This question is about the Maxwell–Boltzmann distribution of molecular energies in a sample of a gas shown in the figure below.

What does the area under the curve represent?

• The total energy of the particles.

• The total number of particles.

• The number of particles that can react with each other.

• The total number of particles that have activation energy.

The Maxwell–Boltzmann distribution of molecular energies in a sample of gas at a fixed temperature is shown.

Which letter represents the average energy of the molecules?

• A

• B

• C

• D

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

The diagram shows the Maxwell−Boltzmann distribution of molecular energies in a gas at two different temperatures.

Which letter represents the average energy of the molecules at the higher temperature?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

The question below is about the Maxwell–Boltzmann distribution shown for a sample of a gas, X, at two different temperatures.

Which statement is correct for the higher temperature?

• The number of molecules lacking the E_a decreases.

• The total number of molecules increases.

• The activation energy decreases.

• More molecules have the average kinetic energy.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-2

The graph below shows a typical energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.

Which of the following statements is true?

• Position A represents the number of molecules which would produce an effective collision.

• Addition of a catalyst moves the position of E_A to the right.

• The area under the curve to the right of E_A represents the number of molecules with enough energy to react.

• The position of the peak of the curve at a higher temperature is further away from both axes.

Tags

NGSS.HS-PS3-4

When temperature increases by 10^oC, the rate approximately doubles. Why?

• Collisions become more frequent

• Collision rate increases and more particles have E_a

• More particles have E_a when they collide

• Collisions become more energetic

Tags

NGSS.HS-PS1-5