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Launch: Monday, January 14, 2013

Launch: Monday, January 14, 2013. At what temperature will 20.2 grams of CH 4, methane gas, exert a pressure of 1.8 atm in a 7,500 mL cylinder ? (hint: convert grams to moles before you begin). Announcements. Unit #4 Exam: TOMORROW!

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Launch: Monday, January 14, 2013

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  1. Launch: Monday, January 14, 2013 At what temperature will 20.2 grams of CH4, methane gas, exert a pressure of 1.8 atm in a 7,500 mL cylinder? (hint: convert grams to moles before you begin)

  2. Announcements Unit #4 Exam: TOMORROW! Monday:25 Multiple Choice, Vocab and 5 Free Response Check lpsroyalchemistry.com website and my Facebook for updates on Internet Review Session

  3. Standard Temperature and Pressure • A set of conditions set by scientists that allows for comparison of data and minimizes error • When you read STP, automatically write “0 OC and 1 atm”

  4. Absolute Zero • The theorized lowest possible temperature, at which there is no molecular motion • 0 Kelvin

  5. Gas Law Reminders • 1 atm = 760 mmHg • 1000 mL = 1 L • K = C + 273 • Grams  Moles

  6. Expectations: • Only chemistry • Both partners are responsible for the answer • Talking only loudly enough for your partner to hear you • Your board must be up before the song ends! • Keep your own score in the top right corner Names Score

  7. Gases Jeopardy

  8. Write a definition for the vocab word diffusion.

  9. Correct the statement below: “Gas molecules do not collide with other molecules or objects, but instead they bond together because of their attractive forces.”

  10. Define absolute zero.

  11. “When a cold tire is inflated to a certain pressure and then is warmed up due to friction with the road, the pressure increases.” • This happens because….

  12. At the temperature of absolute zero, what would the estimated pressure be, in atm?

  13. What type of relationship is between volume and temperature? What does this mean?

  14. If the volume of a confined gas is tripled while the temperature remains constant, what change (if any) would be observed in the pressure?

  15. A gas is a rigid container has it’s temperature cut in half, what change (if any) would be observed in the pressure?

  16. A gas is a flexible container, such as a balloon, has it’s temperature doubled from 100 K to 200 K, what change • (if any) would be observed in the volume?

  17. A 1.2 L balloon, which will pop if it has a volume greater than 2.0 L, starts at conditions of STP. It rises high into the sky so that the gas inside the balloon reaches temperature of -20 OC and .5 atm. Will the balloon explode?

  18. Initiallya gas occupies 16.0 L at 45°C. After undergoing a change, the volume was measured at 9.4 L. What was the final gas of the temperature, in K, cooled to?

  19. If I have 6.0 liters of gas in a piston at a pressure of 2.5 atm and compress the gas until its volume is 3.7 L, what will the new pressure, in mmHg, inside the piston be?

  20. The air in a dry, sealed 2.3 L soda bottle is at STP. What will be its pressure if it is brought to a higher altitude where the temperature is only 23ºC?

  21. The pressure of a gas is 730 mmHg when its volume is 200.0 mL. Calculate the pressure (in atm) if the gas is allowed to expand to 0.6 L at a constant temperature. R L Top Alkaline Earth Metals Bottom

  22. A sample of gas at 3.00 x 102mm Hg inside a steel tank is cooled from 400.0 °C to 273 K. What is the final pressure of the gas in the steel tank, in atm?

  23. A sample gas occupies a volume of 8.80 L at 23.0OC. What will the temperature be, in degrees Celsius, if the volume of the gas is reduced to 1.40 L.

  24. What is the pressure and temperature at STP?

  25. What temperature, in OC and K, is absolute zero? Insert Text for Question

  26. If I have 43 liters of helium in a balloon at 250 C and increase the temperature of the balloon to 580 C, what will the new volume, in milliliters, of the balloon be? The nucleus has a _____ mass, a ____ volume, and is therefore _____.

  27. A student finds an unknown quantity of F2 gas at a pressure of 785 mmHg, a volume of 32 L and a temperature of 87 0C. How many moles of fluorine gas do did this student have?

  28. If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature?

  29. If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87 0C, how many moles of gas do I have?

  30. 7.7 grams of C2H2 gas are at a pressure of 0.09 atm and at a temperature of 56 0C, what is the volume of the container that the gas is in?

  31. An unknown quantity of CO, carbon monoxide gas, at a pressure of 770 mmHg occupies a volume of 32.0 L, and a temperature of 87 0C, how many grams of gas do I have?

  32. 102.0 grams of Chlorine gas, Cl2, in a container with a volume of 6000 milliliters and at a temperature of 127 OC, what is the pressure inside the container?

  33. Final Jeopardy What volume of H2O, collected at 25.0°C and 0.8 atm would be produced by the decomposition of 64.0 g O2? Hint: think stoichiometry and 2H2 + O2(s)2H2O

  34. Closing • Unit #4 Exam TOMORROW! • Take home your binders tonight • Answers to study guide posted TONIGHT! • Sleep! Study! Contact me! • Make your 3x5 study card

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