Select all of the correct statements about reaction rates from the choices below

Question

Select all of the correct statements about reaction rates from the choices below.

A. The lower the rate of a reaction the longer it takes to reach completion.


B. A balanced chemical reaction is necessary to relate the rate of disappearance of a reactant to the rate of appearance of a product.


C. The fastest step in a reaction is called the rate-determining step.


D. The rate of a slow step has more effect on the overall reaction rate than the rate of a fast step.


E. The rate of a reaction is the same as the rate constant of the reaction.


F. Solid catalysts do not affect reaction rates.


G. Reaction rate constants increase with increasing temperature.

Explanation / Answer

A. The lower the rate of a reaction the longer it takes to reach completion............true

B. A balanced chemical reaction is necessary to relate the rate of disappearance of a reactant to the rate of appearance of a product. ...................true

Example:

nA +mB .............> kC

-dx/dt = 1/n[dA/dt] = 1/K[dC/dt]


C. The fastest step in a reaction is called the rate-determining step..............false

Explanation; slowest step of the reaction mechanism is rate determining step

D. The rate of a slow step has more effect on the overall reaction rate than the rate of a fast step.............True


E. The rate of a reaction is the same as the rate constant of the reaction................False

Example:

in a first oredr reaction

rate = k[A]

in a second order reaction

rate = K[A]^2


F. Solid catalysts do not affect reaction rates...................false

Explanation:

A solid catalyst that increases the rate of a chemical reaction without being consumed in the process.

G. Reaction rate constants increase with increasing temperature.......................True

Explanation:

for every 10^0C rise in temperature reaction rate will become nearly equals to twice of initial rate of reaction constant.

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