CHM 113 Practice Exam 4 Fall 2023

pdf

School

Arizona State University, Tempe *

*We aren’t endorsed by this school

Course

113

Subject

Chemistry

Date

Dec 6, 2023

Type

pdf

Pages

Uploaded by hermit_crabs

CHM 113—Prof. Darcy Kimball Practice Exam 4 1 Circle your Recitation Section below: R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 Circle your Recitation Table Number below: 1 2 3 4 5 6 7 8 9 10 11 12 13 Unit 4 Practice Exam CHM 113 Your Name 1. You are responsible for the information on this page. Please read it carefully. 2. Three pieces of information must be printed and coded on the scantron sheet: Print and code your name . Print and code your 10-digit affiliate ID . The affiliate ID is the second sequence of numbers on your University ID card (100-------- or 120 ------ ). Be sure to BUBBLE IN your Exam Version . 3. Use only a #2 pencil. You CANNOT use pen (the scantron machine cannot read it)! 4. Do all calculations on the exam pages. Do not make any unnecessary marks on the answer sheet and make sure any erasing is thorough. 5. The exam consists of 25 questions worth 4 points each. Make sure you have all pages. 6. Choose the one best answer to each of the questions and mark your selection on the Scantron sheet. Read all responses before making a selection. Do not mark more than one selection. 7. When you are finished, bring your ASU Student ID and turn in both your Scantron and exam booklet to a proctor. **IMPORTANT** • IF YOU ARE SITTING WHERE YOU WILL BE TEMPTED TO LOOK AT SOMEONE ELSE’S WORK (OR VICE VERSA) PLEASE MOVE NOW. • KEEP YOUR TEST BOOKLET AND SCANTRON FORM COVERED DURING THE EXAM SO THAT NONE OF YOUR NEIGHBORS CAN SEE THEM. • BE SURE TO SHOW ALL YOUR WORK IN YOUR EXAM BOOKLET. ONLY THE SCANTRON IS GRADED. BUT IF ACADEMIC DISHONESTY BY YOU OR ONE OF YOUR NEIGHBORS IS SUSPECTED, WHAT YOU WRITE IN YOUR TEST BOOKLET IS YOUR BEST PROOF THAT THE WORK IS YOUR OWN. THE MINIMUM SANCTION FOR CHEATING ON AN EXAM IS A ZERO ON THAT EXAM. THE MAXIMUM PENALTY IS EXPULSION FROM THE COURSE AND UNIVERSITY. PLEASE DO NOT MAKE ME EXERCISE THIS RULE AS I HAVE DONE SO IN THE PAST. • You will be keeping your exam booklet for Exam 4, only turning in your scantron.

CHM 113—Prof. Darcy Kimball Practice Exam 4 2 1. Nonpolar, molecular compounds of low molecular weight tend to be gases at room temperature. (Ch. 10) Which of the following is least likely to be a gas at room temperature? A. HCl B. LiCl C. H 2 D. CH 4 2. (Ch. 10) Which of the following would decrease the pressure of a sample of N 2 gas? A. Adding more N 2 B. Increasing the temperature C. Decreasing the kinetic energy D. Decreasing the volume E. Adding neon gas 3. A small bubble with a volume of 3.20 mL bubble rises from the bottom of a lake, where the pressure is 5.41 atm and the temperature is 12.4°C, to the surface where the pressure is 743 torr and the temperature is 28.5°C. (Ch. 10) What is the final volume of the bubble (in mL) ? A. 24.6 B. 18.7 C. 17.2 D. 41.8 4. (Ch. 10) How many moles of gas are present in a 50.0 L container at 22.0°C and 825 torr? A. 0.603 B. 2.23 C. 1.70 x 10 3 D. 2.29 x 10 4

CHM 113—Prof. Darcy Kimball Practice Exam 4 3 5. Ammonium nitrite undergoes thermal decomposition to produce only gases according to the reaction below. 𝑵𝑵𝑵𝑵 𝟒𝟒 𝑵𝑵𝑵𝑵 𝟐𝟐 ( 𝒔𝒔 ) → 𝑵𝑵 𝟐𝟐 ( 𝒈𝒈 ) + 𝟐𝟐 𝑵𝑵 𝟐𝟐 𝑵𝑵 ( 𝒈𝒈 ) (Ch. 10) What volume (in L) of gas is produced by the decomposition of 35.0 g of ammonium nitrite at 525°C and 1.5 atm? A. 16 B. 24 C. 72 D. 131 6. The density of air at STP is 1.285 g/L. (Ch. 10) Which of the following gases will fill a balloon that does NOT float in air at STP? A. NO ( g ) B. CH 4 ( g ) C. NH 3 ( g ) D. Ne ( g ) 7. A pressure vessel contains a mixture of carbon dioxide, CO 2 (P CO2 = 3.78 atm) and oxygen, O 2 (P O2 = 6.00 atm) gases. (Ch. 10) The mole fraction of CO 2 is , making the mole-fraction of O 2 . A. 0.39; 0.61 B. 0.61; 0.39 C. 0.63; 1.59 D. 1.59; 2.59 8. Carbon dioxide (CO 2 ) and an unknown gas start to effuse from a container and the CO 2 takes 4.69 times as long to escape as the unknown gas. (Ch. 10) True or False. A likely identity for the unknown gas is NO 2 (g) . A. True B. False

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

CHM 113—Prof. Darcy Kimball Practice Exam 4 4 9. (Ch. 10) Which noble gas is expected to show the largest deviation from the ideal gas behavior? A. helium B. neon C. argon D. krypton E. xenon 10. (Ch. 11) In liquids, the attractive intermolecular forces are . A. very weak compared with kinetic energies of the molecules. B. strong enough to keep the molecules confined to vibrating about their fixed lattice points. C. weaker than the repulsion forces. D. strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other. 11. Elemental iodine (I 2 ) is a solid at room temperature. (Ch. 11) What is the dominant intermolecular force that exists among different I 2 molecules in the solid? A. dispersion forces B. dipole-dipole forces C. hydrogen bonds D. ion-dipole forces 12. When NaCl dissolves in water, aqueous Na + and Cl ─ ions result. (Ch. 11/13) The dominant force of attraction that exists between Na + and H 2 O is called a(n) . A. dispersion force. B. dipole-dipole interaction. C. hydrogen bond. D. ion-dipole interaction.

CHM 113—Prof. Darcy Kimball Practice Exam 4 5 13. Propane (CH 3 CH 2 CH 3 ) and acetaldehyde (CH 3 CHO) both have the same molar mass (44 g/mol) but have different dipole moments (0.1 D for propane and 2.7 D for acetaldehyde). (Ch. 11) Compare these two molecules in the table below for each property listed. Property Propane or Acetaldehyde? highest boiling point lowest surface tension highest vapor pressure highest critical temperature 14. (Ch. 11) Which statements about viscosity are true ? (i) Viscosity increases as temperature decreases. (ii) Viscosity increases as molecular weight increases. (iii) Viscosity increases as intermolecular forces increase. A. (i) only B. (ii) and (iii) C. (i) and (iii) D. (i) and (ii) E. (i), (ii) and (iii)

CHM 113—Prof. Darcy Kimball Practice Exam 4 6 15. Consider the phase diagram below for an unknown substance. (Ch. 11) What is the normal boiling point (in °C) for this substance? A. 20°C B. 40°C C. 60°C D. 100°C 16. Consider the phase diagram below for an unknown substance. (Ch. 11) Which of the following pressure/temperature combinations is incorrectly matched with the phase of the unknown substance? A. ─10°C and 1.0 atm (substance is in the solid phase) B. 20°C and 0.75 atm (substance is in the liquid phase) C. 30°C and 0.5 atm (substance is in the gas phase) D. 60°C and 1.6 atm (substance is in the gas phase)

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

CHM 113—Prof. Darcy Kimball Practice Exam 4 7 17. (Ch. 11/13) What type(s) of intermolecular force(s) exist between ammonia (NH 3 ) and water (H 2 O)? A. dispersion forces only B. dispersion forces, dipole-dipole interactions C. dispersion forces, dipole-dipole interactions, hydrogen bonds D. hydrogen bonds only 18. (Ch. 13) When argon (in left bulb) is allowed to mix with neon (in right bulb) after the stopcock is opened, the argon spontaneously disperses throughout the neon because . A. of the large attractive forces between argon and neon atoms. B. heat is released during mixing. C. mixing results in an increase in the overall energy of the system. D. the dispersion of argon atoms produces an increase in disorder. 19. (Ch. 13) Which one of the following substances is most likely to dissolve in benzene (C 6 H 6 )? A. CH 3 CH 2 OH B. CF 4 C. HBr D. NaCl

CHM 113—Prof. Darcy Kimball Practice Exam 4 8 20. A 30.0 g sample of potassium nitrate is dissolved in 100 g of water at 60°C. The solution is cooled to 20.0°C and no precipitate is observed. (Ch. 13) True or False. This solution is supersaturated . Hint: Use the solubility curve of KNO 3 provided above to answer this question. A. True B. False 21. (Ch. 13) Pressure has an appreciable effect on the solubility of in liquids. A. gases B. liquids C. solids D. solids and liquids 22. (Ch. 13) Colligative properties of solutions include all of the following except the upon the addition of a solute to the solvent. A. depression of vapor pressure B. elevation of the boiling point C. elevation of the freezing point D. increase in the osmotic pressure

CHM 113—Prof. Darcy Kimball Practice Exam 4 9 To receive completion credit for the Unit 4 Practice Exam, you must complete Practice Exam 4 in Canvas. This document is a hard-copy of that practice exam. I will go over all of the answers for this practice exam in my Exam 4 Review Session (will be conducted in Zoom and will be recorded). 23. (Ch. 13) Which aqueous solution should have the highest boiling point ? A. 0.1 m NaCl B. 1 m KCl C. 0.01 m CaCl 2 D. 10 m CCl 4 24. (Ch. 13) What is the vapor pressure (in mmHg) of water at 25°C above a solution prepared by dissolving 25 g of urea (CO(NH 2 ) 2 ) in 75 g of water? Hint: The vapor pressure of pure water at 25°C is 23.8 mmHg. A. 2.2 B. 6.0 C. 18 D. 22 25. (Ch. 13) What is the new boiling point (°C) of an aqueous solution that is 27.1% sodium nitrate by mass? Hint: The molal boiling point elevation constant for water is 0.52°C/ m. A. 128.28 B. 104.54 C. 100.28 D. 2.27

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version