Which of the following statements is true for a first order reaction? a. The rat

Question

Which of the following statements is true for a first order reaction? a. The rate of the reaction can be calculated from the balanced chemical equation and the energy of activation b. the rate of the reaction often decreases with time c, the specific rate constant equals the half life d. the units for the specific rate constant are mole liter^-1 sec^-1 For the reaction: A + B rightarrow Products if rate increases to nine times the original rate when the concentration A is tripled (B is not changed) and the rate triples when the concentration of B is tripled (A is left unchanged), the overall order for the reaction is a, first b. second c, third d none of these Which of these represents a typical graph for a second order reaction? The rate of a certain reaction A rightarrow products is 1.0 x 10^-2 mol liter^-1 sec^-1 when the if the products, the rate constant, k, concentration of A is 0.05 M. What is the numerical value for the rate constant, k, reaction is second order a. 0.20 b. 0.25 c. 2.5 times 10^-5 d. 4.0 The graph on the right shows energy relationships plotted without, and then with, a catalyst. Which statement is true concerning the graph? a. Ea(1) represents the energy of the reactants but Ea(2) represents the energy of the products b. Ea(1) represents the energy for an exothermic reaction while Ea(2) represents the energy for an endothermic reaction c. Catalysts frequently lower the energy of activation d. The value of AH changes when a catalyst is used given A + B + C rightarrow Products, the rate law for this reaction is Rate = k [A]^1 [B]^0 [C]^2 if this reaction rate is 1.0 times 10^-5 mole/(liter sec) when the concentrations of all species [A] = [B] = [C] = 0.10 M. what would the predicted rate be if all three concentrations doubled to [A] = [B] = [C] = 0.20 M?

Explanation / Answer

6) Rate of reaction often decreases with time

others is not possible

because for first order reaction k = 0.693 / t

and unit of k is /s

7) third order

because order with respect to A is 2 as

when A tripled (3) rate increases by 9 times (32 ) power 2 represents the order with respect ot A

and when B is tripled rate increases by 3 times (3) so order with respect to B is 1

total order = 2 + 1 = 3

7)

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