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.

Answer 1

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.