Diffusion Gizmo Answer Key

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Question and Answer – Student Exploration: Diffusion

  1. Describe the motion of the gas particles?

Answer: They bounce around everywhere

  1. Over time, what is happening?

Answer: The purple dots are spreading everywhere

  1. Please select the bar chart tab and then check the chart for several minutes. Once the first 30 seconds or more, how much do numbers of particles in each region alter?

Answer: It went from 50 in x in to 35. 15 went to x In B

When the numbers do not change much, the particles are said to be in dynamic equilibrium.

  1. Please click pause, and choose the GRAPH tab. What does the graph inform you about the number of particles in region A?

Answer: It was decreasing

Question and Answer: How Does Temperature Affect The Rate Of Diffusion?

  1. Observe: Set the temperature to 100 K, and press Play. Please observe the motion of particles. Click Reset. Then, you are able to set the temperature to 600 K, click Play, and observe.

How does temperature of the gas will relate to the motion of particles?

Answer: temperature does not affect it too much. It kind of foes at the same pace.

For your information, Kinetic energy (KE) depends on the velocity and mass of the particles (KE = mv2 / 2).

  1. Form hypothesis: How do you think temperature will affect the rate of diffusion?

Answer: We do not think it is going to affect the rate of diffusion.

  1. Experiment: Click Reset. Then, you have to set the Wall to 50%, y in B to 0, x in A to 100, Temperature to 100 K, and Particle mass to 15. Choose the TABLE tab. Press Play. Simply, you are able to click Pause when x in A first reaches 55% or below. Then, record this Time to reach equilibrium in the left table below.  Please repeat four more times at 100 K, and then run five trials with the temperature set to 600 K.

Temp = 100 K experiment

  • Trial 1: Time to reach equilibrium is 215 sec
  • Trial 2: Time to reach equilibrium is 238 sec
  • Trial 3: Time to reach equilibrium is 277 sec
  • Trial 4: Time to reach equilibrium is 230 sec
  • Trial 5: Time to reach equilibrium is 209 sec

Temp = 600 K experiment

  • Trial 1: Time to reach equilibrium is 100 sec
  • Trial 2: Time to reach equilibrium is 155 sec
  • Trial 3: Time to reach equilibrium is 87 sec
  • Trial 4: Time to reach equilibrium is 108 sec
  • Trial 5: Time to reach equilibrium is 140 sec
  1. Calculate: Discover the average time to reach equilibrium for each experiment:

Average time to achieve equilibrium at 100 K:

Answer: About 210 sec

Average time to achieve equilibrium at 600 K:

Answer: About 90 sec

  1. Draw conclusions: Please compare the average times to reach equilibrium for each temperature.
  2. How did temperature affect the rate of diffusion?

Answer: The higher temperature the less amount of seconds it took to reach equilibrium and vice versa.

  1. Why do you think that was the case?

Answer: The higher the temperature the better it was for things to reach equilibrium.

  1. Extend your thinking: Why do you think experimental results were different for each trial?

Answer: It is not going to be the same each time it has to be different because they are going in all kinds of directions and they are not going in the same path each time.

  1. On your own: In our lives, we rarely experience temperatures which are above 373 K or below 273 K. How much diffusion rates differ between those two temperatures? Please describe the results of your experiments.

Answer: Diffusion rates are going to differ by a lot each time because of how low or how high the k is.

Question and Answer: How Do Factors Other Than Temperature Affect The Rate Of Diffusion? 

  1. Select a variable: Pick a variable to investigate. Which one did you select?

Answer: Particle mass

  1. Form hypothesis: How do you think this variable will affect the rates of diffusion?

Answer: The particle mass is going to infect it a lot by making it either harder for them to pass easier. It would make it easier when the mass is high and harder when the mass is low.

  1. Set up experiment: In a controlled experiment, just one variable is manipulated, or changed. Please set up your experiment so that there is only one difference between set-up A and set-up B. List the Gizmo settings you are going to use for each set-up below

Set-up A

  • Wall: 50%
  • X in A: 100
  • Y in B: 100
  • Temperature: 600
  • Particle mass: 10

Set-up B

  • Wall: 50%
  • X in A: 100
  • Y in B: 100
  • Temperature: 600
  • Particle mass: 10
  1. Collect data: Please use Gizmo to fill in each table. For your information, the time to get equilibrium is the time it takes for number of x particles in region A

Set-up A

  • Trial 1: Time to reach equilibrium is 297 sec
  • Trial 2: Time to reach equilibrium is 297 sec
  • Trial 3: Time to reach equilibrium is 252 sec
  • Trial 4: Time to reach equilibrium is 196 sec
  • Trial 5: Time to reach equilibrium is 242 sec

Set-up A

  • Trial 1: Time to reach equilibrium is 530 sec
  • Trial 2: Time to reach equilibrium is 530 sec
  • Trial 3: Time to reach equilibrium is 493 sec
  • Trial 4: Time to reach equilibrium is 392 sec
  • Trial 5: Time to reach equilibrium is 445 sec
  1. Calculate: Please discover the average time to get equilibrium for each experiment:

Average time to get equilibrium for set-up A:

Answer: About 190 sec

Average time to get equilibrium for set-up B:

Answer: About 390 sec

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