Chemistry lab worksheet

Anonymous
timer Asked: Nov 24th, 2018
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Question description

I just posted the simulation for this weeks lab Behavior of Gases SIMULATION Please print it off, follow the directions and answer the questions. ( please label every question and answer them In order so I can follow them as well. please use word for answers including tables and graphs if found)

NAME:_______________________ DATE:_______________________ LAB INSTRUCTOR:_______________________ Lab Exercise 11 - Simulation Behavior of Gases: Finding the Molar Mass of a Fictitious Gas Using Temperature and Average Velocity OBJECTIVES • Determine the molar mass of a fictitious gas in a simulation • Learn the relationship between temperature and kinetic energy INTRODUCTION The molecules of matter at ordinary temperatures can be considered to be in ceaseless, random motion at high speeds. The average translational kinetic energy for these molecules can be deduced from the Boltzmann distribution. Knowing the velocity and the temperature of these molecules at different temperatures will allow us to calculate a value for the Molar Mass. The Boltzmann distribution of energies can be broken down to relate average velocities to temperature using the following relation: 3 1 kT = mv 2 2 2 k = 1.38 x 10-23 J/K T in Kelvin m of a single particle in kg v in m/s We can eliminate the 1/2 factor by multiplying both sides by 2 giving us: 3kT = mv 2 y = mx + b You can see how this equation can be viewed and plotted as a linear relationship with v2 as the x-axis and 3kT as the y-axis. PROCEDURE A. Go to the University of Colorado website for science simulations: phet.colorado.edu. 1. Click on the “Play with Simulation” button. 2. Click on “Chemistry” 3. Find the lab the says “Gas Properties” and click on it. 4. You can either use the simulation online or download it as a .jar (Java archive) file. If you click to play and you get a blank screen, you will need to download it. 5. Open the .jar file and run it. If you need to install Java on your computer you can do so here https://java.com/en/download/manual.jsp. You may need to restart your computer Page 1 of 4 after installing. You may also get a message about the developer and it won’t open. If this happens, just hold down Control and click to open the file, then open it. B. SETTING UP THE EXPERIMENT 1. Click on “Volume” as your Constant Parameter. 2. Click on “Measurement Tools”, then select “Species Information” 3. Click on “Advanced Options” and deselect “Molecules Collide” 4. Record your data from the experiment in the table below for Temperature, Pressure, and Average Speed Heavy Species T(K) Pressure (atm) Average Speed (m/s) Light Species T(K) Pressure (atm) Average Speed (m/s) C. RUNNING THE EXPERIMENT 1. Use the pump handle to pump in between 300 and 600 particles. This is shown in the right-hand panel. 2. Record the values for the Temperature, Pressure, and Average Speed in your table above. Average Speed is shown in the pop-up window. 3. Use the Heat Control to raise or lower the temperature and record at least 4 additional data points with a total temperature range of at least 500K between the lowest and highest temperatures and at least two below room temperature (300K) 4. Once you are finished recording your data points, click on the “Reset” button to begin a new experiment. (You may need to close the Measurement Tools to find the reset button). 5. Choose the “Light Species” for the Gas in Pump, and repeat steps 1 - 4. Be sure to choose at least one temperature in this series of measurements that is the same as the first series Page 2 of 4 D. DATA ANALYSIS 1. Plot your data with v2 as the x-axis and 3kT as the y-axis as explained in the Introduction for your heavy species and attach to your report. 2. Find the mass of a single particle in kg, and the mass of one mole of particles in g/mol. Show your calculations below. (Note: You will need to find the slope of your line. To find the slope of your line to more than one significant figure in Excel you may need to use the SLOPE function. In a cell type =SLOPE(range of y-values),(range of x-values)) 3. Repeat your analysis for the light species. E. QUESTIONS 1. What is the relationship between temperature and average velocity? Page 3 of 4 2. Using the two measurements that were at the same temperature for the two species, how did the average velocity compare between the heavy and light particles? Explain why this is. 3. How did the pressure respond to the changes in temperature? Explain the reason for this Page 4 of 4

Tutor Answer

mickeygabz
School: Cornell University

See attached

NAME:_______________________
DATE:_______________________
LAB INSTRUCTOR:_______________________

Lab Exercise 11 - Simulation
Behavior of Gases: Finding the Molar Mass of a Fictitious
Gas Using Temperature and Average Velocity
OBJECTIVES

• Determine the molar mass of a fictitious gas in a simulation
• Learn the relationship between temperature and kinetic energy
INTRODUCTION

The molecules of matter at ordinary temperatures can be considered to be in ceaseless,
random motion at high speeds. The average translational kinetic energy for these molecules
can be deduced from the Boltzmann distribution. Knowing the velocity and the temperature of
these molecules at different temperatures will allow us to calculate a value for the Molar Mass.
The Boltzmann distribution of energies can be broken down to relate average velocities to
temperature using the following relation:

kT = mv2

k = 1.38 x 10-23 J/K
T in Kelvin
m of a single particle in kg
v in m/s

We can eliminate the 1/2 factor by multiplying both sides by 2 giving us:

3kT =mv2
y = mx + b
You can see how this equation can be viewed and plotted as a linear relationship with v2 as the
x-axis and 3kT as the y-axis.
PROCEDURE

A. Go to the University of Colorado website for science simulations: phet.colorado.edu.
1. Click on the “Play with Simulation” button.
2. Click on “Chemistry”
3. Find the lab the says “Gas Properties” and click on it.

Page 1 of 5

4. You can either use the simulation online or download it as a .jar (Java archive) file. If you
click to play and you get a blank screen, you will need to download it.
5. Open the .jar file and run it. If you need to install Java on your computer you can do so
here https://java.com/en/download/manual.jsp. You may need to restart your computer
after installing. You may also get a message about the developer and it won’t open. If
this happens, just hold down Control and click to open the file, then open it.

B. SETTING UP THE EXPERIMENT
1. Click on “Volume” as your Constant Parameter.
2. Click on “Measurement Tools”, then select “Species Information”
3. Click on “Advanced Options” and deselect “Molecules Collide”
4. Record your data from the experiment in the table below for Temperature, Pressure, and
Heavy Species

T(k)

Pressure (atm)

Average Speed(m/s)

554

300

1.08

476.48

554

100

0.36

275.04

554

200

0.72

388.56

554

500

1.81

614.92

554

700

2.53

727.99

Light Species

T(k)

Pressure (atm)

Average Speed(m/s)
...

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Anonymous
Top quality work from this guy! I'll be back!

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