Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. Are most everyday metals pure or alloys?
   • Most metals in everyday use are alloys.
2. What are the alloys bronze and brass made up of?
   • Bronze is an alloy of copper and tin. Brass is an alloy of copper and zinc.
3. What is the percentage of gold in 24 carat and 18 carat gold used for jewellery?
   • The proportion of gold in the alloy is measured in carats. 24 carat being 100 % (pure gold), and 18 carat being 75 % gold.
4. What elements are present in the alloy steel?
   • Steels are alloys of iron that contain specific amounts of carbon and other metals.
5. How are the physical properties of high carbon and low carbon steels different?
   • High carbon steel is strong but brittle. Low carbon steel is softer and more easily shaped.
6. What are the benefits of stainless steels that contain chromium and nickel?
   • Steels containing chromium and nickel (stainless steels) are hard and resistant to corrosion.
7. What are the uses of low density aluminium alloys?
   • The uses of low density alloys can be for building bike frames and aeroplanes.
8. What are the uses of high density steels?
   • High density steels are used for building materials. Low density steels are used