Factors Affecting the Rate of Reaction

• 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?

  Activation energy
• What happens if particles collide with less energy than the activation energy?

  They bounce apart without reacting
• What two main factors determine the rate of a chemical reaction?

  Energy of particles and collision frequency
• How does increasing the energy of particles affect the rate of reaction?

  It increases the likelihood of surpassing activation energy
• What is the effect of increasing the frequency of collisions on the rate of reaction?

  It increases the number of successful collisions
• What happens to particles as temperature increases?

  Particles gain energy and move faster
• How does increased concentration affect the rate of reaction?

  It increases the number of particles per volume
• How does increased pressure affect the rate of reaction in gases?

  It increases the frequency of collisions
• What effect does higher surface area have on the rate of reaction?

  It increases the frequency of collisions
• How would using powdered magnesium affect a reaction with acid?

  It increases the rate of reaction
• What is a catalyst?

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

  They lower the activation energy required
• 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
• What is collision theory and its significance in chemical reactions?

  • States that particles must collide to react
  • Requires sufficient energy for successful collisions
  • Activation energy is the minimum energy needed
• How do temperature, concentration, pressure, and surface area affect reaction rates?

  • Increase energy of particles
  • Increase frequency of collisions
  • Lead to more successful collisions
• How do catalysts function in chemical reactions?

  • Speed up reactions without being consumed
  • Lower activation energy
  • Provide alternative reaction pathways