GIA 9 PT A

art At Properties of Gases }; to0: https://phet.color; J ado.edu/sims/him| Las-properties/lates gas-properties en.him| . How Does the Pressure of 5 Gas Change? j. Choose “Ideal” then in the si mulation settings, click th to insure all parameters are a e E Reset button found at the bottom right t the original settings. () What is the initia] average Pressure when the gas chamber is empty? 0.0 atm b) Click on the + sign by Particles, then pump 40 of the heavy (blue) gas particles into the chamber (you can do this with the pump, or more precisely with the arrows in the right-side menuy). ¢) Locate the Heat Control at the bottom of the screen. Move the blue lever up and down to practice raising and lowering the temperature. d) Click fl or the Eraser to reset. Relationship between Pressure (P) and Volume (V) Select the heavy (blue) gas and pump 40 particles into the chamber (you can do this with the ump, Or more precisely with the arrows in the right-side menu). In the upper right hand menu, Eelect Temperature as the Constant Parameter. (a) Record the average Pressure: 4 . & atm and Temperature: 247 K (b) Select Width to view the width measurement on at the bottom of the chamber. (c) Now use the handle on the left side of the chamber to decrease the volume of the gas chamber c h by approximately half. What happens to the pressure? ‘a creased Explain the change in pressure in terms of the molecular-level interactions you observe in the cylinder. W o Ve The \esg Spac Yhe wote \QMM\%M Rugiow= Fra wove “P"u&JIL Il ; held constant. other variables are he \/ .& e ?« ‘ 91 T1F23 Sengler

Toles (N of gas 3. Relationship between Pressurc p) and M icles. then add 40 of the blue (heayy) o : t e + sign by Par el Parameter. Click m Reset button. Click on th e as the particles to the chamber. Select Temperatur 4. am Record the average initial pressure: e chamber (total of 80). Now add 40 more of the blue (heavy) gas particles 10 th A wrea&eS Explain the change in pressure in termg o 07 . (a) What happens to pressure: baerve in the cylinder. the molecular-level interactions you 0 Sooe W e, Aletog RSN, ° wa V13T S (b) Write an equation that describes the relationship between pressure and moles when q]) other variables are held constant. X =94 4. Relationship between Pressure and Temperature (T Click K&l Reset button. Click on the + sign by Particles, then add 40 of the blue (heavy) gas particles to the chamber. Choose Volume as the Constant Parameter. Record average initial pressure: 4.5 atm Use the Heat Control to add heat and raise the temperature to 600K. (a) What happens to pressure? _ “n tre3se§ Explain the change in pressure in terms of the molecular-level interactions you observe in the cylinder. \'<.W\\€ TnoRAYNE | whowe co\lss\ons = VN oVl “ GU&@M (b) Write an equation that describes the relationship between pressure and temperature when all other variables are held constant. : Thass CHMI101 F23 Sendler 92

7. Review your equations determined in 2 through 6 above to determine whether the f0110win relationships are proportional or inversely proportional. g | 4 Variables Directly or Inversely Proportional ol Pressure vs. Volume LN F Pressure vs. Moles Sirect Pressure vs. Temperature 3l Temperature vs. Volume Atre ok Moles vs. Volume A e r N Boyle's Law, Charles’ Law and Avogadro’s Law are based on these relationships you investigateq With the simulation. II. Kinetic Energy Click the tab for Energy. Click the + sign next to Particles. Click the + sign next to Injection Temperature and click Set to 300K. In _the Speed area click the boxes for both the red and blue particles. Click the + sign next to Kinetic Energy and click the boxes for both the red and blue particjeg 8. Add 300 of the blue (heavy) gas particles to the chamber. Record the average speed: oAy m/s Now add 300 of the lighter (red) gas particles to the chamber and wait 1 minute. 450 ' (a) Does the average speed of the blue particles increase, decrease, or remain relatively constant? P = — N COWANTDNX" ra (b) Does the speed distribution for the blue particles shown in the graph change (does the addition of the lighter red particles affect the average particle speed of the blue particles)? o (c) Which has the greater “average particle velocity” or speed, the heavy (blue) particles or the lighter (red) particles (or are they the same)? ved aft g (d) Which has the greater “average Kkinetic energy”, the heavy (blue) particles or the lighter (red) particles (or are they almost the same)? Y \\wW OS - SA N~ CHMI101 F23 Sendler 94

1 ¢ relationship between mass (m) and average velocity (vav) is given by the following equation: KE]\E = % m(“'\‘-): (¢) At constant temperature, the average kinetic energy (KEa\) is a constant. Is this what you observed in (d) above? e s (f) Is the relationship between mass (m) and average particle velocity squared (Vave)* more like a directly proportional or inversely proportional relationship? __ ¢ yevs@\M (2) How does this equation explain why the average particle velocity of helium and neon differ? (Hint: think about the mass and average particle velocity of each element.) Yhe eqcatow 333 P\ARE e difRenert 31208 iw velaWow Hhae Y s\eaesd . Apply the relationship you observed between Pressure and Volume in Question 2 to the following question: An air bubble rises through the ocean from a depth of 1000 feet to the surface. As it rises, the pressure decreases from 30 atm to 1.0 atm. Ata depth of 1000 feet, the volume of the bubble is 5.00 mL Assuming that the temperature of the gas inside the bubble does not change, and that it does not gain or lose mass, what is the volume of the bubble just before it reaches the surface (at 1 atm)? Show work and units. 5.,00wWA\ B3 Ao avw 230 1\ DO Sl = 1 In the previous question, we assumed no temperature change. If temperature of the bubble also increases as it rises to the surface, should the bubble be larger or smaller than the volume you calculated in the previous question? (Hint: think about the relationship between Volume and Temperature you found in Question 5.) Explain your answer. \‘a\rfigv N 3w v Ramap TurkASRS dve ‘o Vs wal\dRew SWip \eaXkemi oRANA | LTS AL Ve ee oo@y M'\'QM\-?. 95 U F23 Sendler