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Chemical Kinetics

Short Answer Type

81. Which of the reactions slow or fast, will have higher activation energy?

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82. What information can we had from the statement that the energy of activation of a reaction is zero?

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83. Define collision frequency factor.

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84. For the reaction H₂ + I₂ → 2HI, What is the molecularity of the reaction?

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85. Define the term ‘order of reaction’ for chemical reactions.

The sum of powers of the concentration of the reactants in the rate law expression is called the order of that chemical reaction.
Order of a reaction can be 0, 1, 2, 3 and even a fraction.

For example for a reaction

Rate = k [A]^x [B]^y
order = x + y

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86. The decomposition of dimethyl ether leads to the formation of CH₄, H₂ and CO and the rate is given by
Rate = k[CH₃OCH₃]^3/2
The rate of reaction is followed by increase in pressure in a closed vessel, so the rate can also be expressed in terms of the partial pressure of dimethyl ether, i.e.,
Rate = k pCH₃O CH₃^3/2.
If the pressure is measured in bar and time in minutes, then what are the units of rate and rate constants?

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87. List the factors on which the rate of a chemical reaction depends.

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Long Answer Type

88. From the rate expression for the following reactions, determine their order of reaction and the dimensions of the rate constants
(i) 3NO(g) → N₂O (g) Rate = k[NO]²
(ii) H₂O₂ (aq) + 3I^– (aq) + 2H⁺ → 2H₂O (l) + I^-₃Rate = k[H₂O₂][I^-]
(iii) CH₃CHO (g) → CH₄ (g) + CO(g) Rate = k [CH₃CHO]3/2
(iv) C₂H₅Cl (g) → C₂H₄ (g) + HCl (g) Rate = k [C₂H₅Cl]

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89. A reaction is second order with respect to a reactant. How is the rate of rection affected if the concentration of the reactant is
(i) Doubled
(ii) Reduced to 1/2?

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90. A reaction is first order in A and second order in B
(i) Write differential rate equation.
(ii) How is the rate affected when the concentration of B three times?
(iii) How is the rate affected when the concentrations of both A and B are doubled?

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