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A bowl-shaped piece of rubber is dropped from a height of 5–10 cm and bounces a little as might be expected. It is then dropped from a height of 20–30 cm, and surprisingly bounces more than 100 cm into the air! This serves as an ideal model for the discussion of exothermic reactions and their activation energies.


  • Activation Energy
  • Exothermic Reactions
  • Kinetics
  • Potential Energy
  • Kinetic Energy