17.1 How to Measure Rate of Reactions

• What is Rate of Reactions?

  • how fast the reaction proceeds
• How to measure ROR in given amount of time?

  • how much product appears
  • how much reactant disappears
• Approach 1 - Measuring volume of gases produced at regular time intervals

  • gas syringe can be used
• Approach 2 - Measuring change in mass of reactants/products at regular time intervals

  • gas can escape - can measure change in mass - figure out ROR
• When mass of product is measured:

  • positive gradient
• When mass of reactants is measured:

  • negative gradient