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Week 33 Chemistry

Week 33 Chemistry. Gas Laws. Write the Learning Target. Warm Up: 4 Minutes. Stay in your own seat. You should be working SILENTLY.

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Week 33 Chemistry

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  1. Week 33 Chemistry Gas Laws

  2. Write the Learning Target Warm Up: 4 Minutes Stay in your own seat You should be working SILENTLY If the pressure of a tire is over 35 psi, it is likely to explode. If the initial pressure of a tire is 32.5 psi at 15 ºC, calculate the new pressure at 40 ºC. Is the tire likely to explode at 40 ºC?

  3. This is the passing rate

  4. How to improve your grade • Turn in missing assignments (this is the biggest issue right now) • Make up Missed Exams • Come to tutorials for extra help

  5. Agenda • Warm Up: 7 Minutes • Combined Gas Law Video: 15 Minutes • Guided Practice: 13 Minutes • Independent Practice: 15 Minutes • Closing: 3 Minutes

  6. Combined Gas Law Video • Go to shschem.weebly.com (our class website) Bookmark this if you haven’t done so already!!! • Hover over my page: Mr. Ghosh  Video Lessons • Watch video for April 28 • Take notes on your handout

  7. Let’s Review our Gas Laws P1V1= P2V2 Boyle’s Law Charles Law G. Lussac’s Law

  8. Putting them all together… # of Moles This is the Combined Gas Law

  9. Problem Solving Tip • Begin all problems using the Combined Gas Law • If any variables (P, V, n, or T) are not present, delete them from both sides of the equation • Substitute and solve using remaining values Example: Problem has Pressure and Temperature, but no Volume or Moles

  10. Example 1 The initial pressure, temperature, and volume of a car tire are 33 psi, 25 ºC, and 4.8 L. If the temperature outside rises to 35 ºC and the volume expands to 5.0 L, what is the new pressure inside the tire?

  11. Example 2 3.2 moles of gas have a volume of 800.0 mL at -23 ºC. How many moles of gas would be present in 675.0 mL at 227.0 ºC?

  12. Guided Practice • Take 13 seconds to study the problem. • When Mr. Ghosh indicates that you can talk, take 48 seconds to work the problem with your teammates. • When Mr. Ghosh says SWAG, be ready to share and explain your answers.

  13. Guided Practice #1 A toy balloon contains 3 moles of gas at an internal pressure of 1.05 atm and a volume of 5.0 L. If the initial temperature of the balloon is 20 ºC, what will the volume of the balloon be if it rises to an altitude where the pressure is 0.65 atm and the temperature is -15 ºC? 7.11 L

  14. Guided Practice #2 A small research submarine contains gas with a volume of 1.2 x 105 L at a pressure of 1.0 atm and a temperature of 15 ºC. Assuming the number of moles remains constant, the submarine descends to a depth where the new volume is 767 L and the temperature is 3 ºC. What is the new pressure on the gas? 150 atm

  15. Guided Practice #3 If I initially have 4.0 L of a gas at a temperature of 38 ºC, what will the temperature be if I increase the volume to 5.0 L? 389 K

  16. Independent Practice Its time to see if you truly understand the Combined Gas Law. ..

  17. Closing • Which law relates P and V? • Which law relates V and T? • Which law relates P and T? • Which law relates P, V, n, and T?

  18. Write the Learning Target Warm Up: 4 Minutes Stay in your own seat You should be working SILENTLY The initial pressure, volume, and temperature a gas are 1 atm, 3.4 L, and 27 ºC. If the pressure increases to 3.2 atm, and the temperature rises to 79 ºC, what is the new volume?

  19. The initial pressure, volume, and temperature a gas are 1 atm, 3.4 L, and 27 ºC. If the pressure increases to 3.2 atm, and the temperature rises to 79 ºC, what is the new volume?

  20. Agenda • Warm Up: 7 Minutes • Ideal Gas Law Video: 15 Minutes • Guided Practice: 13 Minutes • Independent Practice: 15 Minutes • Closing: 3 Minutes

  21. Ideal Gas Law Video • Go to shschem.weebly.com (our class website) Bookmark this if you haven’t done so already!!! • Hover over my page: Mr. Ghosh  Video Lessons • Watch video for April 29 • Take notes on your handout

  22. Ideal Gas Perfect gases under perfect conditions

  23. IDEAL GAS LAWDESCRIBING THE BEHAVIOR OF IDEAL GASES PV= nRT P = pressure V = volume in LITERS n = moles R = gas constant T = temperature in KELVIN

  24. R

  25. Example 1 What is the volume of 0.25 moles of oxygen gas at 250 K and 360 mmHg?

  26. Example 2 How many moles of hydrogen would be contained in 6.0 L of the gas at 101.4 kPa and 64oC?

  27. Guided Practice #1 What is the temperature of 0.456 mol of gas at 1 atm if the gas is held in a 10.0 L container?

  28. Guided Practice #2 What volume is occupied by 1.23 moles of methane, CH4, at 27oC and 1.59 atm?

  29. Independent Practice Its time to see if you truly understand the Ideal Gas Law. ..

  30. Closing • What variables are needed to use the Ideal Gas Law equation?  

  31. Write the Learning Target Warm Up: 3 Minutes Stay in your own seat You should be working SILENTLY The pressure for an ideal gas is 72.8 kPa. If there are 4.6 moles in a 10.7 L container, calculate the temperature of the gas.

  32. Agenda • Warm Up: 7 Minutes • Ideal Gas Law Video: 15 Minutes • Guided Practice: 13 Minutes • Independent Practice: 15 Minutes • Closing: 3 Minutes

  33. Announcements • Gas Law Quiz  FRIDAY (Boyles, Charles, G. Lussac’s, Combined, Ideal) • Gas Law Exam  5/7

  34. Today you will need: • Calculator • Periodic Table

  35. Ideal Gas Law-Part 2 Video • Go to shschem.weebly.com (our class website) Bookmark this if you haven’t done so already!!! • Hover over my page: Mr. Ghosh  Video Lessons • Watch video for April 30 • Take notes on your handout

  36. Example 1 What is the volume of 22.0 g carbon dioxide (CO2) at 312 K and 795 mmHg?

  37. Uh oh… We are given grams…but “n” needs to be in moles. How do we go from grams to moles? Use Molar Mass!

  38. Review of Molar Mass

  39. Example 1 What is the volume of 22.0 g carbon dioxide (CO2) at 312 K and 795 mmHg?

  40. Example 2 How many grams of hydrogen gas (H2) would be contained in 5.35 L of the gas at 119.7 kPa and -29oC?

  41. Guided Practice #1 What is the temperature of 71.8 g nitrogen gas (N2) at 1 atm if the gas is held in a 10.0 L container?

  42. Guided Practice #2 What volume is occupied by 7.02 moles of sulfur dioxide, SO2, at 361oC and 14.07 atm?

  43. Independent Practice Its time to see if you truly understand the Ideal Gas Law. ..

  44. Closing • How does the ideal gas law relate P, V, n, and T?

  45. Write the Learning Target Warm Up: 4 Minutes Stay in your own seat You should be working SILENTLY An ideal gas is trapped in a closed container. The pressure inside the container is 634 mmHg. If there are 38 g H2 at 98 ºC, calculate the volume of the container.

  46. Agenda • Warm Up: 7 Minutes • Gas Law Stoichiometry Video: 15 Minutes • Guided Practice: 13 Minutes • Independent Practice: 15 Minutes • Closing: 3 Minutes

  47. Gas Law Stoichiometry Video • Go to shschem.weebly.com (our class website) Bookmark this if you haven’t done so already!!! • Hover over my page: Mr. Ghosh  Video Lessons • Watch video for May 1 • Take notes on your handout

  48. Remember this?

  49. It’s time to do… Gas Law Stoichiometry

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