Rate of reaction and definitions 0.0 / 5 ? ChemistryRatesA2/A-levelOCR Created by: une-meduseCreated on: 26-05-13 18:01 The change in concentration of a reactant or product per unit of time Rate of reaction 1 of 15 As a reaction proceeds, concentrations of the reactants decrease and therefore fewer collisions take place per second between reactant particles Rate slows down 2 of 15 You can measure the slope, and therefore the rate, by drawing a tangent and calculating The gradient 3 of 15 The change in concentration of a reactant, or product, per unit time at the start of the reaction when t=0 Initial rate of reaction 4 of 15 Rates can be measured involving acids or bases by a) titration b) pH probes 5 of 15 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 The rate constant, k 6 of 15 The rate is unaffected by a change in concentration, which order? Zero 7 of 15 If the order is ____ then rate is directly proportional to [reactant]^1 First 8 of 15 If the order is _____ then rate is directly proportional to [reactant]^2 Second 9 of 15 The time taken for the concentration of the reactant to be reduced by half Half life 10 of 15 For zero order reactions, half life Decreases with time 11 of 15 For second order reactions half life Increases with time 12 of 15 For first order reactions half life Remains constant 13 of 15 A reaction mechanism is A series of steps that altogether make up the overall reaction 14 of 15 The rate determining step is The slowest step in the reaction mechanism of a multi step reaction 15 of 15
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