Which of the following is incorrect? A. A change in phase is not accompanied by a...
Which of the following is incorrect?
A. A change in phase is not accompanied by a change in temperature.
B. Kinetic energy of a chemical system involves the energy of motion of atoms, ions, and molecules in the system.
C. A bomb calorimeter measures heat exchange at constant volume.
D. A substance in a solid state which changes directly to a gas has undergone a sublimation reaction.
E. All of the above statements are correct.
Homework Answers
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Which of the following is incorrect?
A. A change in phase is not accompanied by a...
During the phase change from ice to water, which of the following statements is unlikely to...
During the phase change from ice to water, which of the following statements is unlikely to be true regarding the ice-water mixture? Its entropy does not change. Its heat exchange with environment cannot be zero. Its temperature does not change. Its kinetic energy of molecules does not change.
B. Calculation of Heat during phase change. A phase change is a physical process in which...
B. Calculation of Heat during phase change. A phase change is a physical process in which a substance goes from one phase to another. The temperature of a substance does not change as the substance goes from one phase to another. The heat of fusion (AHfus) is the amount of heat per gram (or per mole) required for a phase change that occurs at the melting point. The heat of vaporization, (Hvap) is the amount of heat per gram (or...
27. When a solid converts directly to the gas phase, the process is called sublimation. boiling....
27. When a solid converts directly to the gas phase, the process is called sublimation. boiling. condensation. deposition. 28. Which atom requires the least energy to remove an electron from its valence shell?! a) F b) al c) Br d) 29. How many atoms are in 22.3 g of iron (Fe)? a) 2.40 x 1023 atoms b) 1.51 x 1024 atoms c) 1.34 x 1025 atoms d) 7.50 x 1024 atoms
4. The other phase change that can happen is liquid to gas. Similar to the phase...
4. The other phase change that can happen is liquid to gas. Similar to the phase change of solid to liquid, the temperature of the system does not change. All of the energy goes into the phase change. Only now instead of the latent heat of fusion, we have the latent heat of vaporization: Q = mly How much heat must be added to 3.8 kg (1 gallon) of water for half of it to be changed into gas? The...
4. The other phase change that can happen is liquid to gas. Similar to the phase...
4. The other phase change that can happen is liquid to gas. Similar to the phase change of solid to liquid, the temperature of the system does not change. All of the energy goes into the phase change. Only now instead of the latent heat of fusion, we have the latent heat of vaporization: Q = mL How much heat must be added to 3.8 kg (1 gallon) of water for half of it to be changed into gas? The...
The following claim was made in the introduction: Evaporation, or vaporization, is a type of phase change that result wh...
The following claim was made in the introduction: Evaporation, or vaporization, is a type of phase change that result when liquid molecules have sufficient energy to escape the attractive forces of neighboring liquid molecules to become gas molecules. 1- how does the kinetic energy of the molecules leaving the thermometer compare to the kinetic energy of the molecules that remain on the Kimwipe
9. The phase diagram for Xenon is provided opposite Liquid What phase change(s) occur as Xenon...
9. The phase diagram for Xenon is provided opposite Liquid What phase change(s) occur as Xenon is cooled from room temperature to -150°C at 2 atm pressure 100 Solid 10 Deposition only Condensation then Freezing а) b) Gas c) Melting then Vaporisation 0.1 d) Condensation then Sublimation 0.01 Sublimation only е) -180 -120 -60 0 60 Temperature (C) 10. A schematic phase diagram is shown below. The temperature and pressure defining the (solid,liquid,gas) triple point (Tip,Pp) and the critical point...
M Review Constants | Periodic Table Part A Calorimetry is a method used to measure changes...
M Review Constants | Periodic Table Part A Calorimetry is a method used to measure changes in enthalpy, or heat, that occur during chemical processes. Two common calorimeters are constant-pressure calorimeters and constant-volume (or "bomb") calorimeters. Bomb calorimeters are used to measure combustion and other gas-producing reactions, in which the reaction is observed in a strong, sealed vessel. A simple constant-pressure calorimeter can be made from a foam coffee cup and a thermometer, in which energy changes in a reaction...
QUESTION 7 Which of the following is a chemical change? O a. A damp towel dries....
QUESTION 7 Which of the following is a chemical change? O a. A damp towel dries. b. Peanuts are crushed. O c Water condenses on a mirror. O d. At least two of the above (a-d) exhibit a chemical change. e. A "tin" can rusts QUESTION 8 A homogeneous mixture is also called a. a compound. b. a pure substance. c. a heterogeneous mixture. d. a solution. e. an element. QUESTION 9 In which phase of water are the molecules...
Which of the following is not part of the kinetic-molecular theory? a) The volume occupied by all of the gas molecules...
Which of the following is not part of the kinetic-molecular theory? a) The volume occupied by all of the gas molecules in a container is negligible compared to the volume of the container. b) Collisions between gas molecules do not result in the loss of energy. c) Attractive and repulsive forces between gas molecules are negligible. d) Gases consist of molecules in continuous, random motion. Atoms are neither created nor destroyed by ordinary chemical reactions
During the phase change from ice to water, which of the following statements is unlikely to be true regarding the ice-water mixture? Its entropy does not change. Its heat exchange with environment cannot be zero. Its temperature does not change. Its kinetic energy of molecules does not change.
B. Calculation of Heat during phase change. A phase change is a physical process in which a substance goes from one phase to another. The temperature of a substance does not change as the substance goes from one phase to another. The heat of fusion (AHfus) is the amount of heat per gram (or per mole) required for a phase change that occurs at the melting point. The heat of vaporization, (Hvap) is the amount of heat per gram (or...
27. When a solid converts directly to the gas phase, the process is called sublimation. boiling. condensation. deposition. 28. Which atom requires the least energy to remove an electron from its valence shell?! a) F b) al c) Br d) 29. How many atoms are in 22.3 g of iron (Fe)? a) 2.40 x 1023 atoms b) 1.51 x 1024 atoms c) 1.34 x 1025 atoms d) 7.50 x 1024 atoms
4. The other phase change that can happen is liquid to gas. Similar to the phase change of solid to liquid, the temperature of the system does not change. All of the energy goes into the phase change. Only now instead of the latent heat of fusion, we have the latent heat of vaporization: Q = mly How much heat must be added to 3.8 kg (1 gallon) of water for half of it to be changed into gas? The...
4. The other phase change that can happen is liquid to gas. Similar to the phase change of solid to liquid, the temperature of the system does not change. All of the energy goes into the phase change. Only now instead of the latent heat of fusion, we have the latent heat of vaporization: Q = mL How much heat must be added to 3.8 kg (1 gallon) of water for half of it to be changed into gas? The...
9. The phase diagram for Xenon is provided opposite Liquid What phase change(s) occur as Xenon is cooled from room temperature to -150°C at 2 atm pressure 100 Solid 10 Deposition only Condensation then Freezing а) b) Gas c) Melting then Vaporisation 0.1 d) Condensation then Sublimation 0.01 Sublimation only е) -180 -120 -60 0 60 Temperature (C) 10. A schematic phase diagram is shown below. The temperature and pressure defining the (solid,liquid,gas) triple point (Tip,Pp) and the critical point...
M Review Constants | Periodic Table Part A Calorimetry is a method used to measure changes in enthalpy, or heat, that occur during chemical processes. Two common calorimeters are constant-pressure calorimeters and constant-volume (or "bomb") calorimeters. Bomb calorimeters are used to measure combustion and other gas-producing reactions, in which the reaction is observed in a strong, sealed vessel. A simple constant-pressure calorimeter can be made from a foam coffee cup and a thermometer, in which energy changes in a reaction...
QUESTION 7 Which of the following is a chemical change? O a. A damp towel dries. b. Peanuts are crushed. O c Water condenses on a mirror. O d. At least two of the above (a-d) exhibit a chemical change. e. A "tin" can rusts QUESTION 8 A homogeneous mixture is also called a. a compound. b. a pure substance. c. a heterogeneous mixture. d. a solution. e. an element. QUESTION 9 In which phase of water are the molecules...
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