Energy Distribution Diagrams

What does the x-axis represent in an energy distribution diagram?

• Time

• Number of particles

• Energy of particles

• Temperature

What does the area under the energy distribution curve represent?

• The activation energy

• The energy of the system

• The number of reacting particles only

• The total number of particles

In an energy distribution diagram, what does the peak of the curve represent?

• The particles with the most energy

• The average energy of the particles

• The activation energy

• The number of particles with zero energy

What effect does increasing temperature have on the energy distribution curve?

• The curve shifts higher and narrows

• The curve becomes taller and steeper

• The curve flattens and shifts to the right

• The curve remains the same

How does a catalyst affect an energy distribution diagram?

• It lowers the peak of the curve

• It increases the area under the curve

• It shifts the curve to the left

• It does not affect the curve

On an energy distribution diagram, what does the shaded area to the right of the activation energy represent?

• Unreactive particles

• The most common particle energy

• Particles with enough energy to react

• Products of the reaction

Which of the following best explains why increasing temperature increases reaction rate?

• It increases the mass of reactants

• It lowers the activation energy

• More particles have energy greater than or equal to the activation energy

• It shifts the position of equilibrium

Which of the following statements about energy distribution is true?

• All particles have the same kinetic energy

• No particles have energy greater than the average

• Only particles at the peak can react

• Some particles always have very high or very low energy

At higher temperatures, the number of particles with energy below the activation energy...

• Increases

• Decreases

• Stays the same

Why does a small increase in temperature cause a large increase in reaction rate?

• The average energy doubles

• Many more particles exceed the activation energy

• The products become more stable

• The concentration of reactants increases