exam1 - Version 267 Exam 1 mccord(50960 This print-out...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Version 267 – Exam 1 – mccord – (50960) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Absolute zero (0 K) is the temperature at which 1. None of these 2. a graph of P versus 1 V intersects the 1 V axis. 3. gaseous helium liquefies. 4. the straight line graph of V versus T intersects the T axis. correct 5. a graph of V versus 1 P intersects the 1 P axis. Explanation: A graph of V vs. T is a straight line. This line intersects the temperature axis at - 273 C, at which is 0 K or absolute zero. 002 10.0points For a sample of gas held at constant temper- ature, a plot of volume versus pressure is a straight line. 1. False correct 2. True Explanation: Volume of a gas sample is inversely propor- tional to pressure. The plot of V versus P is not a straight line, but a hyperbola. 003 10.0points Which of the following is most likely to devi- ate from ideal behavior? 1. a gas at high pressure correct 2. a noble gas 3. a gas at high temperature 4. a gas at low density Explanation: Deviations from ideality occur due to molecular attractions or repulsions. More attractions or repulsions can occur when the molecules are closer together. Low pressure, high volume, and low density all correspond to molecules being far apart. Low temper- ature often corresponds to molecules being close together. It also corresponds to low ki- netic energy which allows molecules to ‘stick together’ easier. High pressures also corre- spond to molecules being close together. 004 10.0points The following plot is for an ideal gas. Identify what state function(s) could be represented by x for this plot. x V 1. T , or n correct 2. T only 3. P , or n 4. P , or T 5. n only 6. P only 7. P , T , or n Explanation: The plot shows a direct proportionality (a straight line). According to the Ideal Gas Law, volume ( V ) is directly proportional to temperature ( T ) and the number of moles ( n ) of a gas. Volume is inversely proportional to pressure. 005 10.0points
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Version 267 – Exam 1 – mccord – (50960) 2 The graph shows the Maxwell distribution plots for a given gas at three different temper- atures. 0 500 1000 1500 2000 velocity (m/s) relative number of molecules A B C Which plot corresponds to the highest tem- perature? 1. B 2. C correct 3. Can not be determined from this type of plot. 4. A Explanation: The higher the temperature, the broader the range of velocity distributions and the higher the average velocity. So curve C matches that criteria. 006 10.0points A sample of argon gas occupies a volume of 364 mL at 15 C. What volume will the gas occupy at 61 . 2605 C, assuming constant pressure? 1. 422.468 2. 335.654 3. 457.743 4. 358.665 5. 403.147 6. 303.919 7. 376.77 8. 412.043 9. 282.764 10. 220.333 Correct answer: 422 . 468 mL. Explanation: V 1 = 364 mL V 2 = ? T 1 = 15 C = 288 K T 2 = 61 . 2605 C = 334 . 26 K By Charles’ law, V 1 T 1 = V 2 T 2 V 2 = V 1 T 2 T 1 = (364 mL)(334 . 26 K) 288 K = 422 . 468 mL 007 10.0points The Scoville scale is a measurement of the spicy heat of a chili pepper. The number of Scoville heat units (SHU) is really an indica- tor of how much capsaicin is present in the chili. So could the spicy heat of a pepper be considered a state function?
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern