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December 5, 2013

December 5, 2013. In your assigned seat working on the Do Now when the bell rings. IF I CANNOT HEAR THE MUSIC YOU ARE TOO LOUD. Turn in any late HW, Projects, etc. Pick up a White board, sock, and marker . Pick up Daily Handouts DO NOW (loose-leaf paper):

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December 5, 2013

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  1. December 5, 2013 In your assigned seat working on the Do Now when the bell rings. IF I CANNOT HEAR THE MUSIC YOU ARE TOO LOUD. Turn in any late HW, Projects, etc. Pick up a White board, sock, and marker. Pick up Daily Handouts DO NOW (loose-leaf paper): For each of the following systems, tell whether the reaction will shift to the left (reactant side), right (product side), or will experience no shift given the changes. 1. 3A + 2B ⇄ C + 2D + 20 kJ a) pressure is decreased b) temperature is raised c) D is removed from the system 2. A + B ⇄ 2C + D + 14.6 kJ a) pressure is increased b) temperature is lowered c) D is added to the system

  2. Quiz – 10 minutes • Good Luck!

  3. Tutoring TODAY 12-5 afterschool 2:30-3:30

  4. Academy Awards!!

  5. Homework Vocab column #1 and 2 * Study Post Lab Questions Due Tomorrow* *graded

  6. Week of 12-2-2013 12-2: Solutions Test 12-3: Equilibrium (HW: #4) 12-4: Equilibrium, Lab, Gas Laws intro (HW: Vocab #1, Lab questions due Friday) 12-5: Gas Laws (HW: Vocab #2, Study) Equilibrium Quiz 12-6: Energy/Thermochem Test Gas Laws (HW: Vocab #3, Solutions Test Corrections)

  7. Agenda 12-5 • Do Now • Quiz • House keeping • Video Intro Gas Laws • Pressure and Temp • Egg Demo • Gas Laws and Gas Characteristics scavenger hunt • Ideal gas law practice

  8. Objectives • Identify characteristics of ideal gases and real gases • Analyze gas examples to determine if real, ideal or both • Apply general gas solubility characteristics • Identify and describe the 5 gas laws

  9. Intro to Ideal Gas Laws Before : 1 thing you know from kinetics and equilibrium about gases During: 3 bullet points (most important) After: 1 thing you are excited to learn more about from the video http://www.youtube.com/watch?v=BxUS1K7xu30&list=PL8dPuuaLjXtPHzzYuWy6fYEaX9mQQ8oGr

  10. Pressure and Temperature

  11. Is caused by the collisions of molecules with the walls of a container is equal to force/unit area Pressure

  12. Converting Celsius to Kelvin Gas law problems involving temperature require that the temperature be in KELVINS! Kelvins = C + 273 °C = Kelvins - 273

  13. The Kelvin Scale

  14. Either of these: • 273 Kelvin (273 K) • 0 C Standard Temperature and Pressure“STP” • And any one of these: • 1 atm • 101.3 kPa • 14.7 lbs/in2 (psi) • 760 mm Hg • 760 torr

  15. Converting C  K  C Practice Problems 1) 250 Kelvin to Celsius 2) 339 Kelvin to Celsius 3) 17 Celsius to Kelvin

  16. Converting C  K  C • White board practice! (doc)

  17. Egg Demo

  18. Egg Demo • Why does the fire go out? • Is there any gas left in the bottle? • What remained constant in this demo? • What happened to our air particles in the flask when the fire was burning?

  19. GAS LAWS

  20. PV=nRT P= pressure in atm V = volume in liters n = moles R = proportionality constant = 0.08206 L atm/ mol·K T = temperature in Kelvins Ideal Gas Law Holds closely at P < 1 atm

  21. The Combined Gas Law The combined gas law expresses the relationship between pressure, volume and temperature of a fixed amount of gas.

  22. Boyle’s Law Pressure is inversely proportional to volume when temperature is held constant.

  23. A Graph of Boyle’s Law

  24. The volume of a gas is directly proportional to temperature, and extrapolates to zero at zero Kelvin. Charles’s Law Temperature MUST be in KELVINS!

  25. A Graph of Charles’ Law

  26. Gay Lussac’s Law The pressure and temperature of a gas are directly related, provided that the volume remains constant. Temperature MUST be in KELVINS!

  27. A Graph of Gay-Lussac’s Law

  28. For a mixture of gases in a container, PTotal = P1 + P2 + P3 + . . . Dalton’s Law of Partial Pressures This is particularly useful in calculating the pressure of gases collected over water.

  29. Ideal vs Real Scavenger Hunt • Blue = Ideal • Green = Real • Purple = Both • Around the room find charactersitics of each type of gas. Using the key above put the correct characteristics in your t-chart.

  30. Review Ideal vs. Real

  31. Ideal Gas Law Practice • Doc

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