The Arrhenius equation is k = Ae^this equation, when temperature of a reaction d

Question

The Arrhenius equation is k = Ae^this equation, when temperature of a reaction decreases, what happens to the reaction rate constant k? A) It always increases B) It always decreases. C) It may increase or decrease, depending on the value of Ea. D) It stays the same (no change). The reaction A + 2B rightarrow products has been found to have the rate law, rate = k[A][B]^2. When the concentration of A is doubled and the concentration of B is also doubled, predict by what factor the rate of reaction increases. A) 3 B) 8 C) 9 D) 27 E) 30 The appropriate unit for a zeroth-order rate constant is A) M/s B) 1/M middot s C) 1/s D) 1/M^2 middot s When the concentrations of reactant molecules are increased, the rate of reaction increases. The best is explanation for this phenomenon is that as the reactant concentration increases, A) the average kinetic energy of molecules increases. B) the activation energy increases. C) the frequency of molecular collisions increases. D) the rate constant increases. E) the order of reaction increases. For the reaction whose rate law is rate = k[X], a plot of which of the following is a straight line? A) [X] versus time

Explanation / Answer

6)

K = A*e^(-Ea/KT)

decreasing T, Ea/KT increases

SO,

e^(-Ea/KT) decreases, so K decreases

Answer: B

7)

since order of [A] is 1,

doubling A will double rate

since order of [B] is 2,

doubling B will increase rate by 4 times

Here, we are doing both,

So, rate becomes 4*2 = 8 times

Answer: B

8)

FOR 0 ORDER reaction,

rate = k

so, unit of k is same as unit of rate which is M/s

Answer: A

I am allowed to answer only 1 question at a time

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