Answer Happy

9:59 Page 2 of 12 3 of 12 CHM 109 Exam 4 General Chemistry Fall 2021 Name: Part 1: Multiple Choice Please select the best answer for each of the following questions and indicate it in the appropriate spot on the cover sheet. (3 points each question) 1. left my water bottle in my car overnight with a little bit of liquid water sitting at the bottom. The temperature got pretty cold at night, but didn't go below freezing. If the temperature when I went back out to my car in the morning was 41 'F. (50 °C), and the barometric pressure was 751 mmHg, what was the vapor pressure inside the water bottle? a. 751 mmHg b. 760. mmHg C. 6.5 mmHg d. 744 mmHg e. 55.3 mmHg 2. The graph below shows the distribution of velocities for in five containers of different noble gases at 300 K: He. Ne, Ar, Kr, and Xe. Which temperature is represented by the curve indicated by the arrow? 0.0012 0.0010 - a. He b. Ne Ar d. Kr Xe 0.000 0.000 1000 (9) Page 3 of 12 CHM 109 Exam 4 General Chemistry Fall, 2021 Name: : 3. Which of the following molecules is probably soluble/miscible in ammonia (NH.)? a. Bromine: Br2 b. Tetrachloromethane: CCL C. Nitrogen trichloride: NCI d. Methanol: CH,OH (carbon is central atom, last His bonded to O) d. ( e. Phosphine: PH 4. Which of the following participate in hydrogen bonding? [ NH" I. CHA I. NHS a. I only b. i only c. only d. i and in a. li and in 1. ll, and it 6 filled in a balloon to 2 601 in Columbue what the slem 1. bar and RA 1 A attachments.office.net
9:59 Page 3 of 12 4 of 12 CHM 109 Exam 4 General Chemistry Fall, 2021 Name: 3. Which of the following molecules is probably soluble/miscible in ammonia (NH)? a. Bromine: Bry b. Tetrachloromethane: CCL 6. Nitrogen trichloride: NCI d. Methanol: CH,OH (carbon is central atom, last His bonded to O) e. Phosphine: PH, 4. Which of the following participate in hydrogen bonding? LNH I. CH4 INH a. I only b. only c. ill only d. i and i e. ll and in 1. lll, and it 5. If I filled up a balloon to 2.50 L in Columbus where the air pressure was 1.08 bar, and then brought it up in an airplane where the air pressure was only 0.885 bar, how big would the balloon be up there? a. 3.05 L b. 2.05 C. 0.3821 d. 2.62 L e. 2.40 L 6. A 1.5L container contains 60.0% 02. 28.0% CO2 and 12.0% CO at 1150 torr of pressure, what is the partial pressure of CO in that container? (Don't worry about , ( significant figures here.) a. 690 torr b. 322 torr C. 138 torr d. 760 torr e. 0.18 ton Page 4 of 12 CHM 109 Exam 4 General Chemistry Fall, 2021 Name: Part 2: Free Response Please answer the following questions clearly and concisely using English words, math, equations, pictures, symbols or diagrams as necessary. The objective is to convey your thoughts as clearly. yet briefly as possible. (To save time, I recommend not using too many complete sentences.) 7. Remember that friend of mine from grad school who accidentally causes a furnace explosion from methanol in an autoclave? Let's explore that! a. (5 points) If he puts 0.300 moles of chloroform in a 0.100 L steel container, sealed it tightly, and then healed it up to 250.0 °C, what would he expect the pressure in atm to be according to the ideal gas law? A attachments.office.net
9:59 5 of 12 Page 4 of 12 Fall, 2021 CHM 109 Exam 4 General Chemistry Name: Part 2: Free Response Please answer the following questions clearly and concisely using English words, math, equations, pictures, symbols or diagrams as necessary. The objective is to convey your thoughts as clearly, yet briefly as possible. (To save time, I recommend not using too many complete sentences.) 7. Remember that friend of mine from grad school who accidentally causes a furnace explosion from methanol in an autoclave? Let's explore that! ! a. (5 points) If he puts 0.300 moles of chloroform in a 0.100 L steel container, sealed it tightly, and then heated it up to 250.0 °C, what would he expect the pressure atm to be according to the ideal gas law? b. (8 points) What would he expect the pressure in atm to be inside the tank of part (a) according to the van der Waals equation? (The one with corrections to the ideal gas law.) In this case, was it worth it to use the full van der Waals equation? (Was the pressure higher in part b than in part a?) Page 5 of 12 Fall, 2021 CHM 109 Exam 4 General Chemistry! Name: 8. Let's compare two similar molecules: fluoromethane, and tetrafluoromethane. Lewis , structures of both molecules are shown below. H CF - CH H Fluoromethane Tetrafluoromethane a (3 points) Which would you expect to have a lower boiling point? ) ? Fluoromethane or Tetrafluoromethane h 13 noints which will have stronger dispersion forces? INOT total IMES!) 3 ? ) attachments.office.net
9:59 Page 5 of 12 6 of 12 Fall, 2021 CHM 109 Exam 4 General Chemistry Name: 8. Let's compare two similar molecules: fluoromethane, and tetrafluoromethane. Lewis structures of both molecules are shown below. H F C110111H -C11F F H Fluoromethane F Tetrafluoromethane a. (3 points) Which would you expect to have a lower boiling point? Fluoromethane or Tetrafluoromethane b. (3 points) Which will have stronger dispersion forces? (NOT total IMFs!) Fluoromethane or Tetrafluoromethane C. (3 points) Which would you expect to have a higher vapor pressure at room temperature? Fluoromethane or Tetrafluoromethane d. (3 points) Which would you expect to have higher surface tension? Fluoromethane or Tetrafluoromethane e. (3 points) Which would you expect to mix more easily with ethanol? (The Lewis structure of ethanol is given below.) HH H HI 30- H Fluoromethane or Tetrafluoromethane Page 6 of 12 Fall, 2021 CHM 109 Exam 4 General Chemistry! Name: 9. Now let's compare two similar gases: CO, and CO a. (3 points) Which one has stronger intermolecular forces attracting the molecules together? CO2 or CO b. (3 points) Why? (In 20 words or fewer.) attachments.office.net