Factors Affecting Rates of Reactions

• What does the rate of a chemical reaction depend on?

  Collision frequency and collision energy
• How does collision frequency affect the rate of reaction?

  More collisions increase the reaction rate
• What happens to the rate of reaction if collision frequency is doubled?

  The rate of reaction also doubles
• What is required for a collision to initiate a chemical reaction?

  Enough energy to overcome activation energy
• What effect does increasing pressure or concentration have on reaction rates?

  It increases the frequency of collisions
• How does surface area influence the rate of reaction?

  More surface area leads to more frequent collisions
• What is the role of catalysts in chemical reactions?

  They speed up reactions without being used up
• How do catalysts affect activation energy?

  They lower the activation energy required
• What are enzymes in the context of chemical reactions?

  Biological catalysts that speed up reactions
• What factors affect the rate of chemical reactions?

  • Collision frequency
  • Collision energy
  • Pressure or concentration
  • Surface area
  • Catalysts
• What is the relationship between pressure/concentration and reaction rates?

  • Low pressure/concentration = slow rate
  • High pressure/concentration = fast rate
• How does surface area affect reaction rates?

  • More surface area = more frequent collisions
  • Less surface area = fewer collisions
• What is the effect of catalysts on reaction pathways?

  • Provide an alternative pathway
  • Lower activation energy
• What is the significance of activation energy in reactions?

  • Minimum energy needed to start a reaction
• What is the effect of temperature on reaction rates?

  • Higher temperature = faster reaction rate
  • Lower temperature = slower reaction rate
• What happens to the rate of reaction when cooling occurs?

  • Rate of reaction decreases
• What is meant by a reversible reaction?

  • A reaction that can proceed in both directions
• What is equilibrium in a chemical system?

  • The state where reactants and products are balanced
• How does the presence of more products affect a reversible reaction?

  • It can shift the equilibrium position