AP Chemistry Kinetics

After a certain pesticide compound is applied to crops, its decomposition is a first-order reaction with a half-life of 32.5 days. What is the rate constant, k, for the decomposition reaction?

• 0.0213 day^-1

• 0.0308 day^-1

• 32.5 day^-1

• 46.9 day^-1

What effect will increasing [H⁺] at constant temperature have on the reaction represented?

• The activation energy of the reaction will increase.

• The activation energy of the reaction will decrease.

• The frequency of collisions between H⁺ and ClO^- will increase.

• The value of the rate constant will increase.

Tags

NGSS.HS-PS1-5

Which of the following best helps explain why an increase in temperature increases the rate of a chemical reaction?

• At higher temperatures, reactions have a lower activation energy.

• At higher temperatures, reactions have a higher activation energy.

• At higher temperatures, every collision results in the formation of a product.

• At higher temperatures, high-energy collisions happen more frequently.

Tags

NGSS.HS-PS1-5

The isomerization of cyclopropane to propylene is a first-order process with a half-life of 19 minutes at 500 C. The time it takes for the partial pressure of cyclopropane to decrease from 1.0 atm to 0.125 atm at 500 C is closest to

• 38 min

• 57 min

• 76 min

• 152 min

Tags

NGSS.HS-PS1-5

• The reactant must be first order because there is only reactant species.

• The reaction is first order if the plot of ln [H₂O₂] versus time is a straight line

• The reaction is first order if the plot of 1/[H₂O₂] versus time is a straight line

• The reaction is second order because 2 is coefficient of H₂O₂ in the chemical equation.

Tags

NGSS.HS-PS1-5

• The decomposition of N₂O₅ is a zero order reaction.

• The decomposition of N₂O₅ is a first order reaction.

• The decomposition of N₂O₅ is a second order reaction.

• The overall reaction order is 3.

Tags

NGSS.HS-PS1-5

• Rate = k[NO][O₂]

• Rate = k[NO][O₂]²

• Rate = k[NO]²[O₂]

• Rate = k[NO]²[O₂]²

Tags

NGSS.HS-PS1-5

Which of the following is the rate law for the reaction below that is consistent with the proposed mechanism?

• Rate = k[NO₂][CO]

• Rate = k[NO₂]²

• Rate = k[NO₃][CO]

• Rate=k[NO][NO₃]

Tags

NGSS.HS-PS1-5

• R / 2

• R

• 2 R

• 4 R

Tags

NGSS.HS-PS1-5

• The rate is halved.

• The rate is the same.

• The rate is doubled.

• The rate is quadrupled.

Tags

NGSS.HS-PS1-5