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Kinetics (Rate Laws (How to Speed Up a Reaction: (Increase the…
Kinetics
Rate Laws
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The reaction order (n) is a value in the rate law that determines how the rate depends on the concentration of the reactants.
If n=0, the reaction is zero order and the rate is independent of the concentration of the reactants.
If n=1, the reaction is first order and the rate is directly proportional to the concentration of the reactants.
If n = 2 , the reaction is second order and the rate is proportional to the square of the concentration of the reactants.
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Method of Initial Rates
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- Using Rate 2 / Rate 1 = k [A1]^n / k [A2]^n , substitute any two initial rates and the corresponding initial concentrations into a ratio of the rate laws to determine the order.
- The constant k can be cancelled out of the ratio.
- Take the log of both sides of the equation and solve for n.
- To determine the rate constant for the reaction, solve the rate law for k and substitute the concentration and the initial rate from any one of the measurements.
- Write the overall rate expression from the order of each reactant
- Repeat each step to find the order of every reactant.