Structure and properties quiz

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1. 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.
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2. 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.

3. Explain what is meant by intermolecular forces.

  • The forces between molecules.
  • The forces inside the molecule.

4. Why are compounds such as methane and ammonia, gases at room temperature?

  • They are made of small molecules
  • They are large molecules

5. 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.
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