AUP Chapter 12 Reaction kinetics (for Student)

AUP Chapter 12 Reaction kinetics (for Student) - 12 12.1...

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12 Reaction Kinetics 12.1 Rate Law Rate of reaction is refered to as the change of the concentration of reactant or product with time. Consider the reaction A B The equation tells us that during the course of reaction, reactant molecules (A) are consumed while product molecules(B) are formed. As a result concentration of the reactant decreases while concentration of the product increases. Figure 12.1.1: The Change in Concentration with Time for the Reaction A B Instantaneous rate is determined from a graph of time versus concentration by drawing a line tangent to the curve at the point that corresponds to a particular time. Br 2 (aq) + HCOOH(aq) 2Br - (aq) + 2H + (aq) + CO 2 (g) The instantaneous rate of the above reaction at t = 100s, 200s and 300s are given by the slope of the tangents at these times in Figure 10.1.2. Figure 12.1.2 : The Time versus Concentration
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[Br 2 ] final - [Br 2 ] initial Average rate = t final – t initial 12.2 Reaction Rate and Stoichiometry For stoichiometrically simple reaction such as , A B Rate = - d[A] = d[B] d t d t The minus sign indicates concentration of A decreases. Unit:
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AUP Chapter 12 Reaction kinetics (for Student) - 12 12.1...

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