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42. Define the order of a reaction.

The order of a reaction is equal to the sum of the powers (exponents) to which the various concentration terms are raised in the rate law expression of the reaction.
Rate = k [A]^x [B]^y
order = x + y

for example

Rate = k [A]^1/2 [B]^3/2 So order = 1/2 + 3/2 = 2, i.e., second order.

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43. Define first order reaction. What are its units?

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44. Define second order reaction? Give one example and units of K.

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45. In some cases it is found that a large number of colliding molecules have energy more than threshold value, yet the reaction is slow. Why?

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46. How does the value of rate constant vary with reactant concentration?

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47. A substance with initial con-centration ‘a’ follows zero order kinetics. In how much time will the reaction go to complet-ion?

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48. The reaction A + B → C has zero order. What is the rate equation?

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49. What is the effect of temperature on the rate constant of reaction? How can this temperature effect on rate constant be represented quantitatively?

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