Factors Affecting Rates of Reaction & Collision Theory

• What are the factors that affect the rate of chemical reactions?

  Temperature, concentration, pressure, surface area, catalyst
• What is the theory behind chemical reactions called?

  Collision theory
• What must particles do to react according to collision theory?

  Collide with sufficient energy
• What is the term for the minimum energy required for a reaction to occur?

  Activation energy
• How does the energy of particles affect the rate of reaction?

  More energy increases successful collisions
• What does the frequency of collisions refer to?

  How often particles collide with each other
• How do temperature increases affect particle movement?

  Particles move faster and collide more frequently
• What happens to the rate of reaction when temperature increases?

  It increases due to more successful collisions
• How are concentration and pressure related to the rate of reaction?

  Both increase the number of particles per volume
• What is the effect of higher surface area on the rate of reaction?

  It increases the frequency of collisions
• How would powdered magnesium react compared to a solid block of magnesium?

  Powdered magnesium reacts faster
• What is a catalyst?

  A substance that speeds up a reaction
• How do catalysts affect activation energy?

  They lower the activation energy
• What is the role of transition metals in catalysis?

  They often act as catalysts
• What are enzymes?

  Catalysts made by living organisms
• What are the main factors affecting the rate of chemical reactions?

  • Temperature
  • Concentration
  • Pressure
  • Surface area
  • Presence of a catalyst
• How do temperature, concentration, pressure, and surface area affect reaction rates?

  • Increase energy of particles
  • Increase frequency of collisions
  • Result in more successful collisions
• What is the significance of activation energy in chemical reactions?

  • Minimum energy for successful reactions
  • Determines the rate of reaction
  • Affected by catalysts
• How do catalysts function in chemical reactions?

  • Speed up reactions
  • Lower activation energy
  • Provide alternative reaction pathways