Structure and properties quiz

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1. Explain why diamonds are very hard.

  • Every carbon atom is covalently bonded to 3 other carbon atoms in its structure.
  • 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.
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2. 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.

3. Explain what is meant by intermolecular forces.

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

4. 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

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

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

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