19. Chemical Thermodynamics

At what temperature does the following reaction become nonspontaneous?

2 NO (g) + O₂ (g) → 2 NO₂ (g)

The reaction between carbon tetrachloride (CCl4) and water (H2O) to form carbon dioxide (CO2) and hydrogen chloride (HCl) has a ΔG° value of -232 kJ/mole, indicating it is thermodynamically favored. However, when you mix carbon tetrachloride with water, what occurs?

Which of the following processes is considered energetically unfavorable?

Which of the following would have a negative ΔS?

For a reaction to be spontaneous at all temperatures, the signs of ΔH and ΔS must be:

The process of iron being oxidized to make iron(III) oxide (rust) is spontaneous. Which of these statements about this process is true?

A process is always spontaneous under which conditions?

Which of the following is (are) spontaneous processes?

(i)a ball rolling down a hill
(ii)a car rusting
(iii)the decomposition of water into H₂ gas and O₂ gas

The following reaction is spontaneous at room temperature: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g). Which of the following is true about the enthalpy (ΔH) and entropy (ΔS) changes for this reaction?

Which of the following statements is true regarding the relationship between spontaneity and reaction rate?

Which of the following pairs of reactants will result in a spontaneous redox reaction at 25°C?

A reaction that is spontaneous as written

Calculate ΔS_surr (in units of J/K) for the process in which 2.00 mol of water are placed into a freezer at −10.0℃.