CHM 113 Practice Exam 4 Fall 2023

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Arizona State University, Tempe *

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113

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Chemistry

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Dec 6, 2023

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pdf

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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

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.

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