Effect of Temperature on Rate of Chemical Reactions

Introduction to Collision Theory

• Collision Theory: Explains reaction rates.
  • Chemical reactions can only occur when reacting particles collide.
  • Collisions must have sufficient energy.
  • Rate of Reaction: Determined by the frequency of successful collisions (collisions per second).

Importance of Sufficient Energy

• Energy Requirement: Particles must collide with sufficient energy to react.
• Energy Profile: Shows energy changes during reactions.
  • Exothermic Reaction: Products have less energy than reactants; energy released to surroundings.
  • Activation Energy: Minimum energy required for successful collisions.
    • Critical concept in chemistry.
    • Will be discussed further in the context of catalysts.

Particle Energy and Collisions

• Energy Variation: Particles have differing amounts of energy.
  • Low-energy particles cannot overcome activation energy; no reaction.
  • High-energy particles can overcome activation energy; reaction occurs.

Effect of Temperature on Reaction Rate

• Increasing Temperature:
  • Raises particle energy.
  • Particles move faster, increasing collision frequency (more collisions per second).
  • Collisions have higher energy, enabling more particles to overcome activation energy.
• Proportional Relationship: Reaction rate increases with temperature.

Further Study and Practice

• Revision Workbook: Contains questions on the effect of temperature on reaction rate.
  • Available via the provided link.

By understanding these concepts, students should be able to describe how temperature affects chemical reaction rates.