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WARM-UP (5 MINUTES)

WARM-UP (5 MINUTES). Review your handouts, notes and textbook (page 413-417) on Factors Affecting Gas Pressure. GET READY FOR YOUR WRITTEN QUIZ FOR LT4A (10 MINUTES). WRITTEN QUIZ (10 MINUITES). Please write your name, period and date.

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WARM-UP (5 MINUTES)

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  1. WARM-UP (5 MINUTES) • Review your handouts, notes and textbook (page 413-417) on Factors Affecting Gas Pressure. • GET READY FOR YOUR WRITTEN QUIZ FOR LT4A (10 MINUTES)

  2. WRITTEN QUIZ (10 MINUITES) • Please write your name, period and date. • In the Gradecam answer form, use pencil only to write down your Student ID (5 digits) in the space provided and shade. • If can not remember your Student ID let me know. I will help you to look it up.

  3. GAS LAWS • Take out a new note sheet for this lesson.

  4. Remember the pressure equivalences for • one atmosphere: • 101.3 kPa • 14.7 psi • 760 mm of Hg • 760 torr • Gas volume may be in any volume units: m3, L, mL, dm3, ft3, yd3, gallons, pints, quarts, etc.

  5. Boyle’s Law • Proposed by Robert Boyle in 1662

  6. The volume of a gas is inversely proportional to the pressure. This is a statement of Boyle’sLaw. V2 = V1P1/P2 Both volumes should be in the same units and both pressures must also. This says that if we decrease the pressure on a gas, the volume will... increase Boyle’s Law: Pressure & Volume

  7. Boyle’s Law Simulation

  8. Warm-Up • Use Kinetic Molecular Theory (KMT) of gases to explain Boyle’s law • Reference Pages 385 and 418 of PHC

  9. Team Discussion and Sharing • Use Kinetic Molecular Theory (KMT) of gases to compare and contrast Seahawks Vs Broncos play-out in the Super Bowl XLVIII

  10. Lab Activities • Take out a new note sheet and write down your name, period, date, and title. • Read the lab handout carefully and follow directions to complete the lab activities. • Experimenter(s) • Recorder • Lab protocol manager

  11. Homework : Lab activities • Answer all the post-lab questions • Use a paper graph sheet to plot a graph of volume vs Pressure/number of books due 2/18/2014 (in class) • Use Microsoft Excel Spreadsheet to plot a graph of Pressure/number of books vs 1/volume Due 2/17/ 2014 Attach and send to my email: pchikwe@lion.lmu.edu

  12. WARM-UP • SUBMIT YOUR LAB HOMEWORK: • PAPER GRAPH (VOLUME Vs PRESSURE) • ANSWERS TO POST LAB QUESTIONS • ERROR ANALYSIS OF THE WRITTEN QUIZ LT4A • MAKE NOTE OF WHY YOU DIDN’T GET FULL CREDIT OF THE QUESTION

  13. ERROR ANALYSIS Your reason would probably be: • Typographical errors (I knew the answer but for some reason didn’t mark it correctly) • Careless mistakes (I should have know the answer but read the question so quickly an important word was skipped or some similar error related to work habits) • Misconception (I thought I knew the answer but was mistaken in my understanding) • Lack of knowledge (I truly did not know: sometimes phrased as “I had no clue”)

  14. ACTION PLAN • Come up with a specific plan of what you are going to study to be well rounded on the factors affecting gas pressure and KMT of gases. • UNIT EXAM 1 DUE MONDAY 2/24/2014 (15 QUESTIONS FOR 30 MINS) • HW: UNIT 1 REVIEW : 10 MINS VIDEO CLIP WILL BE POSTED ON THURSDAY 2/20/14 • LT4C LAB ACTIVITIES: HOT BALLOON DUE MONDAY 2/24/14 • LT4B LAB ACTIVITIES: BOYLE’S LAW LAB EXCEL DATA/GRAPH DUE THIS MIDNIGHT

  15. Reviewing KMT of Gases 1. Gas molecules move randomly in straight lines 2. The collision of gas molecules are perfectly elastic 3. The actual volume occupied by the gas molecules themselves is negligible 4. The cohesive forces between the gas molecules are negligible 5. The temperature of the gas is a measure of the average kinetic energy of the gas molecules.

  16. Inverseproportions like Boyle’s Law have a graph shaped something like this: V P Boyle’s Law: Pressure & Volume

  17. Clues solving Boyle’s Law • A gas is involved • You have two volumes and two pressures • At constant/fixed temperature • All volumes units must be the same • All pressure units must be the same FYI:1atm=101.3kPa=760mmHg=760torr=14.7psi

  18. Some helium gas occupies 6.1 cubic decimeters (dm3) when the pressure is 105 kPa. Find its volume if the pressure is 167 kPa (and nothing else changes). Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. V2 = P1V1/P2 V2 = (6.1 dm3)(105 kPa)/(167 kPa) V2 = 3.8 dm3 Boyle’s Law: Pressure & Volume

  19. Some ethane gas occupies 1.44 L when the pressure is 0.794 atm. At what pressure will it occupy 1.688 L at constant temperature? Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. P2 = V1P1/V2 P2 = (1.44 L)(0.794 atm)/(1.688 L) P2 = 0.677 atm Boyle’s Law: Pressure & Volume

  20. The pressure of a gas is 44 kPa when the volume is 10. L. What is the pressure if the volume is changed to 20. L at constant temperature?. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. P2 = P1V1/V2 P2 = (44 kPa)(10. L)/20. L) P2 = 22 kPa Boyle’s Law: Pressure & Volume

  21. Some helium gas occupies 44.6 gallons at 356 mm of Hg. Find the volume of the gas at 777 mm of Hg if the temperature does not change. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. P1V1 = P2V2 V2 = P1V1/P2 (356 mm) (44.6 gal) V2 = --------------------- 777 mm V2= 20.4 gal Boyle’s Law: Pressure & Volume

  22. At 760. mm of Hg, some NO2 gas occupies 113 L. Find its volume at 1020 mm Hg and the same temperature. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. P1V1 = P2V2 V2 = P1V1/P2 (760. mm) (113 L) V2 = ------------------------ 1020 mm V2 = 84.2 L Boyle’s Law: Pressure & Volume

  23. Some helium gas occupies 64.0 m3 at 500. mm of Hg. At what pressure will it occupy 96.0 m3 if the temperature does not change. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. P1V1 = P2V2 P2 = P1V1/V2 P2 = ------------------- P2 = 333 mm Hg (500. mm) 64.0 m3 96.0 m3

  24. Some methane gas occupies 125 L at 101.5 kPa. Find its volume at 165.0 kPa if the temperature remains the same. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. V2 = V1P1/P2 V2 = (125 L)(101.5 kPa)/(165.0 kPa) V2 = 76.9 L Boyle’s Law: Pressure & Volume

  25. Some argon gas has a volume of 49.8 L at 675 torr. Find the pressure at which it will occupy 23.0 L if the temperature remains constant. Rationale?... We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. P1V1 = P2V2 P2 = P1V1/V2 P2 = -----------==-------- P2 = 1460 torr (675 torr) (49.8 L) 230 L

  26. Some ethane gas occupies 175 L at 1.00 atmospheres. Find its volume at 3.00 atmospheres if the temperature remains the same. Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. V2 = V1P1/P2 V2 = (175 L)(1.00 atm.)/(3.00 atm) V2 = 58.3 L Boyle’s Law: Pressure & Volume

  27. Some gaseous ether occupies 220. L at 1.00 atmospheres. Find its volume at 3040 mm Hg if the temperature remains the same. (Use 760 mm/atm)Rationale?… We know to use Boyle’s Law, since we have a gas, 2 P’s & 2 V’s. V2 = V1P1/P2 V2 = (220. L)(1.00 atm.)/[3040 mm/(760 mm/atm.)] V2 = 55.0 L Boyle’s Law: Pressure & Volume

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