Pure metals and alloys 
       •   All metals fall into two categories. They can either be pure metals or 
           alloys.
       •   A pure metal consists of a single element, which means that it is a 
           metal only having one type of atom in it. The most commonly used pure 
           metals are aluminium, copper, iron, lead, zinc, tin, silver and gold.
       •   An alloy is a mixture of two or more pure elements. Pure metals 
           sometimes lack certain required properties. To create these properties a 
           number of these pure metals are combined together.
       •   Pure aluminium is rarely used because it is too soft. It is normally mixed 
           with other metals, which produce aluminium alloys that are even 
           stronger than mild steel, are resistant to corrosion but still retain the 
           lightness of aluminium.
                                                        
                        Name the metals?
                                          •  Mild steel. It is used for general 
                                             structural work for example 
                                             girders, nuts, bolts, screws, car 
                                             body panels and non-cutting tools.
                                          •  If mild steel is coated in tin it is 
                                             called ‘Tin plate’.
                                          •  If mild steel is coated in zinc it is 
                                             called ‘Galvanised sheet’.
                                          •  If mild steel is coated in lead it is 
                                             called ‘Terne sheet’.
                                                 
                       Name the metals?
                                            •   Aluminium. It is used to 
                                                make car bodies, cooking 
                                                utensils, engine cylinder 
                                                heads, window frames, 
                                                insulation, foil food wrapping 
                                                and boats.
                                            •   It is mixed with copper to 
                                                make an alloy. This alloy is 
                                                much stronger than pure 
     Name the metal being poured?               aluminium.
     To give you a clue it is used to make 
     window frames and aircraft.            •   Duralumin is used to make 
                                                parts of aircraft.
                                              
                 Name the metals?
                                      Medium carbon 
                                     steel. It is used to 
                                     also make garden 
                                     tools, axles and 
                                     shafts. 
         Name the metal used to make 
         the rear sprocket on this bike? 
                                  
                 Name the metals?
                                   • High Carbon Steel. It 
                                     is used to make hand 
                                     tools, chisels and 
                                     punches. It is also 
                                     called tool steel. 
          Name the metal used to 
          make this centre punch?