Unit 5: Module 1 - Rates, Equilibrium and pH (F325) 0.0 / 5 ChemistryRatesEquilibriaAcids, bases and saltsA2/A-levelOCR Created by: louis carrowCreated on: 05-04-15 19:10 Rate of reaction The change in concentration of a reactant or product per unit of time. 1 of 10 Units of rate mol dm^-3 s^-1 (concentration/time) 2 of 10 Initial rate of reaction The change in concentration of a reactant or product per unit of time at the start of the reaction, when T=0. 3 of 10 Rate equation for a reaction A + B -> C Rate = k[A]^m[B]^n ('m' is the order of reaction with respect to A, 'n' is the order of reaction with respect to B) 4 of 10 Order with respect to a reactant The power to which the concentration of the reactant is raised in the rate equation. 5 of 10 Zero Order, rate ≈ [A]^0 Rate is UNAFFECTED by changing the concentration of A. 6 of 10 First Order, rate ≈ [B]^1 If [B] increases by 2 times, the rate also increases by 2 times. 7 of 10 Second Order, rate ≈ [C]^2 If [C] increases by 2 times, the rate increases by 2^2 = 4 times. 8 of 10 Overall Order of reaction The sum of the individual orders, m + n. 9 of 10 Rate Constant, k The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their orders in the rate equation. 10 of 10

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