Factors affecting Rate of reaction 1 Concentration 2

Factors affecting Rate of reaction 1. Concentration 2. Temperature 3. Particle size 4. Nature of reactants 5. Presence of a catalyst

Investigate the effect of concentration on reaction rate HCl + Na 2 S 2 O 3 Na. Cl + SO 2 + H 2 O + S The formation of a pale yellow precipitate of sulphur can be used to monitor the progress of the reaction

To investigate the effect of concentration on reaction rate Next slide Add the HCl to the Na 2 S 2 O 3 in the flask Record the time taken for the X to disappear Repeat with different concentrations of Na 2 S 2 O 3 Inverse the time to get the rate

Effect of concentration on rate Conclusion ? R A T E 1 Time Rate is directly proportional to concentration CONCENTRATION

Collision Theory Factors affecting rate Particle size affects rate

Factors affecting Rate of reaction 1. Concentration 2. Temperature 3. Particle size 4. Nature of reactants 5. Presence of a catalyst

Temperature, Collisions & Activation Energy Next slide

Investigate the effect of temperature on reaction rate HCl + Na 2 S 2 O 3 Na. Cl + SO 2 + H 2 O + S The formation of a pale yellow precipitate of sulphur can be used to monitor the progress of the reaction

To investigate the effect of temperature on reaction rate Next slide Add the HCl to the Na 2 S 2 O 3 in the flask Record the temperature after mixing Record the time taken for the X to disappear Inverse the time to get the rate

Repeat at different temperatures Next slide

Effect of temperature on rate Conclusion ? R A T E 1 Rate increases with increasing temperature Time TEMPERATURE

Effect of temperature on rate What is the main factor increasing rate between A and B R A T E 1 Time B A TEMPERATURE Rate increases due to increased collisions /sec