Rates 0.0 / 5 ? ChemistryRatesA2/A-levelOCR Created by: Abi9ai1Created on: 27-11-19 13:49 Describe the shape of a zero order concentration time graph . 1 of 21 Explain the shape of a zero order concentration time graph The concentration of the reactant does not have an impact on the rate of reaction. So the grsdient remains constant. 2 of 21 Describe the shape of a first order concentration time graph . 3 of 21 Explain the shape of a first order concentration time graph. The rate of reaction is proportional to the concentration of a reactant. 4 of 21 What is a half life? The time taken for the concentration of a reactant to halve. 5 of 21 What is the half life for a first order reaction Constant 6 of 21 What graph should half life be measured from to determine order? Concentration-time graph 7 of 21 A is 1st order B is 2nd order and C is 0 order, what is the rate equation? Rate = k[A] [B]² 8 of 21 Define order The order of a reactant is the power to which the reactant's (or catalyst's) concentration is raised in the rate equation. 9 of 21 What is overall order? The overall order of a reaction is the sum of the individual orders in the rate equation. 10 of 21 What is the symbol for the rate constant? k 11 of 21 How does a zero order reactant effect rate? No effect 12 of 21 How does a first order reactant effect rate? The change in rate is the same as the change in concentration 13 of 21 How does a first order reactant effect rate? The change in rate is the square of the change in concentration. 14 of 21 Describe the shape of a 0 order rate-concentration graph . 15 of 21 Describe the shape of a 1st order rate-concentration graph . 16 of 21 Describe the shape of a 2nd order rate-concentration graph . 17 of 21 Explain the shape of a 0 order rate-concentration graph The concentation has no effect on the rate, giving a graph with a constant rate. 18 of 21 Explain the shape of a 1st order rate-concentration graph The rate is proportional to the concentration giving a graph with a straight line through the origin. 19 of 21 Explain the shape of a 2nd order rate-concentration graph The rate is proportional to the square of the concentration giving a graph with a curve. 20 of 21 What is the rate determining step? The slow step in a multi-step reaction, and the reactants in this step appear in the rate equation. 21 of 21

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