1 3 (g) + 5 O2 (g) --> 4 NO(g) + 6 H2 O(g), -D [NH3 ]/D t = 2.6 x 10-3 M/s at a particular time. What is the value of -D [O2 ]/D t at the same instant?A) 1.3 x 10-2 B) 2.1 x 10-3 M/s C) 2.6 x 10-3 M/s D) 3.3 x 10-3 M/s E) 5.2 x 102 M/s 2 3 Cl + OH- ----> CH3 OH + Cl- . At some temperature, the following data are collected:
1. When [CH3 Cl] is doubled, the rate doubles.
2. When [OH- ] doubles, the rate doubles.A) The reaction is first order with respect to CH3 Cl B) The reaction is first order with respect to OH- . C) The reaction is second order overall D) All of the above. 3 -4 s-1 ?A) 0.0014 min B) 707 min C) 12 min D) 2.45 min E) None of the above 4 o C, the second order rate constant for the reaction I- + ClO- ----> IO- + Cl- is 0.0805 M-1 s-1 . If a solution is initially 4.05 x 10-3 M with respect to each reactant, what will be the concentration of each species present after 250 s? (Treat it as if there is only one reactant.)A) 4.96 x 10-3 M B) 2.01 x 10-3 M C) 2.67 x 10-3 M D) 3.75 x 10-3 M 5 o C was found to be 4.0 x 10-3 L/mol.s has an activation energy of 35.0 kJ/mol. What is the rate constant for this reaction at 850 o C?A) 7.1x 10-3 L/mol·s B) 5.25 x 10-6 L/mol·s C) 5.78 x 10-2 L/mol·s D) 1.8 x 10-3 L/mol·s E) 1.0 x 10-3 L/mol·s 6 A) Rate = k[C][D] B) Rate = k[A] C) Rate = k[A][B]2 D) Rate = k[A][B] E) Rate = k[B] 7 3 )3 CCl + OH- ----> (CH3 )3 COH + Cl- , which is first order in (CH3 )3 CCl and first order overall?A) A one-step mechanism involving a transition state that contains two hydroxide ions "attached" to the carbon atom of (CH3 )3 Cl B) A one-step mechanism involving a transition state that has a carbon partially bonded to both chlorine and oxygen C) A two-step mechanism in which the chlorine leaves (CH3 ) 3 Cl in a slow step, followed by rapid attack of the intermediate by the hydroxide ion D) A two-step mechanism in which the chlorine leaves (CH3 )3 Cl in a rapid step, followed by the slow attack of the intermediate by the hydroxide ion 8
H+ + H2 O2 ----> H2 O+ --OH (rapid equilibrium)
H2 O+ --OH + Br- ----> HOBr + H2 O (slow)
HOBr + H+ ----> Br2 + H2 O (fast)A) 2 H+ + H2 O2 + Br- + HOBr ----> H2 O+ --OH + Br2 + H2 O B) H2 O+ --OH + H+ + Br- ----> Br2 + H2 O C) 2 H+ + 2 Br- + H2 O2 ----> Br2 + 2 H2 O D) 2 H2 O+ --OH + 2 Br- ----> H2 O2 + Br2 + 2 H2 O 9 A) it supplies energy to the reactant molecules, allowing more of them to achieve energies in excess of the activation energy for the reaction B) it increases the temperature of the molecules in the reaction mixture C) it increases the number of collisions between molecules D) it lowers the activation energy of the reaction by providing a lower energy mechanism or pathway 10 4+ ][Mn2+ ].
2 Ce4+ + Tl+ ---> 2 Ce3+ + Tl3+
One mechanism for this reaction, containing the following elementary steps, is shown below:
Ce4+ + Mn2+ ---> Ce3+ + Mn3+
Ce4+ + Mn3+ ---> Ce3+ + Mn4+
Tl+ + Mn4+ ---> Tl3+ + Mn2+ A) There is no catalyst and no intermediate. B) There is no catalyst, but Mn2+ is the intermediate. C) Mn3+ is the catalyst and there is no intermediate. D) Mn2+ is the catalyst and Mn3+ and Mn4+ are the intermediates. E) Mn4+ is the catalyst and Mn2+ and Mn3+ are the intermediates. F) Ce3+ is the catalyst and Tl+ and Mn4+ are the intermediates.
.
