Covalent Bond

• What is the definition of a covalent bond? (1)

  -A shared pair of electrons
• What type of substances does covalent bonding occur between? (1)

  -Non-metal ions
• State the number of bonds the following atoms form: C,H,N,O,Cl (5)

  -C=4

  -H=1

  -N=3

  -O=2

  -Cl=1
• Describe the structure and bonding in CH4,O2,NH3 ect… (2)

  -Structure: Simple molecular

  -Bonding: covalent
• Why do simple covalent molecules have low boiling points? (2)

  -Weak intermolecular forces

  -Do not require a lot of energy to overcome?
• Why do diamond and graphite have high melting points? (3)


  -Both are giant covalent structures

  -Strong covalent bonds must be broken…

  -…Which requires a lot of energy
• Why is graphite soft? (3)

  -Structure: layers of carbon atoms

  -weak intermolecular forces between layers

  -layers can slide over each other
• Why can graphite conduct electricity?(3)

  -Earth carbon atom forms 3 bonds

  -It contains a sea of delocalised electrons

  -They can carry a charge through the structure