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Topic 10 Good Conductors of Heat Good Conductors of Electricity Shiny Malleable "can be shaped by hammering" Ductile "can be stretched into wires" Most of them have High Density except: Aluminum & Alkali Metals Most of them have High Melting & Boiling points except: Alkali Metals Physical Properties of Metals Chemical Properties of Metals During reactions, metals lose electrons forming positive ions. Metals above H in reactivity series react with acids forming salts and hydrogen gas Metals react with Oxygen forming “Basic Oxides” which can neutralise. Metal Use Properties Aluminium Manufacture of Aircrafts Low Density Strong Food Containers & Drinking Cans Resistant to Corrosion Overhead Electric Cables Low Density Ductile & Good Conductor of Electricity Uses of Metals

4 Pure Metals are Malleable? Alloys are harder and stronger than pure metals? Explain Why? Because metal atoms are regularly arranged in layers. The layers can slide over each other Because alloys have different sized atoms which disrupts the movement of particles so the layers can no longer slide over each other Rusting of Iron Rusting of Iron Corrosion is the gradual destruction due to chemical reaction with its surroundings Corrosion of Iron and steel has a special name: Rusting What’s Rusting? It is a chemical reaction between Iron & Oxygen in presence of water forming reddish brown layer on the surface of Iron called hydrated Iron (III) Oxide The Iron object gains weight after rusting What are the causes of rusting? The presence of BOTH Oxygen & Water. What are the factors that speed up rusting? Acids Salts High Temperature Topic 10