Rates of reaction

• Rate of a chemical reaction

  How quickly reactants are turned into products
• 3 ways to measure rates

  Precipitation + Colour change

  Change in mass

  Volume of gas gained or lost
• Precipitation

  Measure the time it takes for a mark to disappear
• Colour change

  Measure the time it takes for a colour change to occur
• 2 issues with measuring using precipitation and colour change

  Subjective

  Cant use results to plot a graph
• Change in mass

  Use a balance to monitor how mass changes over time

  Take measurements at regular intervals

  Plot results on a graph

  Draw tangent to calculate gradient to find rate at certain time
• Most accurate

  Change in mass because scale is an accurate measuring device
• Gas syringe

  Use gas syringe to monitor how volume of gas changes over time

  Take measuremnts at regular intervals

  Plot results on graph and draw tangent to calculate the gradient