5.1.1 how fast?

• What is the order of a chemical reaction?


  A measure of the number of reactant molecules that must collide for the reaction to occur
• What does the rate constant (k) depend on?

  The specific reaction, temperature, and other conditions
• What type of reaction is independent of reactant concentrations?

  A zero-order reaction
• What type of reaction is directly proportional to the concentration of a single reactant?

  A first-order reaction
• What type of reaction is directly proportional to the product of the concentrations of two reactants?

  A second-order reaction
• What is an integrated rate law?


  An equation that describes the concentration of a reactant or product as a function of time, given the rate law and the initial concentrations
• What is half-life?

  The time required for the concentration of a reactant to decrease by half
• What is the formula for calculating half-life?

  ln(2) / k, where k is the rate constant
• What is activation energy?

  The minimum energy required for a reaction to occur
• What is a catalyst?

  A substance that speeds up a reaction without being consumed or altered in the process
• What effect does a catalyst have on a reaction?

  It reduces the activation energy required for the reaction to occur, allowing it to occur faster and more efficiently
• What is an enzyme?


  A biological catalyst that speeds up a specific chemical reaction
• What is Michaelis-Menten kinetics?


  A mathematical model that describes the behavior of enzymes and their substrates
• What does the Michaelis-Menten model describe?

  The enzyme-substrate complex formation and the subsequent reaction rate
• What is competitive inhibition?


  A type of inhibition where the inhibitor binds to the active site of the enzyme, preventing the substrate from binding
• What is non-competitive inhibition?

  A type of inhibition where the inhibitor binds to a site other than the active site of the enzyme, altering the enzyme's conformation and reducing its activity
• Who is the presenter of the video on OCR-A module 5?


  Chris Harris
• What is the main focus of the video presented by Chris Harris?

  The video focuses on revision notes for the OCR-A module 5 topic on reaction rates.
• Why is it important to practice exam questions in addition to knowing the content?

  Practicing exam questions helps in applying the content effectively.
• Where can students purchase the slides mentioned in the video?

  Students can purchase the slides by clicking the link in the comments box below the video.
• What is the purpose of the videos available on the Alawis Chemistry YouTube channel?

  The videos are designed to supplement students' revision for various exam boards.
• What is one method mentioned for measuring the rate of a reaction?

  Measuring the change in pH of a reaction.
• Why is a pH meter useful in measuring reaction progress?

  A pH meter can measure the pH of a substance at regular intervals during the reaction.
• How can mass loss be used to measure the rate of a reaction?


  By placing the reaction on a top pan balance and measuring the reduction in mass as gas escapes.
• What is the significance of mole calculations in measuring reaction rates?

  Mole calculations help determine the number of moles of gas produced in a reaction.
• What is another method for measuring the rate of a reaction involving gas production?

  Using a gas syringe to measure the volume of gas produced over time.
• What should be considered when setting up a gas syringe for measuring gas production?

  Ensure that the reagents are not too concentrated to avoid excessive gas production.
• How can the ideal gas equation be used in measuring reaction rates?


  It can be used to calculate the number of moles of gas produced during the reaction.
• What is a colorimeter used for in measuring reaction rates?

  A colorimeter measures the absorptivity of light in a colored sample.
• In which field is a colorimeter particularly useful?

  Environmental sciences, for measuring water quality.
• What is the common reaction mentioned that can be monitored using a colorimeter?

  The reaction between propanone and iodine.
• How does the concentration of iodine affect the absorbance measured by a colorimeter?

  As the concentration of iodine increases, the absorbance also increases.
• How can a calibration curve be used in measuring unknown concentrations?

  A calibration curve allows us to measure the absorbance of an unknown sample and determine its concentration.
• What is the definition of the rate of a reaction?

  The rate of a reaction is the speed at which a reactant is destroyed or the speed at which a product is formed.
• How is the rate of reaction calculated?

  Rate of reaction = [Change of concentration of reactant/product] / Time
• What are the units of Rate of Reaction?

  The units of Rate of Reaction are mol dm^-3s^-1.
• What is the misconception about the effect of doubling the concentration of a reactant on the rate of reaction?

  Doubling the concentration of a reactant does not always double the rate of reaction.
• How can the order of a reaction be determined with respect to a reactant?

  The order of a reaction can be determined experimentally by observing the effect of changing the concentration of the reactant on the rate of reaction.
• What does it mean if a reaction is Zero Order with respect to a reactant?

  If a reaction is Zero Order with respect to a reactant, it means that changing the concentration of that reactant has no effect on the rate of the reaction.
• What does it mean if a reaction is First Order with respect to a reactant?

  If a reaction is First Order with respect to a reactant, doubling the concentration of that reactant will double the rate of the reaction.