Rate of reaction

• What is the 'rate' of a chemical reaction?

  A measure of how quickly the reactants are converted into products.
• What is the formula for calculating the rate of a chemical reaction?

  rate = mass of product produced or lose divided by time taken

  rate= volume of product produced or lost divided by time taken
• What are the 3 different ways of measuring the rate of reaction?

  • Precipitation and colour change
  • change in mass
  • Volume of gas gained or lost
• How can precipitation and colour change be used to measure the rate of reaction?

  • Precipitation= measure the time it takes for a mark to disappear
  • Colour change= measure the time it takes for a colour change to occur.
  • In both cases calculate the rate using '1 divided by time taken'
• What are the 2 issues with measuring the rate of a reaction by observing colour change and precipitation?

  1. It is quite subjective because different people might interpret the exact point the solution changes colour differently.
  2. You can't use your results to plot a rate of reaction graph
• How can you calculate the rate of a reaction by measuring the change in mass?

  1. Use a balance to monitor how the mass changes over time
  2. Take measurements at regular intervals
  3. Plot your results on a graph
  4. Draw a tangent and calculate its gradient to find the rate at a particular time
• What is the most accurate way to measure the rate of a reaction and why?

  Change in mass because the balance scale is the most accurate measuring device.
• How can you use a gas syringe to measure the rate of a chemical reaction?

  1. Use the gas syringe to monitor how the volume of gas changes over time.
  2. Take measurements at regular intervals
  3. Plot your results on a graoh
  4. Draw a tangent and calculate its gradient to find the rate at a particular time