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Final Jeopardy Question

Gas Law Concepts. Gas Law Calc- ulations. Gas Law Demos. SCUBA & Green- House Effect. STP & Temp. Conver- sions. 100. 100. 100. 100. 100. 200. 200. 200. 200. 200. 300. 300. 300. 300. 300. 400. 400. 400. 400. 400. 500. 500. 500. 500. 500.

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Final Jeopardy Question

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  1. Gas Law Concepts Gas Law Calc- ulations Gas Law Demos SCUBA & Green- House Effect STP & Temp. Conver- sions 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 Final Jeopardy Question

  2. Category 1 500 pts Experiment: Student A begins boiling a cup of water in Boston while Student B does the same at the same time in Denver. Which student’s water will boil first and WHY? Back

  3. Category 1 500 pts Answer Student B (in Denver) since the atmospheric pressure is lower in Denver (higher altitude), water here will boil first. The water in Denver will not need to meet as high of an atmospheric pressure as that in Boston. Back

  4. Category 1 400 pts As you go down in elevation, what happens to the atmospheric pressure and WHY? Back

  5. Category 1 400 pts Answer Pressure increases as elevation decreases because the air is more dense at lower elevations. Back

  6. Category 1 300 pts What does John’s Law state and what is the equation? Back

  7. Category 1 300 pts Answer As pressure goes up, temperature goes up (and vice-versa) at constant volume. P1 = P2 T1 T2 Back

  8. Category 1 200 pts What is the equation for Boyle’s law? Back

  9. Category 1 200 pts Answer P1V1 = P2V2 Back

  10. Category 1 100 pts What does Charles’ Law state? Back

  11. Catergory 1 100 pts Answer At constant pressure, as temperature increases, volume increases (and vice-versa). Back

  12. Category 2 500 pts A sample of gas has a volume of 23 mL at 39oC and 890 mm Hg. This sample is cooled down to 11oC and now has a volume of 150 mL. What is the new pressure? Back

  13. Category 2 500 pts Answer Use the combined gas law since all variables are changing… P1V1 = P2V2 T1 T2 890 mm Hg ( 23 mL) = P2 (150 mL) 312 K 284 K P2 = 124.22 mm Hg Back

  14. Category 2 400 pts A 50 L container is filled with a gas to a pressure of 4.7 atm at 32oC. At what temperature IN DEGREES CELSIUS will the pressure inside the container be 3.5 atm with a volume of 50 L? Back

  15. Category 2 400 pts Answer Volume is constant, so use John’s law. P1= P24.7 atm = 3.5 atm T1 T2 305 K T2 T2 = 227.13 K = -45.87 oC Back

  16. Category 2 300 pts A gas occupies a volume of 34 mL at 21.8 oC. To what temperature (in Kelvin) must the gas be raised to have a volume of 86 mL? Assume constant pressure. Back

  17. Category 2 300 pts Answer Pressure is constant, so use Charles’ law. V1= V234 mL = 86 mL T1 T2 294.8 K T2 T2 = 745.67 K Back

  18. Category 2 200 pts A balloon has a volume of 6L at 13.2 psi. If the balloon was brought to a pressure of 9.3 psi, what would the new volume be (assume constant temp). Back

  19. Category 2 200 pts Answer Temp is constant, so use Boyle’s law. P1V1 = P2V2 13.2 psi (6L) = 9.3 psi (V2) V2 = 8.52 L Back

  20. Category 2 100 pts Whose law is being used in the following situation… A sample of gas in a flexible container occupies 46.5 mL at standard pressure. What volume will it take up if the pressure was increased to 3 atm? Assume constant temp. Back

  21. Catergory 2 100 pts Answer Temp is held constant, so it is Boyle’s law. Back

  22. Category 3 500 pts Convert 280.1 kPa to mm Hg. Back

  23. Category 3 500 pts Answer 760 mm Hg x 280.1 kPa 101.3 kPa = 2101.44 mm Hg Back

  24. Category 3 400 pts What is the Kelvin value for absolute zero, and what theoretically happens at this temperature? Back

  25. Category 3 400 pts Answer ZERO Kelvin (0K), and everything stops moving at this temp. Back

  26. Category 3 300 pts What is 550K in oC? Back

  27. Category 3 300 pts Answer 277 oC K = 273 + oC SO… oC = K-273 Back

  28. Category 3 200 pts What is 38.5 oC in Kelvin? Back

  29. Category 3 200 pts Answer 311.5 K K = 273 + oC Back

  30. Category 3 100 pts What are the values for STP in kPa and torr? Back

  31. Catergory 3 100 pts Answer 101 kPa and 760 torr Back

  32. Category 4 500 pts Explain how a straw works – and DO NOT USE THE WORD “SUCK”. Back

  33. Category 4 500 pts Answer When you inhale, your body takes in the air that is in a straw, creating less pressure in the straw. Since the pressure in the straw is less than the pressure outside the straw, the atmospheric pressure PUSHES the liquid into the straw so you can enjoy! Thank heaven for atmospheric pressure! Back

  34. Category 4 400 pts Explain the egg in flask demo. AND DO NOT USE THE PHRASE “SUCKED IN”. Back

  35. Category 4 400 pts Answer In the egg demo, water was heated in the flask. Since temp increased in the flask, the pressure also increased. The flask was then taken away from the heat, and an egg was placed on top. The flask cools, so the pressure inside the flask decreased. Since the pressure inside the flask decreased, the atmospheric pressure outside the flask PUSHED the egg into the flask. Back

  36. Category 4 300 pts A pressure apparatus that contains a sample of gas at a fixed volume is first placed into a container of hot water. It is then plunged into a container of liquid nitrogen. What happens to the pressure and why? Back

  37. Category 4 300 pts Answer This is an example of John’s law – when temp goes down, pressure goes down. Back

  38. Category 4 200 pts Explain why the Ivory soap expanded in the microwave. Back

  39. Category 4 200 pts Answer Since temp increased, so does volume. This is Charles’ law. Back

  40. Category 4 100 pts What will happen to the volume of a balloon if it is placed into a bell jar (vacuum pump) and the pump is turned on. Hint: in a bell jar, the pressure inside decreases. Back

  41. Catergory 4 100 pts Answer The volume of the balloon will increase. This is Boyle’s law… as P decreases, V increases and vice versa. Back

  42. Category 5 500 pts What is the relationship between pressure and depth as you descend during a SCUBA dive? Back

  43. Category 5 500 pts Answer Every 10 meters (or 32 feet) you descend is an increase in 1 atm. Back

  44. Category 5 400 pts What would happen if someone ascended too quickly during a SCUBA dive? Back

  45. Category 5 400 pts Answer The lungs of the diver can expand too quickly and tear. Since pressure decreases as you ascend, volume will increase (Boyle’s law). Back

  46. Category 5 300 pts What has caused an increase in global warming (greenhouse effect) over the past 100 years? Back

  47. Category 5 300 pts Answer Gases in the earth’s atmosphere absorb heat coming from the earth’s surface and reflect it back to the earth. This warms the earth. Through our daily activities such as driving cars, using a BBQ grill, using air conditioners and refrigerators, more gases are emitted into the environment which increases global warming. Back

  48. Category 5 200 pts What is the relationship between the solubility of a gas and depth of descent? Back

  49. Category 5 200 pts Answer As you descend further (elevation decreases), the solubility of a gas increases. So, at deeper depths, you will have more gas dissolved in your body. Back

  50. Category 5 100 pts What is one characteristic of the ozone layer? Back

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