Expt 1-Factors Affecting Reaction Rate

Fact actors ors Affe ffecti cting ng Reacti eaction on Rate Lascano Normilando P. V Lavarias Alyssa Katrina G.

Trusted by over 1 million members

Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.







Introduction • Chemical reactions occur at different rates. • Rate is the speed at which the reaction takes place and is influenced by several factors. • Collision theory and the transition-









What affects the rates? • Nature of Reactants • Concentration • Surface Area • Temperature • Presence of catalysts









What affects the rates? • Nature of Reactants - The lesser the stability of the reactant, the higher its kinetic energy, the greater its reactivity - In general, reaction that goes proceeds fast have low activation energy.









What affects the rates? • Concentration - The effect of the change in concentration reactants can be summarized in the Rate Law Expression

Rate = k[A]x[B]y - For most reactions, RLE is more concerned









What affects the rates? • Surface Area – The greater the amount of area exposed, the higher the rate as it offers greater amount of the reactant available for collision

• Temperature - By increasing the temperature, the average KE of the system also increases making it more entropic, which











What affects the rates? • Presence of catalysts - Catalysts are substances that speed up or slow down the rate of reaction without being altered.











Procedure : Nature of Reactants











Procedure : Concentration Constant [HCl] Treatments: 1.5.ml 0.15M Na2S2O3 + 1ml 3M HCl 2.4mL 0.15M Na2S2O3 + 1mL H2O 1ml 3M HCL 3.3mL 0.15M Na2S2O3 + 2mL H2O 1ml 3M HCL











Procedure : Surface Area











Procedure : Temperature

Test tube 1: 5ml of 0.15M













Procedure : Catalysts











Results:











Results:











Results:











Results:



























































Expt 1-Factors Affecting Reaction Rate

Recommend Documents