By Murat DURKAYA, Osman YILDIRIM, Ayhan NAZLI
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Additional resources for Chemistry Heat Chemical Kinetics and Electrochemistry (Zambak)
10–3 10–4 6. 2CO(g) + Cl2(g) → 2COCl(g) If the concentrations of reactants are doubled, how many times does the rate increase? I. Activation energy II. Collision with a proper geometry A) 2 B) 4 C) 6 D) 8 E) 10 III. Catalyst Which of the criteria above must be supplied in order to result in a reaction? A) I only B) III only D) II and III C) I and II E) I and III 7. Potential energy (PE) versus reaction coordinate (RC) graphs for some reactions are given below. Which of these graphs shows the fastest reaction?
Rate = k [A] [B]2 The order of the reaction is; 1 + 2 = 3, third order. 2 . 4 . 0 . 8 . 10–5 For the table above, which shows the experimental values for the reaction below, 2A(g) + B(g) + 3C(g) → 2D(g) + Z(g) Provide the following; a. Write the rate expression. b. Find the k value. c. What is the order of the reaction? d. What are the reactants of the slowest step? Answer : a. Rate = k[A] [C]2 b. 03 c. 3 d. A and C The Temperature of the System The rates of most reactions increase as the temperature of the system rises.
10–3 Find; a. The rate equation, b. The reactants for the slow step, c. The rate constant, k, d. Order of the reaction 46 Heat, Chemical Kinetics and Electrochemistry Rate = k[A]x [B]y If x and y are found, the problem can easily be solved. a. In experiments 1 and 2, the concentration of B is kept constant. So, by comparing the concentration of A and its corresponding rate values, x can be determined. 01] 1 1 x — = (—) 2 2 ⇒ The rate constant, k, is not affected by the change in concentration. 2 .