CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions and Answers_ 100% all correct Latest Fall 2026.

CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions Question 1 (4 points) We learned about phase changes, such as when a liquid turns into a gas (boiling). The temperature at which this occurs is known as the boiling point, which would be highest in which of these compounds? Question 1 options: N2 not enough information CO O2 CO2 Question 2 (4 points) Why are water's chemical and physical properties so unique? Question 2 options: all of the above the ability to form hydrogen bonds.CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions high surface tension and low volatility. moderate viscosity and expanding upon freezing. dispersion forces. Question 3 (4 points) Which term is used to describe when a substance changes from a liquid to a gas? Question 3 options: heat of fusion. dynamic equilibrium. volatile. vaporization. condensation. Question 4 (4 points) Consider two processes that are working against or opposite one another, and doing so at equal rates, but no overall net change is observed. What term describes such a situation? Question 4 options: condensation.CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions none of the above dynamic equilibrium. vaporization. evaporation. Question 5 (4 points) How might one go about increasing the vapor pressure of a liquid? Question 5 options: all of the above increase the temperature. establish dynamic equilibrium. use a nonvolatile compound. increase the viscosity. Question 6 (4 points) The compounds listed below all have different boiling points. Which would have the highest? Question 6 options:CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions CH4 C H3C(O)C H3 CH3CH3 CH3CH2OH Question 7 (4 points) So you have a solid substance. So you start to add heat to it. What happens as you start to do this? Question 7 options: Heating of the now formed liquid results in increasing the liquid temperature. all of the above Increasing the rate of heating of a substance at its melting point only causes more rapid melting.CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions Thermal energy causes the components of the solid to vibrate faster. When the melting point is reached, the thermal energy is sufficient to overcome intermolecular forces holding the components at their stationary points. Question 8 (4 points) We learned about phase changes in this lesson. Which of these describes the phase change known as evaporation? Question 8 options: a cooling process for humans when they sweat. increased by increasing temperature. all of the above an endothermic process. the opposite process as condensation. Question 9 (4 points) When you put water into an ice cube tray and stick it in the freezer to make ice, which of these is true? Question 9 options:CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions it is an exothermic process. it is an endothermic process. none of the above the process is referred to scientifically as sublimation. the heat of vaporization must be removed. Question 10 (4 points) As we learned, matter exists in different states: solid, liquid, and gas. Which one of these could be described as having low density and easily compressible? Question 10 options: gases liquids both solids and liquids solids Question 11 (4 points) What intermolecular force or bond is primarily responsible for the solubility of CH3OH in water?CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions Question 11 options: ionic bonding dipole-dipole force ion-dipole force covalent bonding hydrogen bonding Question 12 (4 points) Which one of the following is an example of a covalent network solid? Question 12 options: I2CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions SiO2 CaCl2 K Question 13 (4 points) Copper has a face-centered cubic unit cell. How many copper atoms are in each unit cell? Question 13 options: 4 6 8 2 Question 14 (4 points)CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions Freon-113, C2Cl3F3, has an enthalpy of vaporization of 27.0 kJ/mol and a normal boiling point of 48.0 °C. What is the vapor pressure (in atm) of Freon-113 at 40.3 °C? (R = 8.314 J/K·mol) Question 14 options: 2.43 x 10-6 atm 1.28 atm 0.127 atm 0.780 atm 1.00 atm Question 15 (4 points) Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V? Question 15 options:CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions 2.98 × 10–6 g/cm3 5.96 × 10–30 g/cm3 2.98 g/cm3 11.9 g/cm3 5.96 g/cm3 Question 16 (4 points) The bonds between hydrogen and oxygen within a water molecule can be characterized as __________. Question 16 options: London dispersion forces dispersion forces hydrogen bondsCHEM133 Fall 2025 Week 13 Lesson 6 Study Questions intramolecular forces intermolecular forces Question 17 (4 points) The vapor pressure of a pure liquid increases as the: Question 17 options: average kinetic energy of the molecules in the liquid phase decreases. intermolecular attractive forces increase. temperature of the liquid phase increases. temperature of the liquid phase decreases. Question 18 (4 points) The phase diagram for CO2 has a triple point at –56.6 °C and 5.19 atm, and a critical point at 31.0 °C and 73 atm. The solid and gas phases are inCHEM133 Fall 2025 Week 13 Lesson 6 Study Questions equilibrium at –78.7 °C and 1.00 atm. Which of the following statements regarding CO2 is/are correct? 1) Sublimation occurs if the temperature of the solid phase is increased from –79.0 °C to 0.0 °C at a constant pressure of 2.5 atm. 2) CO2 is a supercritical fluid at 55 °C and 75 atm. 3) At pressures greater than its critical pressure (73 atm), CO2 will not exist as a solid at any temperature. Question 18 options: 1, 2, and 3 1 only 1 and 2 3 only 2 onlyCHEM133 Fall 2025 Week 13 Lesson 6 Study Questions Question 19 (4 points) Which is expected to have the largest dispersion forces? Question 19 options: N2 C2H6 CO2 C8H18 Question 20 (4 points) Determine the packing efficiency of a simple cubic unit cell that contains one atom with a metallic radius of 175 pm. Question 20 options: 52.2 % 55.8 %CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions 53.7 % 51.2 % Question 21 (4 points) The number of atoms in a body-centered cubic unit cell is: Question 21 options: 3 4 8 1 2 Question 22 (4 points) Consider the following list of liquids and their boiling points: ether, bp = 35°C acetone, bp = 56°C cyclohexane, bp = 80°C water, bp = 100°CCHEM133 Fall 2025 Week 13 Lesson 6 Study Questions Which liquid is predicted to have the largest vapor pressure near room temperature (25° C)? Question 22 options: ether cyclohexane water acetone cannot tell with the information given Question 23 (4 points) Solids having no ordered long-range structure are classified as: Question 23 options: molecular amorphousCHEM133 Fall 2025 Week 13 Lesson 6 Study Questions metallic crystalline Question 24 (4 points) Calculate the density of metallic copper, which has a face-centered cubic unit cell with an edge length of 361.5 pm. Question 24 options: 14.51 g/cm3 8.935 g/cm3 19.27 g/cm3 17.49 g/cm3 Question 25 (4 points) The experimentally measured vapor pressure of SO2 at -25oC is 49.5 kPa and at 0oC is 155 kPa. Determine the enthalpy of vaporization, ΔHvap, at 100 oC. Question 25 options:CHEM133 Fall 2025 Week 13 Lesson 6 Study Questions 8549 torr 3230 torr 4150 torr 9821 torr