AP Chem 5.4 Elementary Reactions & 5.5

Multiple Choice

Which term describes the sequence of elementary steps that leads to product formation in a chemical reaction?

• Reaction mechanism

• Catalyst

• Intermediate

• Rate law

Multiple Select

Which of the following are considered reaction intermediates in the mechanism for the decomposition of formic acid?

• HCOOH

• HCOOH2+

• HCO+

• CO

Fill in the Blanks

The slowest step in a reaction mechanism is known as the

determining step.

Multiple Choice

If the first step of a reaction mechanism is slow, what will the rate law for the overall reaction depend on?

• The stoichiometry of the first elementary reaction

• The stoichiometry of the last elementary reaction

• The concentration of intermediates

• The fastest step

Multiple Choice

Which of the following are intermediates in the reaction between NO2 and CO to produce NO and CO2?

• NO2

• NO3

• CO

• CO2

Multiple Choice

As reactant concentration increases, what happens to the number of collisions and the reaction rate?

• Both decrease.

• Number of collisions increases, but reaction rate decreases.

• Both increase.

• Number of collisions decreases, but reaction rate increases.

Multiple Select

Which of the following statements about molecular orientation and reaction success is/are correct?

• Proper orientation is necessary for a reaction to occur.

• Any orientation will result in a reaction if there is sufficient energy.

• Wrong orientation can prevent a reaction even if energy is sufficient.

• Molecules always react upon collision.

Multiple Choice

Which of the following changes will NOT increase the rate of a chemical reaction?

• Increasing surface area

• Increasing concentration

• Decreasing temperature

• Adding a catalyst

Multiple Choice

Which of the following statements best describes the effect of temperature on the Maxwell-Boltzmann distribution for a reaction?

• Increasing temperature shifts the distribution to higher speeds and flattens the curve.

• Decreasing temperature shifts the distribution to higher speeds and flattens the curve.

• Increasing temperature shifts the distribution to lower speeds and sharpens the curve.

• Temperature has no effect on the Maxwell-Boltzmann distribution.