Structure and properties quiz

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1. What is a fullerene?

  • Forms of carbon, with large molecules with hexagon cage like structures.
  • A type of element used to give a molecule strong forces.
  • A chemical used to transfer drugs into the body,
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2. Some dental braces are made from shape memory alloys. What is meant by a shape memory alloy?

  • A substance which is a mixture of metals that can be meant/ deformed and changes back into its original shape when heated
  • A substance which is a mixture of metals that can be meant/ deformed and changes back into its original shape when cooled.
  • A pure metal that can be meant/ deformed and changes back into its original shape when heated

3. Why does it take a lot of energy to melt sodium chloride?

  • It is a giant ionic structure with strong electrostatic forces which means more energy is needed to break up these forces
  • It is a giant ionic structure with weak electrostatic forces which means less energy is needed to break up these forces
  • It is a giant covalent structure with strong electrostatic forces which means more enrgy is needed to break up these forces

4. Why can graphite conduct electricity?

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

5. 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.

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