CHEM133 FINAL EXAM QUESTIONS and ANSWERS -100% VERIFIED, Study Guides, Projects, Research of Nursing

Download CHEM133 FINAL EXAM QUESTIONS and ANSWERS -100% VERIFIED and more Study Guides, Projects, Research Nursing in PDF only on Docsity! CHEM133 FINAL EXAM QUESTIONS and ANSWERS -100% VERIFIED Part 1 of 11 - 0.0/ 0.0 Points No Questions Part 2 of 11 - 133 MC Chapter 07 10.0/ 10.0 Points Question 1 of 35 2.0/ 2.0 Points Calculate the standard enthalpy of formation (ΔHformation) for LiCl(s) given the following data using the Born-Haber cycle: ΔHsublimation Li = 155.2 kJ/mol IE1 Li = 520 kJ/mol Bond energyCl–Cl = 242.7 kJ/mol EACl = 349 kJ/mol Lattice energyLiCl(s) = 828 kJ/mol A. 320 kJ/mol B. 440 kJ/mol C. -260 kJ/mol D. -380 kJ/mol E. -1420 kJ/mol Feedback: See Chapter 07 Question 2 of 35 2.0/ 2.0 Points Choose the compound with the most ionic bond. A. KCl B. LiF C. NaCl D. KF E. LiCl Feedback: See Chapter 07 Question 3 of 35 2.0/ 2.0 Points Use the following bond energies to estimate the enthalpy change for the following reaction, one mole of CH4 with chlorine gas to give CH3Cl and hydrogen chloride. BEC–H = 414 kJ/mol BEC–Cl = 326 kJ/mol BEH–Cl = 432 kJ/mol BECl–Cl = 243 kJ/mol A. +101 kJ/mol B. -101 kJ/mol C. +106 kJ/mol D. +331 kJ/mol E. -106 kJ/mol Feedback: See Chapter 07 Question 4 of 35 2.0/ 2.0 Points Atoms having equal or nearly equal electronegativities are expected to form A. polar covalent bonds B. covalent bonds C. nonpolar covalent bonds D. ionic bonds E. no bonds Feedback: See Chapter 07 Question 5 of 35 2.0/ 2.0 Points What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for the fulminate ion, CNO–, based on minimizing formal charge overall? A. 0 B. -2 C. +2 D. -1 E. +1 Feedback: See Chapter 07 Part 3 of 11 - 133 MC Chapter 08 OpenStax 10.0/ 10.0 Points Question 6 of 35 2.0/ 2.0 Points A. cyclohexane B. acetone C. ether D. water E. cannot tell with the information given Feedback: See Chapter 10 Question 14 of 35 2.0/ 2.0 Points When a liquid is heated at its boiling point, the: A. temperature of the vapor phase increases. B. covalent bonds are broken, allowing vaporization to occur. C. temperature of the liquid remains the same as long as any liquid is present. D. temperature of the liquid increases. Feedback: See Chapter 10 Question 15 of 35 2.0/ 2.0 Points Rhodium has a face-centered cubic structure and has a density of 12.4 g/cm3. What is its atomic radius? A. 380. Pm B. 268 pm C. 134 pm D. 1070 pm Feedback: See Chapter 10 Part 5 of 11 - 133 MC Chapter 05 OpenStax 10.0/ 10.0 Points Question 16 of 35 2.0/ 2.0 Points A 100. mL sample of 0.200 M aqueous hydrochloric acid is added to 100. mL of 0.200 M aqueous ammonia in a calorimeter whose heat capacity (excluding any water) is 480. J/K. The following reaction occurs when the two solutions are mixed. HCl(aq) + NH3(aq) → NH4Cl(aq) The temperature increase is 2.34°C. Calculate ΔH per mole of HCl and NH3 reacted. A. 154 kJ/mol B. -1.96 kJ/mol C. -154 kJ/mol D. 485 kJ/mol E. 1.96 kJ/mol Feedback: See Chapter 05 Question 17 of 35 2.0/ 2.0 Points Calculate the work for the expansion of CO2 from 1.0 L to 5.8 L against a pressure of 1.0 atm at constant temperature. A. 4.8 L·atm B. 5.8 L·atm C. 0.0 L·atm D. -5.8 L·atm E. -4.8 L·atm Feedback: See Chapter 05 Question 18 of 35 2.0/ 2.0 Points How much heat is transferred per mole of NH3(g) formed in the reaction shown below? N2(g) + 3 H2(g) → 2 NH3(g) ΔH° = – 92.2 kJ A. 46.1 kJ B. 30.7 kJ C. 15.4 kJ D. 92.2 kJ Feedback: See Chapter 05 Question 19 of 35 2.0/ 2.0 Points How much heat is required to raise the temperature of 1.5 x 103 g of water from 45°F to 130.°F? The specific heat of water is 4.184 J/g·°C. A. 3.0 x 101 kJ B. 8.2 x 102 kJ C. 3.0 x 102 kJ D. 5.3 x 102 kJ E. 3.4 x 102 kJ Feedback: See Chapter 05 Question 20 of 35 2.0/ 2.0 Points What is expected when the reaction shown below takes place in a thermally-insulated container outfitted with a movable piston at a constant atmospheric pressure of 1 atm? 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g) A. Volume will increase and work will be done by the system. B. Volume will decrease and work will be done by the system. C. Volume will decrease and work will be done on the system. D. Volume will decrease and work will be done on the system. Feedback: See Chapter 05 Part 6 of 11 - 133 MC Chapter 09 OpenStax 10.0/ 10.0 Points Question 21 of 35 2.0/ 2.0 Points Gas A and gas B are combined in a flask at initial pressures of 1.0 atm each. The flask is sealed and over time they react to completion to give gas C according to the following chemical equation: 2A(g) + B(g) → C(g) Assuming the temperature stays constant, what will be the total pressure in the flask after the reaction goes to completion? A. 0.67 atm B. 0.50 atm C. 0.33 atm D. 1.0 atm E. 0.75 atm Feedback: See Chapter 09 Question 22 of 35 2.0/ 2.0 Points At constant temperature and volume, a sample of oxygen gas is added to a sample of nitrogen gas. The pressure of the mixture is found by adding the pressures of the two individual gases. This is an example of: A. Dalton's Law B. Gay-Lussac's Law C. Avogadro's Law Feedback: See Chapter 06 Comment: Correct Part 8 of 11 - 133 MC Chapter 08 OpenStax 10.0/ 10.0 Points Question 28 of 35 5.0/ 5.0 Points Write the ground state electron configurations for the following atom. Zinc (Zn) Determine the total number of unpaired electrons. Determine the magnetic properties (paramagnetic or diamagnetic). 1s22s22p63s23p63d104s2 is the electron configuration of Zinc (Zn). There are no unpaired electrons because each respective sublevel is filled. Due to having no unpaired electrons, zinc will be diamagnetic. Feedback: See Chapter 08 Comment: Good Question 29 of 35 5.0/ 5.0 Points Draw all the resonance structures of the nitrate ion, NO3 - ie) i eS) saad asst h Feedback: See Chapter 08 Comment: Very good Part 9 of 11 - 133 MC Chapter 10 OpenStax 10.0/ 10.0 Points Question 30 of 35 5.0/ 5.0 Points A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm. Calculate the number of atoms in the unit cell and diameter of the metal atom. Face-centered cubic has 4 atoms per unit cell. a = 408 pm r = 144 pm d = 288 pm Feedback: See Chapter 10 Comment: Very good Question 31 of 35 5.0/ 5.0 Points When silver crystallizes, it forms face-centered cubic cells. The unit cell edge is 408.7 pm. Given the density of silver is 10.5 g/cm3. Using this information, calculate Avogadro’s number. 4 atoms per cubic cell