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  1. 1. Metals explain why the bonding arrangement gives metals their properties <ul><li>Describe metallic bonding </li></ul><ul><li>State advantages and disadvantages of recycling </li></ul><ul><li>Recall uses for iron, copper and aluminium </li></ul>Know some properties of metals
  2. 2. Properties <ul><li>Conduct electricity and heat </li></ul><ul><li>Malleable </li></ul><ul><li>Ductile </li></ul><ul><li>Hard </li></ul><ul><li>High melting and boiling points </li></ul>
  3. 3. Iron <ul><li>Hard and tough </li></ul><ul><li>Used for car bodies </li></ul>
  4. 4. Copper <ul><li>Good conductor of heat and electricity </li></ul><ul><li>Used for saucepan bottoms and wiring </li></ul>
  5. 5. Aluminium <ul><li>Resistant to corrosion </li></ul><ul><li>Low density </li></ul><ul><li>Used for greenhouse frames and aeroplane bodies </li></ul>
  6. 6. Metallic Bonding <ul><li>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. </li></ul>
  7. 7. Metallic Bonding
  8. 8. Recycling <ul><li>Advantages – </li></ul><ul><li>Saves money </li></ul><ul><li>Less damage to environment </li></ul><ul><li>Uses less energy </li></ul><ul><li>Less poisonous waste </li></ul><ul><li>Disadvantages- </li></ul><ul><li>Scrap metal must be collected </li></ul><ul><li>Metal must be sorted from other materials </li></ul><ul><li>Difficult if metals in small quantities </li></ul><ul><li>Depends on the public sorting their rubbish </li></ul>
  9. 9. Alloys <ul><li>These are mixtures of two or more metals </li></ul><ul><li>E.g. brass, duralumin, solder </li></ul><ul><li>The properties are different from the base metals </li></ul>
  10. 10. <ul><li>Complete the following sentences, using words from the box. </li></ul><ul><li>a There are strong forces between ions, so metals are ____________________________ . </li></ul><ul><li>b The electrons have a _______________ , and some of them can move, so metals </li></ul><ul><li>_______________ electricity. </li></ul><ul><li>c Rows of ions can move over each other, so metals are _______________ . </li></ul><ul><li>d Some _______________ can move, so metals are good at _______________ heat. </li></ul><ul><li>charge conduct conducting electrons malleable strong </li></ul>
  11. 11. <ul><li>Metals are used for many different things because they have useful properties. </li></ul><ul><li>A malleable (can be hammered or bent into shape) </li></ul><ul><li>B conduct electricity </li></ul><ul><li>C conduct heat </li></ul><ul><li>D strong </li></ul><ul><li>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. </li></ul><ul><li>For example, saucepans – C (saucepans are made of metal because metals conduct heat). </li></ul><ul><li>a electrical wires __________________ </li></ul><ul><li>b bridges ________________________ </li></ul><ul><li>c radiators _______________________ </li></ul><ul><li>d cars ___________________________ </li></ul>