1 / 28

Learning Log

Learning Log. Read “How it Works” on p. 377 of resource text and answer questions #1 and 2. Demos - Its all about pressure. Crushing can Card trick Egg in a flask. V. T. P. Ch. 10 & 11 - Gases. II. The Gas Laws (p. 313-322). Definition of Gas Laws. V. P. P. T. T. V.

abedi
Download Presentation

Learning Log

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Learning Log • Read “How it Works” on p. 377 of resource text and answer questions #1 and 2.

  2. Demos - Its all about pressure • Crushing can • Card trick • Egg in a flask

  3. V T P Ch. 10 & 11 - Gases II. The Gas Laws(p. 313-322)

  4. Definition of Gas Laws V P P T T V • Simple mathematical relationships between the volume, temperature, pressure and amount of a gas.

  5. A. Boyle’s Law P V PV = k

  6. A. Boyle’s Law

  7. A. Boyle’s Law P V • The pressure and volume of a gas are inversely related • at constant mass & temp PV = k

  8. A. Boyle’s Law • P1 = initial pressure • V1 = initial volume • P2 = final pressure • V2 = final volume • P1V1 = k and P2V2 = k; therefore, P1V1 = P2V2

  9. Practice Problem – Boyle’s Law • A sample of oxygen gas has a volume of 150. mL when its pressure is 0.947 atm. What will the volume of the gas be at a pressure of 0.987 atm if the temperature remains constant? • V2 = P1V1 = (0.947 atm)(150. mL O2) P2 0.987 atm =144 mL O2

  10. B. Charles’ Law

  11. B. Charles’ Law V T

  12. B. Charles’ Law V T • The volume and absolute temperature (K) of a gas are directly related • at constant mass & pressure

  13. B. Charles’ Law • T1 = initial temperature • V1 = initial volume • T2 = final temperature • V2 = final volume • V1 = k and V2 = k; therefore, T1 T2 V1 = V2 T1 T2

  14. Practice Problem – Charles’ Law • A sample of neon gas occupies a volume of 752 mL at 25 °C. What volume will the gas occupy at 50°C if the pressure remains constant? • V2 = V1T2 = (752 mL Ne) (323 K) T1 298 K =815 mL Ne

  15. Practice • Read p. 146-152 in workbook and complete problems #1-5 on pp. 149-150 and problems #1-3 on pp. 153-154.

  16. Learning Log • Read “How it Works” on p. 387 of resource text and answer questions #1 and 2.

  17. Charles’ Law Demonstration

  18. C. Gay-Lussac’s Law P T

  19. C. Gay-Lussac’s Law P T • The pressure and absolute temperature (K) of a gas are directly related • at constant mass & volume

  20. C. Gay-Lussac’s Law • P1 = initial pressure • T1 = initial temperature • P2 = final pressure • T2 = final temperature • P1 = k and P2 = k; therefore, T1 T2 P1 = P2 T1 T2

  21. Practice Problem – Gay-Lussac’s Law • The gas in an aerosol can is at a pressure of 3.00 atm at 25°C. Directions on the can warn the user not to keep the can in a place where the temperature exceeds 52°C. What would the gas pressure in the can be at 52°C? • P2 = P1T2 T1 P2 = (3.00 atm)(325 K) = 3.27 atm 298 K

  22. D. Combined Gas Law P1V1 T1 P2V2 T2 = PV T = k P1V1T2 =P2V2T1

  23. D. Combined Gas Law Boyle’s Law: P1V1T2 = P2V2T1 P1V1=P2V2 Charles’s Law: P1V1T2 = P2V2T1 V1T2 = V2T1 Gay-Lussac’s Law: P1V1T2 = P2V2T1 P1T2=P2T1

  24. E. Gas Law Problems • A gas occupies 473 cm3 at 36°C. Find its volume at 94°C. CHARLES’ LAW GIVEN: V1 = 473 cm3 T1 = 36°C = 309K V2 = ? T2 = 94°C = 367K T V WORK: P1V1T2 = P2V2T1 (473 cm3)(367 K)=V2(309 K) V2 = 562 cm3

  25. E. Gas Law Problems • A gas occupies 100. mL at 150. kPa. Find its volume at 200. kPa. BOYLE’S LAW GIVEN: V1 = 100. mL P1 = 150. kPa V2 = ? P2 = 200. kPa P V WORK: P1V1T2 = P2V2T1 (150.kPa)(100.mL)=(200.kPa)V2 V2 = 75.0 mL

  26. E. Gas Law Problems • A gas’ pressure is 765 torr at 23°C. At what temperature will the pressure be 560. torr? GAY-LUSSAC’S LAW GIVEN: P1 = 765 torr T1 = 23°C = 296K P2 = 560. torr T2 = ? P T WORK: P1V1T2 = P2V2T1 (765 torr)T2 = (560. torr)(309K) T2 = 226 K = -47°C

  27. E. Gas Law Problems • A gas occupies 7.84 cm3 at 71.8 kPa & 25°C. Find its volume at STP. COMBINED GAS LAW P T V GIVEN: V1=7.84 cm3 P1=71.8 kPa T1=25°C = 298 K V2=? P2=101.325 kPa T2=273 K WORK: P1V1T2 = P2V2T1 (71.8 kPa)(7.84 cm3)(273 K) =(101.325 kPa)V2 (298 K) V2 = 5.09 cm3

  28. Practice • Read pp. 154-160 and complete problems #1-3 on pp. 157-158 and #1-2 on p. 161.

More Related