Which ONE of the following statements is incorrect? The rates of most chemical r
ID: 997608 • Letter: W
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Which ONE of the following statements is incorrect? The rates of most chemical reactions change with time. The rate constant for a reaction can be changed by changing the temperature. The value of the rate constant is dependent on the reactant concentrations. In a series of stepwise reactions, the rate-determining step is the slowest one. The rate of a catalyzed reaction is dependent on the concentration of the catalyst. A radioactive isotope undergoes first-order decay with rate constant 0.004226 d^-1. What is the half-life of this isotope? The effect of adding a catalyst to a reaction is to increase the number of collisions between reactants. lower the activation energy of a reaction. increase the equilibrium constant K_c of a reaction. increase the theoretical yield of the products. change delta H degree of the reaction so that the reaction becomes exothermic. Which ONE of the chemical equations below corresponds to the equilibrium constant expression at the right? 1/2 N_2(g) + 3/2 H_2(g) NH_3 (g) N_2(g) + 3H_2(g) 2 NH_3(g) 2 NG_3(g) N_2(g) + 3H_2(g) NH_3(g) 1/2 N_2(g) + 3/2 H_2(g) 2 N_2(g) N_2(g) + 6H_2(g) 4 NH_3(g)Explanation / Answer
15. E) The rate of a catalyzed reaction is dependent on the concentration of the catalyst. Yes, the catalyst speeds up the reaction but its concentration is not part of the rate of reaction expression: k(A)n(B)m where A and B are product concentrations, not catalyst's.
16. D) 164.0 days. To get half life from the rate constant we just divide ln2 by the constant:
t (1/2) = ln2/k
t (1/2) = ln2/0.004226d-1
t(1/2) = 164.0 days
17. A) increase the number of collisions between reactants.
18. D) Because the superscripts of each component in kp is the coefficient in the balanced chemical reaction. Also kp = (pressure of products)/(pressure of reactants) this is why the correct answer is D not A (because NH3 is a reactant, not a product):
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