Which process is/are spontaneous?, I only, II only, II and III only, I and IV only, What is always positive when a spontaneous process occurs?, ∆H universe, ∆H surrounding, ∆S surrounding, ∆S universe, What will likely to happen to entropy when the reaction is spontaneous?, entropy increases, entropy decreases, entropy remains zero, entropy remains constant, Which statement BEST describes the second law of thermodynamics?, Processes that involve the transfer or conversion of heat energy are irreversible., The total quantity of energy in the universe stays the same., Energy cannot be created or destroyed., Energy moves toward destruction., The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time, and is constant if and only if, All the spontaneous processes result in decreased total entropy of a system., All the spontaneous processes result in increased total entropy of a system., Any isolated system degenerates into a more ordered state., Energy of a system is conserved., One application of the second law of thermodynamics is when we put an ice cube in a cup with water at room temperature. Which of the following will likely happen?, The water releases off heat and the ice cube melts. Hence, the entropy of water decreases, The water releases off heat and the ice cube melts. Hence, the entropy of water increases, The water absorbs heat and the ice cube melts. Hence, the entropy of water decreases. , The water absorbs heat and the ice cube melts. Hence, the entropy of water increases., Which of the following statements regarding the Gibbs free energy change for a reaction is FALSE?, The Gibbs free energy change is the proportion of the enthalpy change of a reaction that is used to increase the entropy., If the Gibbs free energy change for a reaction is negative, the reaction happens spontaneously, , The Gibbs free energy is represented by the symbol G., A reaction with a negative Gibbs free energy change of reaction is called an exergonic reaction., Calculate the enthalpy change, ∆H? , ∆H = 0, ∆H = +1.9 kJ, ∆H = =2.0 kJ, ∆H = -3.8 kJ, Determine the entropy change, ∆H?, ∆S = + 4.76 J/mol, ∆S = + 5.74 J/mol, ∆S = +6.72 J/mol, ∆S = + 11.48 J/mol, What is the Gibb's free energy, ∆G?, ∆G = -3.8 kJ, ∆G = + 5.74 J/mol, ∆G = -5.51 kJ, ∆G = + 6.72 kJ, Based on test item no. 10, Is the reaction spontaneous, nonspontaneous or at equilibrium?, Spontaneous, Nonspontaneous, At Equilibrium, Insufficient information, The Haber Process may be described by the equation: N2(g) + 3H2(g) = 2NH3(g) What is the equilibrium constant for this process?, , , , , A few drops of concentrated sulphuric acid were added to a mixture of 0.1 mol of methanol and 0.2 mol of ethanoic acid. Even after a considerable time, the reaction mixture was found to contain some of each reactant. Which of the following is the BEST explanation for the incomplete reaction?, The temperature was too low., Insufficient methanol was used., Insufficient ethanoic acid was used. , An equilibrium mixture was formed., The diagram on the right shows the concentrations of hydrogen, iodine and hydrogen iodide for the reaction between hydrogen and iodine. Which of the following statements is INCORRECT?, At point C, the system is in a state of dynamic equilibriann, The reaction between the gases reaches equilibrium at point C, Adding more hydrogen at point D will alter the shape of the graph., At point A on the time axis, the concentration of all three gases is zero, When is a system considered in a state of equilibrium?, The rate of the reverse reaction is insignificant compared to that of the forward reaction., The rates of the forward and reverse reactions are equal, The rate of reaction is negligible., All reaction stops.,  What is the CORRECT designation of the chemical equilibrium when a catalyst is used in a chemical reaction?, Equilibrium shifts to right, decrease in ∆H value., No change in equilibrium, increase in ∆H value. , No change in equilibrium, no change in ∆H., Equilibrium shifts to left, no change in ∆H, In a 1-Liter container, the amount of Hmole, the amount of 12 is 2 moles & the amount of HI is 2 moles at equilibrium. Below is the balanced chemical equation for this reaction: What is the K for this reaction?, 1.0, 0.5, 2.0, 1.33.

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