UNIT 5 : KINETICS - QUIZ

A kinetics experiment is set up to collect the gas that is generated when a sample of chalk, consisting primarily of solid CaCO₃, is added to a solution of ethanoic acid, CH₃COOH. The rate of reaction between CaCO₃ and CH₃COOH is determined by measuring the volume of gas generated at 25°C and 1 atm as a function of time. Which of the following experimental conditions is most likely to increase the rate of gas production?

• 1. Decreasing the volume of ethanoic acid solution used in the experiment

• 1. Decreasing the concentration of the ethanoic acid solution used in the experiment

• 1. Decreasing the temperature at which the experiment is performed

• 1. Decreasing the particle size of the CaCO₃ by grinding it into a fine powder

Tags

Chemical Kinetics

Rate Laws

The data in the table at left were obtained for the reaction:

X + Y → Z.

Which of the following is the rate law for the reaction?

• 1. Rate = k[X]²

• 1. Rate = k[Y]²

• 1. Rate = k[X][Y]

• 1. Rate = k[X]²[Y]

• 1. Rate = k[X][Y]²

Tags

Chemical Kinetics

Match the following equations given in the "KINETICS" section of the A.P. Chemistry Exam's Equations Sheet to their title.

Groups:

(a) First Order Half Life

,

(b) Zeroth Order Integrated Rate Law

,

(c) First Order Integrated Rate Law

,

(d) Second Order Integrated Rate Law

• 
• 
• 
• 

SO₂Cl₂→ SO₂ + Cl₂

The decomposition of SO₂Cl₂ (shown above) is first order and has a rate constant of 2.90 x 10⁻⁴ s⁻¹.

1. If the reaction is carried out at the same temperature and the initial concentration of SO₂Cl₂ is 0.0225 M, what is the SO₂Cl₂ concentration after 865 s?

• 0.0175 M

• 0.2284 M

• 0.00250 M

• 0.01125 M

What is the integrated rate law for a first-order reaction?

• 1/[A] = kt + 1/[A]₀

• ln[A] = -kt + ln[A]₀

• 1/[A] = kt

• ln[A] = -kt

If the rate constant (k) for a first order reaction is 0.05 s⁻¹, what is the half-life of the reaction?

• 10 seconds

• 0.072 seconds

• 13.86 seconds

• 0.0346 seconds

What is the overall order of a reaction if the rate law is rate = k[A]²[B]?

• Zero order

• Third order

• Second order

• First order

What is the unit of the rate constant for a second-order reaction?

• M⁻¹

• M⁻¹s⁻¹

• s⁻¹

• M⁻²s⁻¹

Which of the following best identifies the rate constant k

for the reaction based on the information in the plot of ln[H₂O₂] versus time (t) ?

• k = ln[H₂O₂] at t=0s

• k = −(slope of plot)

• k = ln[H₂O₂] at t=500s

The graphs shown in the diagram indicate that reactant A is ________________ order.

• zero

• first

• second