Structure and properties quiz

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1. Explain why diamonds are very hard.

  • Every carbon atom is covalently bonded to 4 other carbon atoms in its structure.
  • Every carbon atom is ionic bonded to 4 other carbon atoms in its structure.
  • Every carbon atom is covalently bonded to 3 other carbon atoms in its structure.
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2. Explain what is meant by intermolecular forces.

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

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. 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.

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

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

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