Straighterline CHEM101 General Chemistry I Graded Exam 3 (New Version June 2024)

Question 1 Correct 5.00 points out of 5.00 If 2.38 mol of a gas has a volume of 120.0 mL, what is the volume of 1.97 mol of the gas at the same temperature and pressure? Select one: A. 99.3 mL B. 119 mL C. 145 mL D. 25.6 mL E. 563 mL Question 2 Correct 5.00 points out of 5.00 What are the conditions of STP? Select one: A. 0°C and 760 atm B. 273.15°C and 760 torr C. 0 K and 1 atm D. 0°C and 1 torr E. 273.15 K and 760 torr Straighterline CHEM101 General Chemistry I Graded Exam 3 (New Version June 2024) We are a team of experts offering class attendance for all Straighterline, Online ATI, HESI, NCLEX, Portage Learning, Sophia etc courses (including final proctored exams!!). We also write essays, discussion posts, research papers and school assignments. Should you need any of these services, Contact us via email: or : +1 (540) 753-5914. Guaranteed Passing! CHEM101_MH_V6 | Topic 14: Acid-Base Equilibria and Solubility Equilibria Started on State Finished Completed on Time taken 35 mins 28 secs GradeQuestion 4 Correct 5.00 points out of 5.00 Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100 cm3 at 95°C and 1000 mmHg (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg). Select one: A. 70.9 g/mol B. 35.3 g/mol C. 0.19 g/mol D. 137 g/mol E. 384 g/mol What is the pressure in atmospheres exerted by a column of mercury that is 100. m high? (density of mercury = 13.5951 g/cm3, gravitational constant = 9.80665 m/s2, 1 atm = 101,325 Pa = 760 torr = 760 mmHg) Select one: A. 1.37 atm B. 0.013 atm C. 0.73 atm D. 132 atm E. 1.4 × 1010 atm Question 3 Correct 5.00 points out of 5.00Question 6 Correct 5.00 points out of 5.00 Which of the following gas molecules have the highest average kinetic energy at 25°C? Select one: A. H2 B. N2 C. O2 D. Cl2 E. All the gases have the same average kinetic energy. Question 7 Correct 5.00 points out of 5.00 Krypton has a higher melting point than argon because of its Select one: A. stronger dispersion forces. B. greater ionization energy. C. ionic bonds. D. permanent dipole moment. E. hydrogen bonding. 1.00 atm of oxygen gas, placed in a container having a pinhole opening in its side, leaks from the container 2.14 times faster than does 1.000 atm of an unknown gas placed in this same apparatus. Which of the following species could be the unknown gas? Select one: A. Cl2 B. Kr C. UF6 D. Xe E. SF6 Question 5 Correct 5.00 points out of 5.00Question 9 Correct 5.00 points out of 5.00 Which substance has the lowest vapor pressure at room temperature? Select one: A. H2 B. HCl C. HBr D. HI E. HF Question 10 Correct 5.00 points out of 5.00 Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first. Select one: A. Xe, Kr B. H2O, H2S C. C7H16, C5H12 D. CCl4, CBr4 E. CH3CH2OH, CH3–O–CH3 If a molecule at the surface of a liquid has enough kinetic energy to escape the liquid phase and enter the gas phase, then which of the following terms is used to describe this phenomenon? Select one: A. Condensation B. Vaporization C. Gasification D. Sublimation E. Boiling point Question 8 Correct 5.00 points out of 5.00Question 12 Correct 5.00 points out of 5.00 Which one of the following substances crystallizes as a molecular solid? Select one: A. Sn B. SiO2 C. CH3OH D. KI E. Al2(SO4)3 Question 13 Correct 5.00 points out of 5.00 The density of a 20.3 M CH3OH (methanol) solution is 0.858 g/mL. What is the molality of this solution? H2O is the solvent. Select one: A. 70.0 m B. 20.8 m C. 97.8 m D. 23.7 m E. 17.4 m The location that indicates conditions under which two phases can exist in equilibrium is called the Select one: A. phase diagram. B. transition state. C. phase boundary. D. triple point. E. critical point. Question 11 Correct 5.00 points out of 5.00Question 15 Correct 5.00 points out of 5.00 Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed? Select one: A. ΔHsoln ≈ 0, entropy of system decreases B. ΔHsoln 0, entropy of system decreases C. ΔHsoln ≈ 0, entropy of system increases D. ΔHsoln ≈ 0, entropy change of system ≈ 0 E. None of these choices is correct. From the following list of aqueous solutions and water, select the one with the highest boiling point. Select one: A. pure water B. 1.0 M KNO3 C. 2.0 M C12H22O11 (sucrose) D. 0.75 M CuCl2 E. 0.75 M NaCl Question 14 Correct 5.00 points out of 5.00Question 17 Correct 5.00 points out of 5.00 Which substance is present in the largest proportion in a solution? Select one: A. solvent B. solid C. solute D. salute E. gas Question 18 Correct 5.00 points out of 5.00 Which accurately characterizes all nonelectrolyte solutions? Select one: A. Nonelectrolyte solutions conduct heat. B. Nonelectrolyte solutions do not conduct electricity. C. Nonelectrolyte solutions conduct electricity. D. Nonelectrolyte solutions react with other solutions. E. Nonelectrolyte solutions contain molecules. What volume of ethanol (density = 0.7893 g/cm3) should be added to 450. mL of water in order to have a solution that freezes at –15.0°C? Assume the density of water is 1.0 g/mL. (For water, Kf = 1.86°C/m.) Select one: A. 470 mL B. 212 mL C. 132 mL D. 371 mL E. 167 mL Question 16 Correct 5.00 points out of 5.00Question 20 Correct 5.00 points out of 5.00 Calculate the pH of the solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M HCN (Ka = 4.9 × 10–10) solution. Select one: A. 5.85 B. 8.71 C. 5.15 D. 13.0 E. 9.91 What is defined as the selective passage of solvent molecules through a porous membrane from a more dilute solution to a more concentrated solution? Select one: A. Osmosis B. Vapor pressure C. Permeability D. Semipermeability E. Osmotic pressure Question 19 Correct 5.00 points out of 5.00Which one of the following is the best representation of the titration curve which will be obtained in the titration of a weak diprotic acid H2A (0.10 M) with a strong base of the same concentration? Select one: A. B. Question 21 Correct 5.00 points out of 5.00C. D. E.Suppose 3.0 × 10–3 mol of NaOH are added to 6.0 × 10–3 mol of the weak acid HA. Which is the best representation of the final solution at equilibrium? (Each circle represents 1.0 × 10–3 mol of atoms, and the volume of each box is 1.0 L. Solvent water molecules are omitted for clarity.) Select one: A. B. Question 22 Correct 5.00 points out of 5.00C. D. E.Question 24 Correct 5.00 points out of 5.00 What is the [H3O+] in a buffer that consists of 0.30 M HCOOH and 0.20 M HCOONa? [Ka(HCOOH) = 1.7 × 10–4] Select one: A. 1.1 × 10–4 M B. 2.6 × 10–4 M C. 1.7 × 10–4 M D. 4.3 × 10–4 M E. 6.7 × 10–5 M Question 25 Correct 5.00 points out of 5.00 If 50.0 mL of 1.2 × 10–3 M Pb(NO3)2 are added to 50.0 mL of 2.0 × 10–4 M Na2S, what takes place? Select one: A. A precipitate of PbS forms. B. A precipitate of Pb(NO3)2 forms. C. No precipitate forms. D. A precipitate of NaNO3 forms. E. A precipitate of Na2S forms. Which indicator would be the best to use if 0.050 M benzoic acid (Ka = 6.6 × 10–5) is titrated with 0.050 M NaOH? Select one: A. phenol red, pH range: 6.9–8.5 B. bromcresol green, pH range: 3.8–5.4 C. bromphenol blue, pH range: 3.0–4.5 D. alizarin, pH range: 5.7–7.2 Question 23 Correct 5.00 points out of 5.00© 2023 StraighterLine. All rights reserved Quiz navigation 1 2 3 4 5 6 7 8 9 10 Show one page at a time Finish review