogeneous mixture • a substitutional alloy Copper Zinc

  3. Brass = Copper + Zinc • Brass plated • heterogeneous mixture • Only brass on outside Brass Plated Copper Zinc

  4. Hardened Steel a interstitial alloy Steel Iron Carbon

  5. Tensile strength Force is added Steel Alloys • Stainless steel • Tungsten hardened steel • Vanadium steel • We can engineer properties • Add carbon to increase strength • Too much carbon  too brittle and snaps • Too little carbon  too ductile and iron bends

  6. Galvanized Nails and Screws • Zinc coating prevents rust • Use deck screws for any outdoor project • Iron will rust if untreated • Weaken and break

  7. Nitinol Wire • Alloy of nickel and titanium • Remembers shape when heated Applications: surgery, shirts that do not need to be ironed.

  8. Properties of Matter • Electrical Conductivity • Heat Conductivity • Density • Melting Point • Boiling Point • Malleability • Ductility

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