Structure and properties quiz

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1. Explain why a block of copper can be hammered into a sheet.

  • The atoms are in layers and these layers can slide over each other into the new shape.
  • Because copper isn't very strong.
  • Copper breaks when a force is applied.
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2. Explain how the atoms in a metal are bonded together.

  • The outer electrons delocalise leaving a lattice of positive ions. The delocalised electrons strongly attract the positive ions and hold them in position.
  • The outer electrons delocalise leaving a lattice of positive ions. The delocalised electrons strongly attract the negative ions and hold them in position.

3. Explain why thermosetting polymers are used to make handles for cooking pans.

  • They look better than thermosoftening polymers.
  • They do not soften when they get hot. Good insulators of hot. Can be molded into shapes then become rigid when cooled.
  • They mold better than thermosoftening polymers.

4. Silver nanoparticles are used in socks to prevent bad smells. Suggest why the manufacturers used nanoparticles instead of regular silver particles.

  • They are more effective and cheaper.
  • They are better looking and more effective.
  • They keep the socks intact for longer.

5. Why can graphite conduct electricity?

  • The delocalised electrons in graphite carries the charge.
  • Because it has weak intermolecular forces.
  • Because its silver.

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