Before beginning this experiment in the laboratory, you should be able to answer

ID: 480717 • Letter: B

Question

Before beginning this experiment in the laboratory, you should be able to answer the following questions. What factors influence the rate of a chemical reaction? What it the general form of a rate law? What is the order of reaction with respect to A and B for a reaction that obeys the rate law: rate = k[A]^2[B]^3? Write the chemical equations involved in this experiment and show that the rate of disappearance of [S_2O_8^2-] is proportional to the rate of appearance of the blue-black color of the starch iodine complex. It is found for the reaction A + B rightarrow C that doubling the concentration of either A or B quadruples the rate of the reaction. Write the rate law for this reaction.

Explanation / Answer

1) Generally there are few factors will influences the rate of the reaction.

i) Initial concentrations of reactants: If the no of molecules are more, the interaction between them will be more and the formation of products also more. In either case if the no of molecules are less, then the availability of molecules decreases and the distance between the present molecules reduces and the reaction may not occur sometimes(slow).

Rate proportional to the [concentration]n

ii) Catalyst: the role of catalyst is quite interesting because it influences a lot on the chemical reaction. if the reactants are not having enough energy to cross over the barrier, they will provide the energy and reactant proceeds. if the reactants are having high threshold energy, catalysts absorbs this energy and reaction proceeds naturally.

iii) Temperatures: According to arrhenius theory, temperature increases the internal energy of reactant molecules increases as a results collision between them increases and products will formed very easily. (Concept of Activation energy (Ea))

K=Ae-Ea/RT (Arrhenius Equation)

2) Rate Law : Rate [A]m[B]n[C]p A,B, C are the reactant molecules. Order = m+n+p

3) For the given rate= K[A]2[B]3 Order = 2+3=5

4) S2O8-2 +3I- ------> 2SO4-2 +I3-

5) Rate = K [A]2[B] or Rate = K [A][B]2

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Before beginning this experiment in the laboratory you should be able to answer

Before beginning this experiment in the laboratory, you should be able to answer

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Before beginning this experiment in the laboratory, you should be able to answer

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