KA 1: Rates of Reaction

• What is chemistry primarily the study of?


  Study of matter
• What occurs during chemical reactions?

  Particles combine, split, or both
• What is a chemical reaction essentially about?

  Particles colliding and causing change
• What effect does an increase in temperature have on reaction rates?

  Increases kinetic energy and collision frequency
• What happens to particles when temperature increases?

  They move faster
• How does concentration affect reaction rates?

  Higher concentration increases reaction speed
• What is the effect of decreasing particle size on reaction rates?

  Increases the rate due to larger surface area
• What is a catalyst?

  Speeds up reactions without being used up
• What can be recovered at the end of a reaction?

  Catalysts
• What is the catalyst in the Haber Process?

  Iron
• What is the catalyst in the Ostwald Process?

  Platinum
• What are biological catalysts called?

  Enzymes
• How is reaction rate calculated?

  Rate = change in quantity / change in time
• What can the quantity in the reaction rate formula represent?

  Mass, concentration, volume, etc.
• What do lines A and B in the graph represent?

  Same reaction at different rates
• What factors can increase the rate of reaction?

  • Increase temperature
  • Increase concentration
  • Decrease particle size
  • Add a catalyst
• Why does increasing temperature affect reaction rate?

  It increases particle movement and collisions
• Why does increasing concentration speed up reactions?

  More reactants lead to more collisions
• Why does decreasing particle size increase reaction rate?

  It increases surface area for collisions
• What is the role of enzymes in chemical reactions?

  They regulate reactions in the body
• How can you determine relative reaction rates from graphs?

  By comparing the slopes of the lines
• What are the key points to remember about catalysts?

  • Speed up reactions
  • Not used up in reactions
  • Can be recovered after reactions
• What should you be able to explain regarding factors affecting reaction rates?

  • Why temperature affects rate
  • Why concentration affects rate
  • Why particle size affects rate
  • Role of catalysts in reactions