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iheartfood

  • one year 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
    • one year ago
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    yep, average kinetic energy = temperature

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

  4. iheartfood
    • one year 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
    • one year 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
    • one year 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
    • one year 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
    • one year ago
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    #3 is asking which temp is the highest

  9. iheartfood
    • one year 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
    • one year ago
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    oh so would #3 be D. 60°C??

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

  12. iheartfood
    • one year 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
    • one year 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
    • one year ago
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    i think they want it scaled in regards to pressure...

  15. aaronq
    • one year ago
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    yep 3 is C

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

  17. iheartfood
    • one year 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
    • one year 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
    • one year ago
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    so the answer for 5 is B ten?

  20. iheartfood
    • one year ago
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    *then lol

  21. aaronq
    • one year ago
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    sorry i meant 3 is D, 333 Klvin

  22. aaronq
    • one year ago
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    1 was good

  23. iheartfood
    • one year ago
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    okay! :)

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

  25. iheartfood
    • one year 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
    • one year 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
    • one year 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
    • one year 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
    • one year ago
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    hahah i seee :) lol and i liked the ta-da thing at the end :P

  30. aaronq
    • one year 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
    • one year ago
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    hahaha woo :) sometimes it's like magic, chemistry

  32. iheartfood
    • one year 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
    • one year ago
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    LOL that picture is awesome!... but corny thanks! see ya

  34. iheartfood
    • one year ago
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    haha definitely! see ya!! Thanks again :)

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