Rate of reaction definition
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Transcript of Rate of reaction definition
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Rate of reaction definition
Rate of reaction is the change in concentration of any one reactant
or product in unit time
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Monitoring the rate of production of oxygen from hydrogen peroxide, using
manganese dioxide as catalyst
Monitor the rate by measuring the volume of oxygen evolved over time
H2O2 H2O O2+MnO22 2
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Procedure
Record the volume of gas in the syringe every
10 s until there is no increase in the volume of gas
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Procedure
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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
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VOLUME
GAS
cm3
TIME sec
Graph Volume Oxygen v Time
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VOLUME
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TIME sec
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VOLUME
GAS
cm3
TIME sec
What volume of gas was collected
after 30 s ?
120cm3
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VOLUME
GAS
cm3
TIME sec
When maximum
volume of oxygen
obtained
After what time was
the reaction finished ?
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VOLUME
GAS
cm3
TIME sec
When half maximum
volume of oxygen
obtained
When was the reaction half finished
?
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VOLUME
GAS
cm3
TIME
What was the instanteous
rate at 30 s ?
Y2=150
Y1=95
X2=50X1=10
Rate= Y2-Y1
X2-X1
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Rate= 150-95 50-10Rate= 55 40Rate= 1.375 cm3/sec
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VOLUME
GAS
cm3
TIME sec
How would the graph change if the solution as
more concentrated ?
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VOLUME
GAS
cm3
TIME
How would the graph change if the temperature
was higher ?
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