Question

Can I get an explanation as to why for these two?

1. [2 marks] Which of the following reactions CANNOT be an elementary reaction? A. A → P; reaction rate = k [A] B. A + A → P; reaction rate = k [A]2 (C.) A+B → P; reaction rate = k [A] D. A+B → P; reaction rate = k [A][B] E. A +B+C → P; reaction rate = k [A][B][C] 2. [2 marks] For the elementary reaction: A +2 B → C, which of the following statements is FALSE? A. This reaction is third order overall. (B.) This reaction is first order with respect to A and first order with respect to C. C. This reaction is first order with respect to A and second order with respect to B. D. The rate of disappearance of A is equal to the rate of appearance of C. E. The reaction goes through exactly one transition state.

Answer 1

® Elementary Reaction ; An elementary leaction is defined . as the one step reaction whose rate of reaction is cdepends on the Stochiometric coefficients of the all - reactants. @ A >P; late = ck (A] - only one Reactant Rate dependson only CAJ. 6 Atnp ; rate = k[A2 two heactants hate depends on 2 LA]. C. 1+3, P; date= ) two different reactants are here. So, in order to be elenlentary reaction Rate must defends on 1 Power of EAJ and 1 Power of (B). But, here eate defends only 1 Power of LA). Thus, it is not an elementary leaction O ATB P; rate = k [4][B]. 1 for Both of © A+B+C -p: late = k (n[69 l these fate is . depending on the giuen stocitoimesie coelt. of all the reactants @ Qiuen llaction és ; AP2B> As this feaction is elementary reaction, So, the rate of the reaction must depends upon the

Stochiometric coefficient of all the Reactants lie, Rate of heaction is k[A] Legt. which says, late of Reaction defeneks on 1 lower of SA.ie 1st ander wor.t (A) : and a Power of [6]. lie and onder onto (6). And overall order of the reaction is 6. 3 ® statement is wrong us eoder of the leection - doesn't depends on the procluct. . @ and @ are clue as epplained aboue, ©. As the sfochiometric coefficient of and © are equal. Thus, Rate of disappearance of Ő is equal to the rate of abberiance of © . An elementary leaction is com a concested reaction i.e , one step reaction and goes through one transition state only. a