can dissolve many polar and ionic compounds. b. No molecule of similar size has as high a boiling point. c. all of the above Correct d. No molecule of similar size is a liquid at room temperature. e. Water expands upon freezing. Feedback The correct answer is: 15.3 Correct Marks for this submission: 1.00/1.00. Question 3 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text What is the heat of vaporization(kJ/mol) if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point? Select one: a. 1288 b. 12.2 c. more information is needed d. 1.29 Correct e. 0.776 Feedback The correct answer is: 1.29 Correct Marks for this submission: 1.00/1.00. Question 4 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text What are the principal forces holding ice together? Select one: a. dispersion forces only b. intermolecular forces Correct c. none of these choices d. sea of electrons e. electrostatic attraction Feedback The correct answer is: intermolecular forces Correct Marks for this submission: 1.00/1.00. Question 5 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which state of matter has a low density and an indefinite volume? Select one: a. none of these choices b. both solids and liquids c. gases Correct d. solids e. liquids Feedback The correct answer is: gases Correct Marks for this submission: 1.00/1.00. Question 6 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which intermolecular forces are found in CO2? Select one: a. dispersion forces Correct b. dipole-dipole forces c. dispersion forces and dipole-dipole forces d. none of these choices e. hydrogen bonding Feedback The correct answer is: dispersion forces Correct Marks for this submission: 1.00/1.00. Question 7 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text The opposite process of freezing is: Select one: a. sublimation. b. evaporation. c. none of these choices Correct d. boiling. e. condensation. Feedback The correct answer is: none of these choices Correct Marks for this submission: 1.00/1.00. Question 8 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text A 250 gram sample of water at the boiling point had 45.0 kJ of heat added. How many grams of water were vaporized? Select one: a. 20.0 Correct b. none of these choices c. 16.2 d. 1.11 e. 0.902 Feedback The correct answer is: 20.0 Correct Marks for this submission: 1.00/1.00. Question 9 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which state of matter has a low density and is easily compressed? Select one: a. liquids b. both solids and liquids c. solids d. gases Correct e. none of these choices Feedback The correct answer is: gases Correct Marks for this submission: 1.00/1.00. Question 10 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which statement is TRUE in describing what occurs when a solid melts to a liquid? Select one: a. not enough information b. The process is exothermic and the heat of fusion is negative. c. The process is exothermic and the heat of fusion is positive. d. The process is endothermic and the heat of fusion is positive. Correct e. The process is endothermic and the heat of fusion is negative. Feedback The correct answer is: The process is endothermic and the heat of fusion is positive. Correct Marks for this submission: 1.00/1.00. Question 11 Correct Mark 0.67 out of 1.00 Not flaggedFlag question Question text The reason for many of the unique properties of water is: Select one: a. dispersion forces. b. all of the above c. high surface tension and low volatility. d. moderate viscosity and expanding upon freezing. e. the ability to form hydrogen bonds. Correct Feedback The correct answer is: the ability to form hydrogen bonds. Correct Marks for this submission: 1.00/1.00. Accounting for previous tries, this gives 0.67/1.00. Question 12 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text How much energy does it take to melt a 16.87 g ice cube? Select one: a. 108 kJ b. 102 kJ c. none of these choices d. 936 J e. 5.64 kJ Correct Feedback The correct answer is: 5.64 kJ Correct Marks for this submission: 1.00/1.00. Question 13 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Compare a small pot of water that is boiling vigorously to a large pot of water that is boiling gently. Which statement is TRUE? Select one: a. The vapor pressure of the liquid is greater than the pressure above the pot in each case. b. The large pot is boiling at a higher temperature than the small pot. c. none of these statements are true. d. Both pots are boiling at the same temperature. Correct e. The small pot is boiling at higher temperature than the large pot. Feedback The correct answer is: Both pots are boiling at the same temperature. Correct Marks for this submission: 1.00/1.00. Question 14 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which substance would be expected to have the highest boiling point? Select one: a. CO2 b. O2 c. N2 d. not enough information e. CO Correct Feedback The correct answer is: CO Correct Marks for this submission: 1.00/1.00. Question 15 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Assuming that the molecules carbon monoxide (CO) and nitrogen (N2) have similar electron clouds, which statement below is TRUE? Select one: a. The N2 has the higher boiling point because it has greater dispersion forces. b. none of these choices c. CO has the higher boiling point because it experiences dipole-dipole forces. Correct d. N2 has the higher boiling point because it experiences dipole-dipole forces. e. Both CO and N2 must have the same boiling point. Feedback The correct answer is: CO has the higher boiling point because it experiences dipole-dipole forces. Correct Marks for this submission: 1.00/1.00. Question 16 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which molecule below has hydrogen bonding (hint: it may help to look at the lewis structures)? Select one: a. HF b. NH3 c. all of the above Correct d. H2O e. CH3OH Feedback The correct answer is: all of the above Correct Marks for this submission: 1.00/1.00. Question 17 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which intermolecular force increases with increasing size of an atom? Select one: a. dipole-dipole forces b. dispersion forces Correct c. none of these choices d. hydrogen bonding e. X-forces Feedback The correct answer is: dispersion forces Correct Marks for this submission: 1.00/1.00. Question 18 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Increasing the intermolecular forces of a liquid will do which of the following? Select one: a. decrease the evaporation rate b. increase the viscosity c. all of the above Correct d. increase the surface tension e. decrease the vapor pressure Feedback The correct answer is: all of the above Correct Marks for this submission: 1.00/1.00. Question 19 Correct Mark 1.00 out of 1.00 Not flaggedFlag question Question text Which intermolecular force is due to the formation of an instantaneous dipole? Select one: a. dipole-dipole forces b. dispersion forces Correct c. X-forces d. hydrogen bonding e. none of these choices Feedback The correct answer is: dispersion forces Correct Marks for this submission: 1.00/1.00. Question 20 Correct Mark 0.67 out of 1.00 Not flaggedFlag question Question text Which statement below is FALSE? Select one: a. A hydrogen bond is the strongest of the intermolecular forces. b. The large electronegativity difference between hydrogen and an F, O, or N atom is essential for the formation of a hydrogen bond. c. A hydrogen bond is only 2-5% the strength of a typical covalent bond. d. A hydrogen atom must be bonded directly to fluorine, oxygen, or nitrogen to exhibit hydrogen bonding. e. none of these choices Correct