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# Chemical reaction 2316

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FUNDAMENTALS OF CHEMICAL REACTION

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### Chemical reaction 2316

1. 1. Chemical Reaction Engineering is the study of the rate at which reaction takes place and effect the parameters such as Temperature, Pressure and Concentration of reactants. Chemical reaction engineering gives the information about the rate of the mechanism, speed of reaction and type of reaction which can be used in designing of reactions in bioreactor.
2. 2. FUNDAMENTAL CONCEPTS OF CHEMICAL REACTION Reaction rate or Rate of reaction Rate law or Rate of reaction or Kinetic law Rate constant
3. 3. RATE OF REACTION It is defined as change in molar concentration of species per unit time or rate at which change in concentration of reactants decreases per unit time or increase in concentration of products per unit time.
4. 4. For Reactants: Rate = -change in conc. of reactants time  -ve sign indicates decrease in concentration of reactants. For products: Rate = change in conc. of products time  +ve sign indicates increase in concentration of products.
5. 5. UNITS Rate = change in conc. time = mol ∕ lt.sec = mol.lit-1.sec-1
6. 6. RELATION BETWEEN THE CONCENTRATION OF REACTANTS AND PRODUCTS OR RATE OF REACTION WITH TIME: time Rateofreaction time Changeinconc. ofreactants time Rateofreaction time Changeinconc. ofproducts
7. 7. REPRESENTATION OF GENERAL EQUATION FOR REACTION Consider xA+yB mC+nD The relation between rates measured with respect to A,B C and D is -1 dA=-1 dB=1/m . dC=1/n . dD x dt dt dt
8. 8. RATE LAW OR RATE EQUATION OR KINETIC LAW The equation which relates the rate of reaction and the concentration of reactants in a reaction is called rate law or rate equation . Consider an equation: xA+yB product Rate α [A]x [B]y Rate=k[A]x [B]y This equation is called rate equation where x,y are powers of the concentration of reactants. ‘k’ is rate constant
9. 9. RATE CONSTANT Rate constant of a chemical reaction is a measure of rate of reaction, when all reactants are unit conc. Rate constant = Rate of reaction [reactants]n Rate= Rate concentration Rate constant depends on temperature Rate constant α temperature
10. 10. UNITS Rate constant (k) = Rate of reaction [reactants]n k = mol.lit-1.sec-1 [mol]n.[lit]-n =[mol]1-n.[lit]n-1.sec-1 =[conc.]1-n. sec-1 These two equations are called general nth order equation.
11. 11. SIGNIFICANCE The rate constant ‘k’ for a reaction is simply denotes how fast the reaction occurs if all the reactants are brought about unit concentration.
12. 12. THANK YOU