Rate of reaction definition Rate of reaction is the change in concentration of any one reactant or product in unit time

Monitor the rate by measuring the volume of oxygen evolved over time Monitoring the rate of production of oxygen from hydrogen peroxide, using manganese dioxide as catalyst 2 MnO2 O2 H2O2 H2O + Monitor the rate by measuring the volume of oxygen evolved over time

Procedure Record the volume of gas in the syringe every 10 s until there is no increase in the volume of gas

Procedure

How to start the Reaction and stopwatch at the same time Pull the thread to tilt test tube, and spill its contents. At the same time start the stopwatch

Graph Volume Oxygen v Time 160 V O L U M E G A S cm3 140 120 100 80 60 40 20 10 20 30 40 50 60 70 80 90 TIME sec

160 V O L U M E G A S cm3 140 120 100 80 60 40 20 10 20 30 40 50 60 70 80 90 TIME sec

What volume of gas was collected after 30 s ? 120cm3 160 V O L U M E G A S cm3 140 120 100 What volume of gas was collected after 30 s ? 80 60 40 20 10 20 30 40 50 60 70 80 90 TIME sec

When maximum volume of oxygen obtained 160 V O L U M E G A S cm3 140 120 After what time was the reaction finished ? 100 80 60 40 20 10 20 30 40 50 60 70 80 90 TIME sec

When half maximum volume of oxygen obtained 160 V O L U M E G A S cm3 140 120 When was the reaction half finished ? 100 80 60 40 20 10 20 30 40 50 60 70 80 90 TIME sec

What was the instanteous rate at 30 s ? 160 V O L U M E G A S cm3 Y2=150 140 120 Rate= Y2-Y1 X2-X1 What was the instanteous rate at 30 s ? 100 Y1=95 80 Rate= 55 40 Rate= 150-95 50-10 Rate= 1.375 cm3/sec 60 40 20 10 20 30 40 50 60 70 80 90 X1=10 X2=50 TIME

How would the graph change if the solution as more concentrated ? 160 V O L U M E G A S cm3 140 120 How would the graph change if the solution as more concentrated ? 100 80 60 40 20 10 20 30 40 50 60 70 80 90 TIME sec

How would the graph change if the temperature was higher ? 160 V O L U M E G A S cm3 140 120 How would the graph change if the temperature was higher ? 100 80 60 40 20 30 TIME