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OCR (A) A-Level Chemistry: Rate equations and rate constants — orders of reaction, rate-determining steps, and worked examples with calculations. 19 янв. 2025 г. · Learn about investigating reaction rates for your A-level chemistry exam. Find information on methods, data collection, and analysis techniques. Not all stages of a reaction occur at the same rate, but the overall rate is determined by the slowest step of the reaction, also known as the rate determining step. The order of reaction with respect to its reactant can be found out using a reaction rate versus a concentration graph. The shapes of the graph for different orders are given in the figure below. Each step in a reaction mechanism can have a different rate, but the step with the slowest rate controls how fast the reaction proceeds overall. The rate equation reveals the rate-determining step. 1 янв. 2022 г. · Normally to work out the rate equation we do a series of experiments where the initial concentrations of reactants are changed (one at a time) and measure the initial rate each time. The books shown below are recommended by teachers and students. Click on the books to find out more. 13 нояб. 2025 г. · Revise chemical kinetics, the rate equation and order of reactions from concentration-time graphs and how to deduce the order of reaction from half life. Rate equations can be determined experimentally by monitoring concentration of a reaction mixture over time. The concentration-time graph produced can be used to find the rate by drawing a tangent to the … By knowing the rate equation for a reaction, we can determine how the reaction rate will change as the concentrations of reactants change, and we can design experiments to optimize the reaction conditions.