Exploring the Behavior of Gases

Exploring the behavior of Gases Name: _______________________ Date: ________ Get Started: Click on this link to open the gas simulation Part I 1. Go to intro. Choose only one type of particle. 2. Record the pressure, temperature and volume. 3. Give one pump of gas and observe the behavior. How would you describe this? Record the pressure, temperature and volume. pressure-2.5 atm temp-300k 4. Hold volume and temperature constant and give one more pump. Record the number of particles and the pressure in the data table below. Describe what you saw. Repeat this a few times, either increasing or decreasing the number of the same type of particles. Number of particles 50 75 100 Pressure (atm) 5.8 9.1 11.6 125 15.2 150 19.5 5. Is there a relationship between the number of particles and the pressure? Briefly describe this. the more particles there are the pressure also rises. What is the pressure in the container due to? (what assumption are we making?) the more particles in the container the more the pressure goes up. 1 1/5 Part II: There are 3 parameters that need to be specified when describing a specific quantity of a gas. They are: Pressure, Volume and Temperature. We will keep the number of particles constant in each “experiment” and explore the effect (if any) a change in any of these parameters may have on the behavior of the gas. Choose the Laws option on the right. See picture Experiment 1- Volume 1. Give one pump of gas into the chamber. 2. Choose to hold the volume constant by selecting that option in the upper right-hand corner. See the picture. What is the initial temperature (in K) and pressure (in atm) in the chamber? 5.8atm 3. Use the slider at the bottom of the simulator to add heat and double the temperature. Did the pressure go up or go down? What is the new pressure in the chamber? the pressure rose up to 11.7atm 4. Keeping the volume constant (and the number of particles constant), change the temperature and record the pressure. Repeat 4 times and record your data. Sketch a graph to the right of the table. Be sure to give a title to your graph and label the axis completely. pressure Independent variable is : _________________ temperture Dependent Variable: ____________________ Constants: ____________________________ volume Temperature (K) Pressure (atm) 600 11.7 atm 550 10.7 500 9.7 450 8.7 7.8 400 Describe the graph and relationship: pressure(atm) 12 10 8 6 4 2 400 450 500 550 2 600 temperture (k) 2/5 Experiment 2 - Temperature 1. Reset the simulator by selecting the reset button in the bottom right corner of the simulation. 2. Give one pump of gas into the chamber. 3. Choose to hold the temperature constant by selecting that option in the upper right-hand corner. See the picture. What is the initial pressure (in atm) in the chamber? 4.2 atm 4. Locate the handle on the left of the chamber and slide it to the right as far as it will go. What units are used to measure the width of the chamber? _________ nm^3 down Does the volume go up or go down when you slide it to the right? _______, Did the pressure go up or go down? __________; Why? up there is less space for the particles so the pressure will increase due to more tension that builds up in a smaller container. 5. Slide the handle all the way to the left as far as it will go. down Did the pressure go up or go down? _____________; Why? becuase the volume increased creating more space for the pressure to relase. 6. Keeping the temperature constant (and the number of particles constant), change the volume and record the pressure. Repeat 4 times and record your data. Sketch a graph to the right of the table. Be sure to give a title to your graph and label the axis completely pressure Independent variable is : _________________ volume Dependent Variable: ____________________ temperture Constants: ____________________________ Volume (nm3) 10.0 11.0 12.0 13.0 14.0 Pressure (atm) 5.9 5.3 4.9 4.5 4.2 Describe the graph and relationship: volume (nm³ 15 10 5 1 2 3 4 5 6 3 pressure(atm) 3/5 Experiment 3 - Pressure 1. Reset the simulator by selecting the reset button in the bottom right corner of the simulation. 2. Give one pump of gas into the chamber. 3. Choose to hold the pressure constant by selecting that option in the upper righthand corner. See the picture. What is the initial temperature (in K) in the chamber?___________ 4. Use the slider at the bottom of the simulator to add heat and increase the temperature. up Did the volume go up or go down? _____________ 5. Keeping the pressure constant (and the number of particles constant), change the temperature and record the volume. Repeat 4 times and record your data. Sketch a graph to the right of the table. Be sure to give a title to your graph and label the axis completely volume Independent variable is : _________________ Dependent Variable: ____________________ temperture Constants: ____________________________ Temperature (K) Volume (nm3) 150 10 temperture (k) Describe the graph and relationship: 4 4/5 Analysis In each of the experiments, you hold one parameter constant while changing the other 2. Summarize the findings of your experiments by using arrows ( or ) to represent what happened. Experiment 1: When temperature went ________,upthe pressure went _________. Possible reason? up Real world example? down Experiment 2: When volume went ________, the pressure went _________. up Possible reason? Real world example? up Experiment 3: When temperature went ________, the volume went _________. Possible reason? up Real world example? 5 about:blank 5/5