Maxwell-Boltzmann distribution

In examining the Maxwell-Boltzmann distribution curves at different temperatures on the graph below, which variable in the graph remains the same?

• the area under each curve

• the average kinetic energy of the particles 

• the temperature in ^oC

• the height of each peak 

Tags

NGSS.HS-PS3-2

How will the presence of a catalyst affect the Maxwell Boltzmann distribution curve below?

• The shape of the curve shifts to the right, increasing the fraction of particles that have energy equal to, or greater, than the activation energy.

• The shape of the curve remains the same, but the activation energy shifts to the left, increasing the fraction of particles that have energy equal to, or greater, than the activation energy.

• The shape of the curve remains the same, but the level of activation energy shifts to the right, increasing the fraction of particles that have energy equal to, or greater, than the activation energy.

• The shape of the curve shifts to the left, increasing the fraction of particles that have energy equal to, or greater, than the activation energy.

Tags

NGSS.HS-PS1-4

Examine the Maxwell Boltzmann distribution curve below.

A decrease in temperature will shift the peak of the curve in which direction?

(a)  

The following Maxwell-Boltzmann distribution curve is for a variety of different gases at the same temperature.

Identify the correct statement about this graph.

• The graph shows that, as the molar mass of the gas decreases, the average molecular speed decreases. All of these gases have the same amount of kinetic energy.

• The graph shows that, as the molar mass of the gas increases, the average molecular speed decreases. All of these gases have the same amount of kinetic energy.

• The graph shows that, as the molar mass of the gas increases, the average molecular speed decreases. These gases do not have the same amount of kinetic energy.

• The graph shows that, as the molar mass of the gas decreases, the average molecular speed decreases. These gases do not have the same amount of kinetic energy.

Tags

NGSS.HS-PS3-2

Which of the following graphical representations best represents the distribution of kinetic energy among particles in any system with and without a catalyst added?

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Tags

NGSS.HS-PS3-2

Which of the following pairs of Maxwell–Boltzmann distribution curves best represents the distribution of kinetic energy for particles at two different temperatures?

Note: dashed line = higher temperature, solid line = lower temperature.

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Maxwell-Boltzmann distribution curves provide information about the distribution of kinetic energy among particles in a system. Which of the following graphical representations best represents the distribution of kinetic energy among particles in any system?

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Tags

NGSS.HS-PS3-4

In the Maxwell-Boltzmann distribution of kinetic energies in a sample of gas at a particular temperature, the area under the curve represents which of the following?

• the total energies of all the particles in the sample

• the total number of particles in the sample

• the total volume of the gas

• the total mass of the gas

Tags

NGSS.HS-PS3-2

On a Maxwell-Boltzmann distribution curve, the area under the curve is proportional to the number of (a)   . 

Tags

NGSS.HS-PS3-2

Consider a reaction mixture consisting of 1 mol of gaseous iodine and 1 mol of hydrogen at 200 °C. The experiment is then repeated at 300 °C.

Which of the following statements is consistent with comparisons between the Maxwell-Boltzmann distributions for this reaction mixture at these two temperatures?

• The area under the curve is greater for the reaction at 300 °C

• The area under the curve is smaller for the reaction at 200 °C

• The peak of the curve flattens and the curve extends towards higher energies for the reaction at 300 °C

• The peak of the curve becomes sharper and the curve retreats towards lower energies for the reaction at 300 °C.

Tags

NGSS.HS-PS1-5