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12. Which statement is always true for an exothermic reaction? A) The enthalpy change is negative....
19. An exothermic reaction has A. has a negative AH and absorbs heat from the surroundings....
19. An exothermic reaction has A. has a negative AH and absorbs heat from the surroundings. An exothermic reaction feels warm to the touch. B. has a positive AH and absorbs heat from the surroundings. An exothermic reaction feels warm to the touch. C. has a positive AH and gives off heat to the surroundings. An exothermic reaction feels warm to the touch. D. has a negative AH and gives off heat to the surroundings. An exothermic reaction feels warm...
Which statements are true? Δ?ΔH for an exothermic reaction is positive. When energy is transferred as...
Which statements are true? Δ?ΔH for an exothermic reaction is positive. When energy is transferred as heat from the surroundings to the system, Δ?ΔH is negative. When energy is transferred as heat from the system to the surroundings, Δ?ΔH is negative. The evaporation of water is an exothermic process. Δ?ΔH for an endothermic reaction is positive. A combustion reaction is exothermic.
13. Indicate whether the following statements are true or false. If false, correct the statement so...
13. Indicate whether the following statements are true or false. If false, correct the statement so that it is true. a. A change in enthalpy for exothermic chemical reactions is negative. b. An endothermic reaction is one in which enthalpy is absorbed by the system from the surroundings. c. Condensation of water vapor is an example of an endothermic process. d. Heat, q, and enthalpy, AH, are state functions, meaning they depend on the path taken, and q = AH....
10. Select the correct statement. A) In an exothermic reaction, the surroundings releases heat. ...
10. Select the correct statement. A) In an exothermic reaction, the surroundings releases heat. B) If the sign of w is negative, the reaction is always exothermic. C) If ΔE is negative, the reaction is always exothermic. D) When the surroundings gains heat, the reaction is exothermic.
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...
Chemical energy stored in the reactants is released as heat when the reaction is exothermic. For...
Chemical energy stored in the reactants is released as heat when the reaction is exothermic. For an exothermic reaction, the enthalpy change for a reaction is negative. Enthalpy, represented as H, is the heat content of a system. As it is a state function, it depends on the state of the system; hence, it is calculated in the form of change in heat content. Heat change, or enthalpy change, is represented as ΔH; ΔH is a measure of the heat...
Question 12 (5 points) (12) For an acid - base neutralization reaction, which statement is true?...
Question 12 (5 points) (12) For an acid - base neutralization reaction, which statement is true? (b) It absorbs heat, and is exothermic. (a) It releases heat, and is exothermic. (c) It releases heat, and is endothermic (d) It absorbs heat, and it is endothermic. Question 13 (7 points) (13) In an acid-base reaction, 1 M of 100 ml. HCl(aq) is used to react with NaOH (aq). What is the mole number of HCI used? O(a) 1 mole (b) 0.1...
Which statement is true? A. Spontaneous changes are always accompanied by an increase in the enthalpy...
Which statement is true? A. Spontaneous changes are always accompanied by an increase in the enthalpy of the system. B. Spontaneous changes are always accompanied by a decrease in the entropy of the system. C. Spontaneous changes are always accompanied by a decrease in the enthalpy of the system. D. Most highly exothermic chemical reactions are also spontaneous chemical reactions. E. Spontaneous changes are always accompanied by an increase in the entropy of the system. For a certain chemical reaction,...
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of...
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of H, are reacted? N; (g) + 3H2(g) → 2NH, (g): AH = -91.2 kJ (A) -452 kJ (B) +452 kJ (C) -151 kJ (D) -1357 kJ 11. Which of the following is NOT a state function? 1. Heat 2. Change in enthalpy 3. Change in internal energy 4. Change in pressure (A) 1 only (B) 2 only (C) 2 and 3 (D) 1 and...
A spontaneous reaction Select one: a. is always exothermic. b. may be exothermic or endothermic. c....
A spontaneous reaction Select one: a. is always exothermic. b. may be exothermic or endothermic. c. is always endothermic. d. does not involve any heat exchange with surroundings. Which one? Need help please!
19. An exothermic reaction has A. has a negative AH and absorbs heat from the surroundings. An exothermic reaction feels warm to the touch. B. has a positive AH and absorbs heat from the surroundings. An exothermic reaction feels warm to the touch. C. has a positive AH and gives off heat to the surroundings. An exothermic reaction feels warm to the touch. D. has a negative AH and gives off heat to the surroundings. An exothermic reaction feels warm...
13. Indicate whether the following statements are true or false. If false, correct the statement so that it is true. a. A change in enthalpy for exothermic chemical reactions is negative. b. An endothermic reaction is one in which enthalpy is absorbed by the system from the surroundings. c. Condensation of water vapor is an example of an endothermic process. d. Heat, q, and enthalpy, AH, are state functions, meaning they depend on the path taken, and q = AH....
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 12 (5 points) (12) For an acid - base neutralization reaction, which statement is true? (b) It absorbs heat, and is exothermic. (a) It releases heat, and is exothermic. (c) It releases heat, and is endothermic (d) It absorbs heat, and it is endothermic. Question 13 (7 points) (13) In an acid-base reaction, 1 M of 100 ml. HCl(aq) is used to react with NaOH (aq). What is the mole number of HCI used? O(a) 1 mole (b) 0.1...
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of H, are reacted? N; (g) + 3H2(g) → 2NH, (g): AH = -91.2 kJ (A) -452 kJ (B) +452 kJ (C) -151 kJ (D) -1357 kJ 11. Which of the following is NOT a state function? 1. Heat 2. Change in enthalpy 3. Change in internal energy 4. Change in pressure (A) 1 only (B) 2 only (C) 2 and 3 (D) 1 and...
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