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Worksheet: Making and Breaking Chemical Bonds

Q1:

Listed in the table are the energies of selected chemical bonds.

Bond C C C H H H N N O O
Energy (kJ/mol) 602 411 432 942 494

Which of these is the strongest bond?

  • A C C
  • B O O
  • C C H
  • D N N
  • E H H

Q2:

Hydrogen molecules ( H ) 2 have a single H H bond. This bond has an energy of 432 kJ/mol. What does this mean?

  • A 432 kJ of energy is required to break each H H bond.
  • B 432 kJ of energy is released when one mole of H H bonds is broken.
  • C 432 kJ of energy is released when one H H bond is broken.
  • D 432 kJ of energy is required to break one mole of H H bonds.
  • E 432 kJ of energy is required to form one mole of H H bonds.