Homework Answers
a) heat is transferred from system to Surroundings thus sign of q is negative.
b) work is done on the system thus w is positive.
c) delta E is towards the system thus 
E is positive.
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1. For the following diagrams, indicate the sign of the variable specified. surroundings system a. q...
5. 83 kJ of heat are exchanged between the system and surroundings in an endothermic reaction,...
5. 83 kJ of heat are exchanged between the system and surroundings in an endothermic reaction, and the system does 2.0 k) of work on the surroundings. Which of the following statements are true? a. q>0, w <0, AE >O b. q<0, w<O, AE > C. q< 0, w < 0, AE < 0 d. 9>0, w >O, AE > e. The answer cannot be determined from the information provided
Which of the following signs on q and w represent the surroundings that is doing work...
Which of the following signs on q and w represent the surroundings that is doing work on the system, as well as losing heat to the surroundings? a) q = +, w = + b) q = +, w = - c) q = -, w = - d) None of these represent the system referenced above. e) q = -, w = +
5. For a particular process, q=-17 kJ and w = 21 kJ. Which of the following...
5. For a particular process, q=-17 kJ and w = 21 kJ. Which of the following statements is false? a. Heat flows from the system to the surroundings. b. The system does work on the surroundings. c. AE = +4 kJ d. The process is exothermic. e. None of the above is false.
A system which does work on the surroundings with no heat change (i.e., q = 0)...
A system which does work on the surroundings with no heat change (i.e., q = 0) has: Ow=AU Ow=-AU w>0, AU < 0 O w<0, AU > 0 Ο w > Δυ Question 2 4 pts For the reaction: 2A + B2 -> 2AB AH = +50.0 kJ. The reaction is endothermic The bond energy for each A-B bond is 50.0 kJ The molecule AB contains less energy than A or B2 Heat is released to the surroundings
For melting water at 25 C, what is the sign of delta S for system, surroundings...
For melting water at 25 C, what is the sign of delta S for system, surroundings and universe? I'm thinking delta S would be positive for the system, but what about the others?
Match the following. Drag the appropriate labels to their respective targets Reset Help system loses thermal...
Match the following. Drag the appropriate labels to their respective targets Reset Help system loses thermal energy to the surrounding energy associated with the motion of an object energy associated with the temperature of an object energy associated with the position of an object energy associated with the relative positions of energy flows into the system from the surrounding potential energy thermal energy electrons and nuclei in atoms and molecules -AE +AE system gains thermal energy from the surroundings energy...
1. A gas absorbs 0.0 J of heat and then performs 30.8 J of work. The change in internal energy of the gas is a. 61....
1. A gas absorbs 0.0 J of heat and then performs 30.8 J of work. The change in internal energy of the gas is a. 61.6 J. b. 30.8 J. c. -61.6 J. d.-30.8 J. e. none of these 2. Which of the following statements correctly describes the signs of q and w for the following exothermic process at P= 1 atm and T = 370 K? H2O(g) → H2O(1) a. q and w are negative. b. is positive, wis...
Which of the following statements is true? A) w and ΔV have the same sign because...
Which of the following statements is true? A) w and ΔV have the same sign because the gas expands, work flows into the surroundings B) w and ΔV have the opposite sign because the gas expands, work flows into the surroundings C) w and ΔV have the same sign because the gas expands, work flows out of the surroundings D) w and ΔV have the opposite sign because the gas expands, work flows out of the surroundings
QUESTION 7 When heat is not exchanged between a system and its surroundings (q = 0),...
QUESTION 7 When heat is not exchanged between a system and its surroundings (q = 0), which one of the following terms is used to describe the process? O A. adiabatic B. isothermal C. isochoric OD. isobaric E. endothermic QUESTION 8 A photon possesses an energy of 1.35 x 10-18 Joules of energy. What is the wavelength of this photo in nanometers (nm)? Remember: E= hv&vBot;and C = v, where c= 3.00 x 100 meters/second.
Calculate AE for each of the following. (a) a = -34 k), w = +88 kJ...
Calculate AE for each of the following. (a) a = -34 k), w = +88 kJ Ok] (b) q = +82 k), W = +40. kJ CkJ (c) 9 = +33 k), w = 0 Ok] (d) In which of these cases do the surroundings do work on the system? (Select all that apply.) case a case b casec O none of the cases
5. 83 kJ of heat are exchanged between the system and surroundings in an endothermic reaction, and the system does 2.0 k) of work on the surroundings. Which of the following statements are true? a. q>0, w <0, AE >O b. q<0, w<O, AE > C. q< 0, w < 0, AE < 0 d. 9>0, w >O, AE > e. The answer cannot be determined from the information provided
5. For a particular process, q=-17 kJ and w = 21 kJ. Which of the following statements is false? a. Heat flows from the system to the surroundings. b. The system does work on the surroundings. c. AE = +4 kJ d. The process is exothermic. e. None of the above is false.
A system which does work on the surroundings with no heat change (i.e., q = 0) has: Ow=AU Ow=-AU w>0, AU < 0 O w<0, AU > 0 Ο w > Δυ Question 2 4 pts For the reaction: 2A + B2 -> 2AB AH = +50.0 kJ. The reaction is endothermic The bond energy for each A-B bond is 50.0 kJ The molecule AB contains less energy than A or B2 Heat is released to the surroundings
Match the following. Drag the appropriate labels to their respective targets Reset Help system loses thermal energy to the surrounding energy associated with the motion of an object energy associated with the temperature of an object energy associated with the position of an object energy associated with the relative positions of energy flows into the system from the surrounding potential energy thermal energy electrons and nuclei in atoms and molecules -AE +AE system gains thermal energy from the surroundings energy...
1. A gas absorbs 0.0 J of heat and then performs 30.8 J of work. The change in internal energy of the gas is a. 61.6 J. b. 30.8 J. c. -61.6 J. d.-30.8 J. e. none of these 2. Which of the following statements correctly describes the signs of q and w for the following exothermic process at P= 1 atm and T = 370 K? H2O(g) → H2O(1) a. q and w are negative. b. is positive, wis...
QUESTION 7 When heat is not exchanged between a system and its surroundings (q = 0), which one of the following terms is used to describe the process? O A. adiabatic B. isothermal C. isochoric OD. isobaric E. endothermic QUESTION 8 A photon possesses an energy of 1.35 x 10-18 Joules of energy. What is the wavelength of this photo in nanometers (nm)? Remember: E= hv&vBot;and C = v, where c= 3.00 x 100 meters/second.
Calculate AE for each of the following. (a) a = -34 k), w = +88 kJ Ok] (b) q = +82 k), W = +40. kJ CkJ (c) 9 = +33 k), w = 0 Ok] (d) In which of these cases do the surroundings do work on the system? (Select all that apply.) case a case b casec O none of the cases
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