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iheartfood

  • 2 years ago

#1: The average velocities of gas molecules in cylinders A, B, C, and D are 20 m/s, 50 m/s, 60 m/s, and 100 m/s, respectively. The volume of each cylinder is the same, and each has the same number of moles of gas. Which cylinder is the hottest? A,B,C or D? **my answer: D is that right? @aaronq :)

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  1. aaronq
    • 2 years ago
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    yep, average kinetic energy = temperature

  2. iheartfood
    • 2 years ago
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    #2: You have 0.5 L of air at a pressure of 203 kPa and 70°C in a rigid, sealed container. What is the absolute temperature of the air? A. - 70 K B. 70 K C. 203 K D. 273 K **my answer: C is that right?

  3. iheartfood
    • 2 years ago
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    awesome! so #1 is right? it's D?

  4. iheartfood
    • 2 years ago
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    #3: At which of the following temperatures is the average kinetic energy of the molecules in one liter of nitrogen gas greatest? A. 40°C B. 273 K C. 310 K D. 60°C **my answer: B. 273 K is that right?? I'm not too entirely sure tho :/

  5. aaronq
    • 2 years ago
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    what do they mean by absolute temperature? because it doesn't seem like the mean the kelvin scale

  6. iheartfood
    • 2 years ago
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    i honestly don't know!! Hahha it just says absolute temperature....i think it means kelvin tho.. idk :/

  7. iheartfood
    • 2 years ago
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    #4: At 52°C, the pressure inside a gas-filled container is 467 kPa. What is the absolute temperature of the gas? A. 163 K B. 325 K C. 335 K D. 651 K **my answer: B. 325 K

  8. aaronq
    • 2 years ago
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    #3 is asking which temp is the highest

  9. iheartfood
    • 2 years ago
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    i think they mean kelvin cuz in chem they refer to it as abs. temp a lot.. and kelvin appears A LOTT in my lessons :/

  10. iheartfood
    • 2 years ago
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    oh so would #3 be D. 60°C??

  11. aaronq
    • 2 years ago
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    no well i know that kelvin is the absolute temp scale :P

  12. iheartfood
    • 2 years ago
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    #5: choose the statement that is true at room temperature if both systems are at the same pressure and volume according to the pic attached!

  13. iheartfood
    • 2 years ago
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    A. The temperature of the system in curve A is greater than the temperature of the system in curve B. B. The temperature of the system in curve B is greater than the temperature of the system in curve A. C. The temperature of the system in curve A is equal to the temperature of the system in curve B. ***my answer: A is that right?

  14. aaronq
    • 2 years ago
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    i think they want it scaled in regards to pressure...

  15. aaronq
    • 2 years ago
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    yep 3 is C

  16. aaronq
    • 2 years ago
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    4 is right, but 2 still doesn't make sense, none of the options are correct..

  17. iheartfood
    • 2 years ago
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    wait so #3 is C. 310 K ??? and yay for 4! and aww :( idk then.. what do u think about #2 then? and was 1 correct?

  18. aaronq
    • 2 years ago
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    5 is incorrect.. you're getting mixed up with the graph by it just being taller. Look at the axes. you know that speed is proportional to temperature, i.e. the faster the molecules the greater the temp

  19. iheartfood
    • 2 years ago
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    so the answer for 5 is B ten?

  20. iheartfood
    • 2 years ago
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    *then lol

  21. aaronq
    • 2 years ago
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    sorry i meant 3 is D, 333 Klvin

  22. aaronq
    • 2 years ago
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    1 was good

  23. iheartfood
    • 2 years ago
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    okay! :)

  24. aaronq
    • 2 years ago
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    for 2, i honestly don't know, none of the choices given make any sense

  25. iheartfood
    • 2 years ago
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    ohh :( okay... what would u go with as ur guess tho?? for #2? and what was 5 then? was it B?

  26. aaronq
    • 2 years ago
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    um for 2, i honestly can't say one is more right then the other haha sorry :( for 5, maybe, why do you think so?

  27. iheartfood
    • 2 years ago
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    okay haha ill have to wing #2 :P and 5 i think cuz A drops REALLYYY fast right? but B is constant and the curve elongates more... am i right?? is the answer B?

  28. aaronq
    • 2 years ago
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    um it's B, not those aren't reasons :P basically, because B is farther right on the "speed" axis, that tells you that it has higher kinetic energy and therefore higher temperature, ta-da

  29. iheartfood
    • 2 years ago
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    hahah i seee :) lol and i liked the ta-da thing at the end :P

  30. aaronq
    • 2 years ago
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    the elongation part if just the distribution of speed of the molecules, more narrow bands have smaller distributions (particles are only within a small temperature range e.g. 20-30 degrees) longer distributions (like B) say that the range of temp of the particles is large, e.g. 10-60 degrees

  31. aaronq
    • 2 years ago
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    hahaha woo :) sometimes it's like magic, chemistry

  32. iheartfood
    • 2 years ago
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    ohh okay haha thanks sooooo muchh!!!! :) u da besttt :) u rock and you rule!! :) haha and i know its like magic!

  33. aaronq
    • 2 years ago
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    LOL that picture is awesome!... but corny thanks! see ya

  34. iheartfood
    • 2 years ago
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    haha definitely! see ya!! Thanks again :)

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