Properties of covalent structures

Cards (21)

  • What type of bond do non-metals form by sharing electrons?
    Covalent bonds
  • What is the result of non-metals joining by covalent bonds?
    Atoms have full outer shells
  • What are small molecules formed by non-metals called?
    Simple molecular substances
  • What is a key property of covalent bonds?
    They are very strong
  • What must happen to break covalent bonds in simple molecular substances?
    A lot of energy is needed
  • What forces need to be broken to melt or boil chlorine?
    Weak intermolecular forces
  • At what temperature does chlorine boil?
    -34 degrees Celsius
  • How do intermolecular forces affect boiling points?
    More forces mean higher boiling points
  • What is the boiling point of bromine?
    59 degrees Celsius
  • What is the boiling point of iodine?
    184 degrees Celsius
  • Why do simple molecular substances not conduct electricity?
    They have no free electrons
  • What are giant covalent structures made of?
    Huge numbers of non-metal atoms
  • How are atoms arranged in giant covalent structures?
    In regular repeating lattices
  • What is silicon dioxide also known as?
    Silica
  • What is the ratio of silicon to oxygen in silicon dioxide?
    1 to 2
  • What is a key property of giant covalent structures?
    They have high melting and boiling points
  • Why do giant covalent structures not conduct electricity?
    They don't contain charged particles
  • What is an exception to the conductivity of giant covalent structures?
    Graphite conducts electricity
  • What are the main components of silicon dioxide?
    Silicon and oxygen atoms
  • What are the differences between simple molecular substances and giant covalent structures?
    • Simple molecular substances:
    • Small molecules
    • Weak intermolecular forces
    • Low melting and boiling points
    • Do not conduct electricity

    • Giant covalent structures:
    • Large networks of atoms
    • Strong covalent bonds
    • High melting and boiling points
    • Generally do not conduct electricity
  • What is the key takeaway regarding simple molecular substances and giant covalent structures?
    Simple molecules are weakly bonded; giants are strong