Kinetics AP Chemistry

Consider the following rate law: Rate = k[A]ⁿ[B]^m
How are the exponents n and m determined?

• by using balanced chemical equation

• By using the subscripts for the formulas

• By educated guess

• By experiment 

Tags

NGSS.HS-PS1-5

The rate law for a reaction is rate = k [A][B]2 Which one of the following statements is false?

• If [B] is doubled, the reaction rate will increase by a factor of 4.

• The reaction is second order in B.

• The reaction is first order in A.

• The reaction is second order overall.

Tags

NGSS.HS-PS1-5

The graph shown depicts the relationship between concentration and time. What is the slope of this line?

• -k

• -1/k

• k

• ln[A]o

Tags

NGSS.HS-PS1-5

Which of the two graphs show a state of equilibrium being reached?

• A

• B

• A and B

• Neither.

During a science fair, Abigail, Evelyn, and Priya conducted an experiment to observe the rate at which a sugar cube dissolves in water at room temperature. What is the unit of the reaction rate they observed?

• Molarity (M)

• Molarity per second (M/s)

• Kelvin (K)

• Joules (J)

Answer explanation

The unit of reaction rate in a chemical reaction is Molarity per second (M/s), which represents the change in concentration of reactants or products per unit time.

Tags

NGSS.HS-PS1-5

Why does a higher surface area of a solid reactant increase the reaction rate?

• It increases the density of the reactant

• It decreases the path length for diffusion

• It increases the number of available reactive sites

• It increases the activation energy required for the reaction

Tags

NGSS.HS-PS1-3

In a chemical reaction, if the concentration of reactants is increased, what happens to the reaction rate?

• It decreases

• It increases

• It remains unchanged

• It initially increases, then decreases

Tags

NGSS.HS-PS1-5

Crushing a solid catalyst into finer particles before adding it to a reaction mixture will:

• Decrease the reaction rate.

• Have no effect on the reaction rate.

• Increase the reaction rate.

• Stop the reaction.

Answer explanation

Increasing the surface area of a solid reactant will increase the reaction rate by providing more area for collisions between reactant particles.

What is the significance of the activation energy in a chemical reaction?

• It is the energy released during the reaction

• It is the minimum energy required for reactants to transform into products

• It determines the color of the reaction mixture

• It is the energy required to break bonds in the products

A possible rate law for a third overall order of a reaction is __________________

• Rate = k [A]²[B]²

• Rate = k [A][B]³

• Rate = k [A]³ [B]

• Rate = k [A]²[B]

Tags

NGSS.HS-PS1-5