**Title:** Analyzing Reaction Enthalpy and Entropy**Instructions:** Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy \( \Delta H \) and reaction entropy \( \Delta S \).**Note:** If you have not been given enough information to decide a sign, select the "unknown" option.| **Reaction** | **Observations** | **Conclusions** ||--------------|------------------|-----------------|| A | The reaction is never spontaneous. | \( \Delta H \) is [pick one: positive, negative, unknown] \( \Delta S \) is [pick one: positive, negative, unknown] || B | This reaction is faster above \(-26.°C\) than below. | \( \Delta H \) is [pick one: positive, negative, unknown] \( \Delta S \) is [pick one: positive, negative, unknown] || C | This reaction is spontaneous only above \(37.°C\) but proceeds at a slower rate below \(159.°C\). | \( \Delta H \) is [pick one: positive, negative, unknown] \( \Delta S \) is [pick one: positive, negative, unknown] |

The spontaneity of any chemical reaction can be predicted from the change in Gibbs free energy value…

Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) the reaction enthalpy AH and reaction entropy A.S. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A B с observations The reaction is never spontaneous. This reaction is faster above-26. °C than below. This reaction is spontaneous only above 37. °C but proceeds at a slower rate below 159. °C. conclusions AH is AS is AH is AS is AH is AS is X (pick one) positive negative unknown (pick one) (pick one) (pick one) (pick one)

Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) the reaction enthalpy AH and reaction entropy A.S. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A B с observations The reaction is never spontaneous. This reaction is faster above-26. °C than below. This reaction is spontaneous only above 37. °C but proceeds at a slower rate below 159. °C. conclusions AH is AS is AH is AS is AH is AS is X (pick one) positive negative unknown (pick one) (pick one) (pick one) (pick one)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy A.S. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction B C observations This reaction is always spontaneous, but proceeds faster at temperatures below 121. °C. Crystallization of a pure compound is spontaneous only below 109. °C. This reaction is exothermic and proceeds faster at temperatures above 34. °C. conclusions AH is AS is AH is AS is AH is AS is X (pick one) ✓ (pick one) (pick one) (pick one) (pick one) (pick one) Ś
One mole of an ideal gas undergoes the cycle, A⟶B⟶C⟶A, as shown in the graph. For this gas, CV = 1.5R. Step C⟶A is isothermal and reversible. 1) Calculate W for each step in the process.
For: 2 NO (g) + Cl2 (g) → 2 NOCl (g) the ΔHo is −37.78 kJ and ΔSo is −117.03 J/K. As the temperature increases: A. ΔGo increases B. ΔGo decreases C. the reaction becomes more spontaneous D. ΔGo becomes more negative E. nothing happens
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A B C observations This reaction is always spontaneous, but proceeds faster at temperatures below 140. °C. The reaction is never spontaneous. This reaction is spontaneous only above 129. °C but proceeds at a slower rate below 192. °C. AH is AS is conclusions AH is AS is AH is AS is X ✓ (pick one) positive negative unknown (pick one) î (pick one) (pick one) C Ś ↑ (pick one) î
Nn.78. Subject :- Chemistry
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy A.S. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A B с observations This reaction is spontaneous only above 30. °C but proceeds at a slower rate below 199. °C. This reaction is spontaneous only below 19. °C. This reaction is exothermic and proceeds slower at temperatures below 60. °C. conclusions AH is AS is AH is AS is AH is AS is X (pick one) (pick one) (pick one) ✓ (pick one) (pick one) (pick one) Ś
For the reaction of gaseous substances with increasing gaseous molecules (from reactant to product side) and given the ΔH° that is +150 kJ/mol and ΔS° that is +171 J/K ∙ mol, how can you describe this reaction? a. It is spontaneous only at low temperatures. b. It is spontaneous only at high temperatures. c. It is spontaneous all the time. d. It is non-spontaneous.
Consider the oxidation of elemental cadmium (II) oxide. 2Cd(s)+O2 (g)--> 2CdO(s) Using the following thermochemical data, calculate the minimu temperature in degrees Celsius at which this reaction is spontaneous. Species delta Hf degrees (kJ/mol) S degrees (J/molxK) Cd(s) 0 51.8 O2 0 205.2 CdO(s) -258.4 54.8 Select the correct answer: a. 2594 degrees Celsius b. 2321 degrees Celsius c. 1.278 degrees Celsius d. -271.9 degrees Celsius e. -270.6 degrees Celsius
a. H₂O b. SH- c. S²- BH3 e. NH3 14. At what temperatures will a reaction be spontaneous if A,H=+117 kJ and A,S = -35 J/K? The reaction will be spontaneous at any temperature. b. The reaction will never be spontaneous. c. Temperatures between 12.7 K and 135 K d. All temperatures above 94.1 K e. All temperatures below 94.1 K
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A C observations This reaction is slower below 18. °C than above. This reaction is spontaneous only above 97. °C. This reaction is always spontaneous, but proceeds faster at temperatures above 72. °C. AH is AS is conclusions AH is AS is AH is AS is ✓ (pick one) positive negative unknown (pick one) (pick one) (pick one) (pick one)
The following reaction is endothermic. 2NH3(g) → N2(g) + 3H2(g) This means the reaction A. will be spontaneous at high temperatures. B. will be spontaneous at low temperatures. C. is not spontaneous at any temperature. D. is spontaneous at all temperatures.
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A B с observations Crystallization of a pure compound is spontaneous only below 23. °C. This reaction is spontaneous only above 31. °C but proceeds at a faster rate above 83. °C. The reverse of this reaction is always spontaneous but proceeds faster at temperatures above 108. °C. AH is AS is AH is AS is conclusions ΔΗ is AS is (pick one) (pick one) (pick one) (pick one) (pick one) (pick one) V