Chapter07 - Applied Science Department (ASD) Centre for...

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PCE 0015 Chemistry for Engineers Foundation in Engineering ONLINE NOTES Chapter 7 REACTION KINETICS AND EQUILIBRIUM FOSEE , MULTIMEDIA UNIVERSITY (436821-T) MELAKA CAMPUS, JALAN AYER KEROH LAMA, 75450 MELAKA, MALAYSIA. Tel 606 252 3594 Fax 606 231 8799 URL: http://fosee.mmu.edu.my/~asd/ Applied Science Department (ASD) Centre for Foundation Studies and Extension Education (FOSEE)
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PCE0015 Chemistry For Engineers Chapter 7 7.1 The Rate of a Reaction 7.2 The Rate Law 7.3 Relation Between Reactant Concentration and Time 7.4 Reaction Mechanism 7.5 Catalysis 7.6 The Concept of Equilibrium 7.7 Factors That Affect Chemical Equilibrium Upon completion of this chapter, you should be able to: 1. Understand the rate of a reaction. It is the change in the concentration of a reactants or products over time. The rate is not constant, but carries continuously as concentration change. 2. Express rate law : the relationship of the rate of a reaction to the rate constant and the concentrations of the reactants raised to appropriate powers. 3. Understand the relation between reactant concentration and time. 4. Define reaction mechanism. If one step in a reaction mechanism is much slower than all other steps, it is the rate-determining step. 5. Elaborate types of catalyst and its functions : homogeneous catalyst and heterogeneous catalyst. 6. Understand the concept of equilibrium. A chemical equilibrium process in which all reactants and products are in the same phase is homogeneous. If the reactants and products are not all in the same phase, the equilibrium is heterogeneous. 7. Express the factors that affect the chemical equilibrium : Le Châtelier’s Principle. __________________________________________________________________________________ HST/MAM 2/ 18
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PCE0015 Chemistry For Engineers Chapter 7 7.1 THE RATE OF A REACTION Chemical kinetics is the area of chemistry concerned with the speeds , or rates, at which a chemical reaction occurs . Kinetics refers to the rate of a reaction, or the reaction rate , which is the change in the concentration of a reactant or a product with time (M/s). Any reaction can be represented by the general equation A (reactants) B (products) This equation tell us that during the course of a reaction, reactants are consumed while products are formed. As a results, we can follow the progress of a reaction by monitoring either the decrease in concentration of the A (reactants) or the increase in concentration of the B (products) as shown in figure below. In general, it is more convenient to express the reaction rate in terms of change in concentration with time. Thus for the reaction A B we can express the rate as [A] [B] rate = - or rate = t t where [A] and [B] are the changes in concentration (molarity) over a time period t. Because the concentration of A
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This note was uploaded on 06/16/2011 for the course ENGR 101 taught by Professor Ahmed during the Summer '11 term at Multimedia University, Cyberjaya.

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Chapter07 - Applied Science Department (ASD) Centre for...

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