Measuring and Calculating Rates of Reaction

• State the equation that could be used to calculate the mean rate of a reaction?

  Mean rate = change in y / change in x
• How would you measure the rate of reaction between two clear solutions, in which the product formed was a precipitate?

  Measure the rate of reaction by observing the time it takes for the precipitate to form and measuring the amount of precipitate formed over time.
• Explain why measuring a mass change during a reaction is an accurate method of measuring rate

  Because you can examine the amount of mass that has change during a tome
• Describe how you could investigate the effect of increasing HCl concentration on the rate of reaction between HCl and Mg

  1. Add set volume of dilute HCl to a conical flask and place of mass balance
  2. add Mg ribbon to the acid and quickly ply the flask with cotton wool
  3. Start stopwatch and record mass change at regular intervals
  4. plot results in graph
  5. repeat with more concentration of acid
• Describe how you could use a graph to find the mean rate of reaction between two points at a time?

  Tangent line
• What is a tangent?

  A line that touches a curve at a single point.
• How would you use a tangent to find the gradient of a curve at a particular point?


  Differentiation

  Change in y over change in x