Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
METALS Examples: iron, steel and brass Sources: metal ores in Earth’s crust 1 Plastics • Examples: nylon and polystyrene • Source: crude oil 2 Ceramics • Examples: china,bricks and pots • Sources: clay, sand and other materials 3 Glass • Examples of glass: pyrex, lead and crystal • The sources of glass are: limestone and other materials 4 FIBERS • Examples of materials: cotton, wool and polyestere The sources of fibers are: plants and animals 5 FEATURES: THE MATERIALS 1) Number of materials 2) Factors of elements: Properties,the mass,any climatic,chemical and machining requirement 3) There is a better material for each situation. 4) MATERIALS ARE FROM THE ELEMENTS! 6 4 EXAMPLE OF ALL ELEMENTS ALKALI METALS ALKALINE HEART METALS Sodium Radium calcium, barium and other… NON-METALS Arsenic OTHER MATERIALS Sulfur oxygen, nitrogen and other… Aluminium Tungsten Strontium Hydrogen lithium, potassium and other… TRANSITIONA L METALS Lead Cobalt chromium, manganese and other… Bismuth, polinium and other… NOBLE GASES Elium Xenon Radon, krypton and other… 7 The ATOM Nucleus Electrons Neutrons Protons 8 Metals and Non-Metals APPEARANCE METALS NON-METALS Shiny, ductile, malleable Non metals are dull. They are neither ductile, nor malleable MELTING AND Usually higher than nonBOILING POINTS HEAT CONDUCTIVITY metals Usually lower than metals, many are gases Good conductor of heat Poor conductors of heat SPECIFIC WEIGHT Heavier than non-metals CONDUCTORS OF ELECTRICITY Good conductors Lighter than metals Poor conductors 9 ALUMINIUM 10 IT’S USED IN… RESISTANT MATERIAL LEAD LEAD IS RESISTANT TO OXIDATION,IT HAS BEEN WIDELY USED IN THE PAST FOR ROOFING AND WATER PIPES;IT HAS A LOW MELTING POINT COMMON METAL IT IS A SHIELD AGAINST RADIATION AND IS A POOR CONDUCTOR OF ELECTRICITY AND RESISTS CORROSION BY ACIDS IN BATTERIES,GLASS CERAMICS AND VARIOUS ALLOYS SUCH AS PEWTER AND SOLDER CHARACTERISTICS THE LEAD IS RESISTANT TO OXIDATION,IT HAS BEEN WIDELY USED IN THE PAST FOR ROOFING AND WATER PIPES;IT HAS A LOW MELTING POINT >COPPER< - ORANGE-PINK VERY MALLEABLE DUCTILE COPPER AGE BRASS Brass is an alloy Brass consists of copper mixed with zinc Rubbers -Applications -Elastic properties -Designers TOOLS SAW Saw is used to cut wood or metals the handle is made up of wood/plastic while the upper part of steel HAMMER It Is used to hammer nails The handle is made of wood/plastic while the upper part is made of iron and steel DRILL It is used to make holes The drill is made up of plastic and the drill bit of steel SPANNER It is used to loosen nuts It is made up of steel PLIERS It is used to bend wires The handle is made up of plastic or rubber while the upper part is made of steel SCREWDRIVER It is used to screw and unscrew The handle is made up of plastic or rubber while the upper part is made of steel Grazie • I nostri ringraziamenti vanno: » Al D.S. Prof. Marzagalli » Alla Prof.ssa Parini, Alla Prof.ssa Crepaldi » Al Prof. Cacciato » Alla 2 ATER.