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Metals

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    Metals Metals Presentation Transcript

    • Metals Describe metallic Know some explain why the properties of bonding bonding State advantages metals arrangement and disadvantages gives metals their of recycling properties Recall uses for iron, copper and aluminium
    • Properties Conduct electricity and heat  Malleable  Ductile  Hard  High melting and boiling points 
    • Iron Hard and tough  Used for car bodies 
    • Copper Good conductor of heat and electricity  Used for saucepan bottoms and wiring 
    • Aluminium Resistant to corrosion Low density Used for greenhouse frames and aeroplane bodies
    • Metallic Bonding In a piece of metal, all the atoms lose their  outer electrons to gain full shells, and become positive ions. These negative electrons move around between the metal ions. The negative electrons attract the positive ions, making the structure strong. Metals are good at conducting electricity and heat because of the free electrons which are able to move around.
    • Metallic Bonding + + + + + + - - - - - - + + + + + + - - - - - - + + + + + + - - - - - - + + + + + + - - - - - -
    • Recycling Advantages –  Saves money  Less damage to environment  Uses less energy  Less poisonous waste  Disadvantages-  Scrap metal must be collected  Metal must be sorted from other materials  Difficult if metals in small quantities  Depends on the public sorting their rubbish 
    • Alloys These are mixtures of two or more metals  E.g. brass, duralumin, solder  The properties are different from the base  metals
    • Complete the following sentences, using words from the box. a There are strong forces between ions, so metals are ____________________________ . b The electrons have a _______________ , and some of them can move, so metals _______________ electricity. c Rows of ions can move over each other, so metals are _______________ . d Some _______________ can move, so metals are good at _______________ heat. charge conduct conducting electrons malleable strong
    • Metals are used for many different things because they have useful properties. A malleable (can be hammered or bent into shape) B conduct electricity C conduct heat D strong For each of the uses below, write down the letter (or letters) of the properties that are useful. Sometimes there may be more than one useful property. For example, saucepans – C (saucepans are made of metal because metals conduct heat). a electrical wires __________________ b bridges ________________________ c radiators _______________________ d cars ___________________________