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Chapter 6, Lesson 4 Multimedia

Molecules Collide

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  • For molecules to react, they need to collide with enough energy.
  • If molecules hit with too little energy, they can just bounce off without reacting.
  • If they collide with enough energy, bonds can break and new bonds can form in a chemical reaction.


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  • The reactants just sit there until energy is added with the flame.
  • The added energy is enough to make molecules move fast enough to react.
  • The energy produced in the reaction is enough to keep the reactants breaking bonds and making new bonds. The demonstration shown in this video is very dangerous. Do not attempt to perform this demonstration.