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Define rate law, determine order and rate constant units, and differentiate between order and molecularity.
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Defines rate law, rate constant, and reaction order.
The rate of a chemical reaction at a given temperature depends on the concentration of its reactants. We represent this relationship using a rate law (or rate equation).
A comparison matrix for order vs molecularity helps solidify distinctions.
clean side-by-side comparison, consistent visual treatment for both sides, same scale and style, pastel color coding to …
Standard rate law formula.
Important Condition: The overall order of the reaction is calculated as . The values of x and y are independent of the balanced chemical equation's stoichiometry.
Worked example calculating overall order from given rate expressions.
Problem. Calculate the overall order of a reaction which has the rate expression: (a) (b)
MCQ to test the concept of order based on rate law.
For a reaction, ; the rate law is given by, . What is the overall order of the reaction?
Explains how the units of k depend on the overall order of the reaction.
The unit of the rate constant changes depending on the overall order of the reaction. This is because the unit of () is fixed, but the concentration terms on the other side of the equation change.