https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:kinetics/x2eef969c74e0d802:reaction-mechanisms/v/elementary-rate-laws 2021-01-30T09:09:57Z Elementary reactions An elementary reaction is a reaction that occurs in a single step. The rate law for an elementary reaction can be derived from the coefficients of the reactants in the balanced equation. For example, the rate law for the elementary reaction 2A + B → products is rate = k[A]²[B]. Jay video https://cdn.kastatic.org/googleusercontent/AhOfL12YiiZr_H04YyHURU2JzO0vZcewjRedUBkl5TK1QUpDfvCsa5VeuzM_hv3Ytocg5bczaz2mvqT8PaA96bFo Elementary reactions An elementary reaction is a reaction that occurs in a single step. The rate law for an elementary reaction can be derived from the coefficients of the reactants in the balanced equation. For example, the rate law for the elementary reaction 2A + B → products is rate = k[A]²[B]. https://cdn.kastatic.org/ka-youtube-converted/vIZ0LnLo3jE.mp4/vIZ0LnLo3jE.mp4 335 Reaction mechanism https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:kinetics/x2eef969c74e0d802:reaction-mechanisms/v/mechanisms-and-the-rate-determining-step 2021-01-30T09:10:01Z Reaction mechanism and rate law A reaction mechanism is the sequence of elementary steps by which a chemical reaction occurs. Many reaction mechanisms contain one step that is much slower than the others; this step is known as the rate-determining step. If the rate-determining step is the first step in a mechanism, the rate law for the overall reaction can be derived directly from the stoichiometry of the step's balanced equation. Jay video https://cdn.kastatic.org/googleusercontent/NRyY2hMXWhX2dYuFyJ9LutYo0X6SOfrlGCfx3NYoPSJg8YPJmjrWIINazbURlPbFXBEZS-7tYIIPzxUozt9sZYEd Reaction mechanism and rate law A reaction mechanism is the sequence of elementary steps by which a chemical reaction occurs. Many reaction mechanisms contain one step that is much slower than the others; this step is known as the rate-determining step. If the rate-determining step is the first step in a mechanism, the rate law for the overall reaction can be derived directly from the stoichiometry of the step's balanced equation. https://cdn.kastatic.org/ka-youtube-converted/ShzW1LoQgoc.mp4/ShzW1LoQgoc.mp4 522 Reaction mechanism https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:kinetics/x2eef969c74e0d802:reaction-mechanisms/a/reaction-mechanisms 2021-04-29T07:48:56Z Reaction mechanism and rate law article https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:kinetics/x2eef969c74e0d802:reaction-mechanisms/v/the-pre-equilibrium-approximation 2022-10-05T02:43:18.611402953Z The pre-equilibrium approximation The pre-equilibrium approximation is used to find the rate law for a reaction with a fast and reversible initial step. In this method, we first write the rate law based on the slow (rate-determining) step. Then, to eliminate any intermediates from the rate law, we use the fast initial step to solve for the intermediate concentration(s) in terms of reactant and/or product concentrations. Jay video https://cdn.kastatic.org/ka_thumbnails_cache/088d15cb-cacf-4266-a576-4d8917961e4b_1280_720_base.png The pre-equilibrium approximation The pre-equilibrium approximation is used to find the rate law for a reaction with a fast and reversible initial step. In this method, we first write the rate law based on the slow (rate-determining) step. Then, to eliminate any intermediates from the rate law, we use the fast initial step to solve for the intermediate concentration(s) in terms of reactant and/or product concentrations. https://cdn.kastatic.org/ka-youtube-converted/4czm7qIbUjA.mp4/4czm7qIbUjA.mp4 443 Reaction mechanism https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:kinetics/x2eef969c74e0d802:reaction-mechanisms/e/reaction-mechanisms-ap 2021-04-29T08:01:03Z Reaction mechanisms Check your understanding of reaction mechanisms in this set of free practice questions designed for AP Chemistry students. exercise