I1. Which of the following statements (ncorretly describes the condition(s) need

Question

I1. Which of the following statements (ncorretly describes the condition(s) needed for a successfiul The relative orientation of the molecules has little or no effect on the formation of products. C. The relative orientation of the molecules has an effect only if the kinetic energy of the particles is formation of produsts according to the collision model? The collision must involve a sufficient amount of kinetic energy to overcome the activation energy above a threshold value. D. The relative orientation of the molecules mast allow for formation of the new bonds in the product. 12. Which of the following statements is/are true for a catalyst? A. The catalyst wouldn't change the reaction enthalpy n The catalyst provides a new pathway in the reaction mechanism to speed up or slow down a reaction D. All of the above statements are true. 13. Equilibrium is reached in chemical reactions when A. The rates of the forward and reverse reactions become equal B. The concentrations of reactants and products become equal. C. The temperature shows a sharp rise. D. All chemical reactions stop 14. Which of the following is true for a system whose equilibrium constant is relatively large? A. It will take a short time to reach equilibrium B. It will take a long time to reach equilibrium. The equilibrium lies to the left. The equilibrium lies to the right. 15. Express the equilibrium constant for the reaction: 2NOCI(aq) 2NO2(aq) + Cl2(aq) 2(NO, CI NO,CI 16. Given the equilibrium constants for the following reactions: Ki K2 what is equilibrium constant, K, for the reaction 2Cu)+0() 2Cu06) equivalent to? A.KK K B. K-(K/Ki 17. For the reaction Noe) + wodg-Nodg) at 750 , the equilibrium constant K. equals: A. Kp B. KA(RT) C. K(RT) D. K(RT)* IS. Consider the reaction: 2HI(g) H(g)+ bg), determine the reaction quotient, 9 Given 1.00 mole of HI(g), 0.500 mole of Ha(g), and 0.750 mole of bg) are mixed in a 5.00-L flask and0750 moe of lig) are mixed in a 5.00-L flask. A. 0.500 B. 0.375 C. 0.750 D. 0.200 19. A flask initially contains 1.00 mol/L gas A and 0.50 mo/L gas B. Gas A decomposes according to the reaction: 3A=2B+C The equilibrium concentration ofgas C is 0.125 mol. Determine the equilibrium concentration of gas A. B. 0.500 M A 0.625 M C. 0.375 M D. 0.250 M

Explanation / Answer

Ans 16

Multiply by 1/2 in the first equation

2Cu + 1/2 O2 = Cu2O

K' = K11/2

Reverse and multiply by 1/2 in the second equation

Cu2O + 1/2 O2 = 2 CuO

K'' = (1/K2)1/2

Now add the two reactions to obtain the given reaction

2 Cu + O2 = 2 CuO

K = (K1/K2)1/2

Option C is the correct answer

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