Structure and properties quiz

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1. 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.
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2. 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.

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

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

4. 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.

5. Polymers made from different monomers have different properties. Explain why.

  • The same monomers change the structure different monomers change the structure of the polymer chains.
  • Different monomers change the structure of the polymer chains because polymer chains are different shapes and sizes
  • different monomers change the structure of the polymer chains because polymer chains all are the same shape and size.

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