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C2: Covalent bonding

Quiz by Oxford Revise Chemistry

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22 questions
Show answers
  • Q1
    How are covalent bonds formed?
    by the transfer of electrons
    by metals combining and sharing their delocalised electrons
    by atoms sharing electrons
    by the formation of ions
    60s
  • Q2
    Which type of atoms form covalent bonds between them?
    non-metals
    metal and a non-metal
    ions
    metals
    60s
  • Q3
    60s
  • Q4
    60s
  • Q5
    60s
  • Q6
    Describe the structure and bonding of a giant covalent substance.
    billions of ions electrostatically attracted to each other forming strong covalent bonds
    several atoms bonded together via electron exchange
    billions of atoms bonded together by strong covalent bonds
    a positive and negative ion are attracted to each other
    60s
  • Q7
    Small molecules consist of small numbers of atoms grouped together into molecules with ______ covalent bonds between the atoms and ______ intermolecular forces between the molecules.
    weak; metallic
    weak; strong
    strong; weak
    strong; ionic
    60s
  • Q8
    Many identical molecules joined together by strong covalent bonds in a long chain, with weak intermolecular forces between the chains forms a _______________.
    Users enter free text
    Type an Answer
    60s
  • Q9
    It takes a lot of energy to break the strong covalent bonds between the atoms, resulting in giant covalent substances having _________________.
    low boiling points
    high melting points
    high magnetic energy
    high electrostatic energy
    60s
  • Q10
    Only a small amount of energy is needed to break the weak intermolecular forces between simple molecules. What property does this give simple molecules?
    do not conduct electricity
    high melting points
    are brittle
    low melting points
    60s
  • Q11
    Why do large simple molecules have higher melting and boiling points than smaller simple molecules?
    the intermolecular forces are stronger between larger molecules
    the covalent forces are stronger in small molecules
    the ionic bonds are stronger in large molecules
    the intermolecular forces are weaker in large molecules
    60s
  • Q12
    Why do most covalent substances not conduct electricity?
    they are non-metals
    they do not have free electrons or delocalised ions
    they have shared electrons
    they do not have electrons
    60s
  • Q13
    How many carbon-carbon bonds does each carbon make in graphite?
    each carbon atom is bonded to two others
    each carbon atom is bonded to four others
    each carbon atom is bonded to five
    each carbon atom is bonded to three others
    60s
  • Q14
    Describe the structure of graphite.
    arranged in layers with delocalised electrons and weak forces between the layers
    arranged in layers with strong intermolecular forces between the sheets
    arranged in a strong lattice structure
    delocalised carbon atoms forming small molecules with weak intermolecular forces between them
    60s
  • Q15
    Why can graphite conduct electricity?
    the different layers can slide over each other carrying charge
    the delocalised electrons can move through the graphite
    it has free ions which can move
    the carbon layers carry electric current
    60s

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