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 The reverse of this reaction is always spontaneous but proceeds faster at temperatures above 40. °C. This reaction is spontaneous only above 28. °C but proceeds at a slower rate below 72. °C. This reaction is exothermic and proceeds slower at temperatures below 42. °C. ΔΗ is AS is ΔΗ is AS is ΔΗ is AS is conclusions X (pick one) (pick one) (pick one) ✓ (pick one) (pick one) ✓ (pick one) ✓ Ś

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 The reverse of this reaction is always spontaneous but proceeds faster at temperatures above 40. °C. This reaction is spontaneous only above 28. °C but proceeds at a slower rate below 72. °C. This reaction is exothermic and proceeds slower at temperatures below 42. °C. ΔΗ is AS is ΔΗ is AS is ΔΗ is AS is conclusions X (pick one) (pick one) (pick one) ✓ (pick one) (pick one) ✓ (pick one) ✓ Ś

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...

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Try Again Your answer is incorrect. 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 reaction B: Your answer is incorrect. B с observations This reaction is always spontaneous, but proceeds faster at temperatures above 9. °C. This reaction is spontaneous except below -20. °℃ but proceeds at a slower rate below 73. °C. Crystallization of a pure compound is spontaneous only below - 16. °C. AH is AS is conclusions AH is AS is AH is AS is X negative ↑ positive ↑ positive î negative ↑ negative ↑ negative ↑ 5
Read the descriptions of physical or chemical changes in the table below. Then decide whether the change will be spontaneous, if you can. Change An exothermic chemical reaction between a solid and a liquid results in gaseous products. A solid precipitates from a solution, absorbing heat as it does so. A gas expands, absorbing heat from its surroundings. Is this change spontaneous? Yes. No. Can't decide with information given. Yes. No. O Can't decide with information given. Yes. No. Can't decide with information given. X
Sublimation is an example of a process for which a. ΔH is negative and ΔS is positive at all temperatures. b. ΔH, ΔS, and ΔG are positive at all temperatures. c. ΔH and ΔS are positive at all temperatures. d. ΔH is positive and ΔS is negative at all temperatures. e. ΔH, ΔS, and ΔG are negative 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 A.S. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction A B C observations The reverse of this reaction is always spontaneous but proceeds slower at temperatures below -26. °C. This reaction is spontaneous except above -42. °℃. This reaction is endothermic. AH is AS is conclusions AH is AS is AH is AS is X (pick one) (pick one) (pick one) (pick one) (pick one) (pick one)
For a particular reaction, AH is 20.1 kJ/mol and AS is 45.9 J/(mol-K). Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction (i.e., product favored)? The reaction is spontaneous (product favored) for temperatures O greater than O less than T = Chp
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
D Try Again Your answer is incorrect. 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 • reaction A: Your answer is incorrect. • reaction C: Your answer is incorrect. B с observations The reverse of this reaction is always spontaneous. This reaction is exothermic and proceeds slower at temperatures below -26. °C. This reaction is always spontaneous, but proceeds faster at temperatures above 139. °C. AH is AS is conclusions AH is As is AH is AS is X unknown negative ŷ negative ↑ unknown î unknown ↑ positive î S
1.) Complete A and B to move on. a.) Write the complete, balanced chemical equation for the following reaction on a separate sheet of paper. Provide products where they are not given. Assume that the reaction is spontaneous. Propane (C3H8) + oxygen → carbon dioxide + water Type the sum of the coefficients in the equation into the answer blank. If there is no coefficient, count it as one. Include ( g, s, l, or aq) b.) Write the complete, balanced chemical equation for the following reaction on a separate sheet of paper. Provide products where they are not given. Assume that the reaction is spontaneous. Diphosphorus pentoxide + water → Type in the coefficient and formula for the product in the equation that contains phosphorus. Include ( g, s, l, or aq)
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
Consider the two different systems, A and B, shown below. If there are 3 particles with a total energy of 12 J, which system would have more entropy and why? Question 21 options: System A has more entropy because it has greater separation between energy levels and hence more microstates than system B. System B has more entropy because it has more than two microstates, whereas System A only has two microstates possible. System A has more entropy because it has three microstates, whereas System B has less than three microstates possible. System B has more entropy because it has more than three microstates, whereas System A only has three microstates possible. System A has more entropy because it has more than one microstate, whereas System B only has one microstate possible.
From the values of ΔH and ΔS calculate the minimum temperature at which each reaction will become spontaneous. Enter "None" if the reaction is not spontaneous at any temperature. ΔH = -389 kJ/mol, ΔS = 27.8 J/K · mol
Read the descriptions of physical or chemical changes in the table below. Then decide whether the change will be spontaneous, if you can. Change During an endothermic chemical reaction, four moles of gaseous reactants are turned into two moles of gaseous products. A solid precipitates from a solution, releasing heat as it does so. A solid absorbs heat and turns to a gas. Is this change spontaneous? Yes. O No. O Can't decide with information given. O Yes. O No. O Can't decide with information given. O Yes. O No. O Can't decide with information given.