effect of surface area on rate

• What is the basis of collision theory in chemical reactions?

  Chemical reactions occur when reacting particles collide with sufficient energy
• How is the rate of a chemical reaction determined?

  By the frequency of successful collisions
• What does the term 'frequency' refer to in the context of chemical reactions?

  The number of successful collisions per second
• How does the surface area of a solid reactant affect the rate of a reaction?

  A greater surface area increases the number of collisions per second
• What happens to the particles in a solid reactant that are not on the surface?

  They cannot react with the particles in solution
• What is the effect of increasing the surface area of a solid reactant?

  It increases the rate of reaction
• What is the relationship between surface area to volume ratio and the rate of reaction?

  Smaller blocks have a greater surface area to volume ratio, leading to more collisions
• How can the effective surface area on the rate of reaction be investigated using marble chips?

  • Use marble chips (calcium carbonate) reacting with hydrochloric acid
  • Measure the volume of carbon dioxide produced
  • Change the surface area of the marble chips
• What is a challenge when measuring the volume of gas produced in a reaction?

  Bubbles can be produced rapidly, making measurements difficult
• What is a more accurate method for measuring gas volume in a reaction?

  Using a gas syringe
• How can the mass of carbon dioxide gas lost be measured in a reaction?

  • Place the reaction on a balance
  • Measure the mass decrease as carbon dioxide is produced
  • Calculate the rate of reaction from the mass loss
• What is the purpose of using cotton wool in the experimental setup?

  It allows carbon dioxide gas to escape while preventing acid from splashing out
• What could happen if acid splashes out of the flask during the experiment?

  It could cause the mass to fall more than it should, producing an anomalous result
• Where can students find questions on the effective surface area on the rate of reaction?

  In the vision workbook linked in the video
• What should you be able to describe after watching the video?

  The effective surface area of solid reactants on the rate of chemical reactions