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Metals
 

Metals

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    Metals Metals Presentation Transcript

    • Metals explain why the bonding arrangement gives metals their properties
      • Describe metallic bonding
      • State advantages and disadvantages of recycling
      • Recall uses for iron, copper and aluminium
      Know some properties of metals
    • 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 ___________________________