Structure and properties quiz

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1. Silver nanoparticles are used in socks to prevent bad smells. How are silver nanoparticles different to regular silver particles?

  • They are very small and have a smaller surface area.
  • They are very small and have a greater surface area.
  • They are very large and have a greater surface area.
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Other questions in this quiz

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

  • 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.
  • They look better than thermosoftening polymers.

3. Some dental braces are made from shape memory alloys. What is meant by a shape memory alloy?

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

4. 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.

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

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

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