Quiz on Thermodynamics Quiz on Thermodynamics Spontaneity Equilibrium Introduction to Equilibrium Thermodynamics and Spontaneity 1. Which process is accompanied by a decrease in entropy of the materials? Expansion of a gas into a vacuum Solution formation Crystal formation Thermal equalization between two regions in thermal contact Diffusion of solute molecules into a region of low solute concentration 2. Identify the INCORRECT statement below The symbol H refers to the enthalpy, or “heat content” of the system. The ΔH of a reaction tells one the heat liberated or absorbed under constant pressure reaction conditions. The internal energy change of a system equals the heat absorbed minus the work done by the system. The second law states that ΔS of a system increases in any spontaneous process. The symbol G refers to the Gibbs’ free energy of the system. 3. Which response includes all the following processes that are accompanied by an INCREASE in entropy, and only those processes? I. boiling water II. freezing water III. N2(g) + 3 H2(g) → 2 NH3(g) IV. Br2(l) → Br2(g) I and II III and IV I and IV II, III, and IV Another one or another combination 4. Use the data in the table to calculate the ΔGo of the following reaction at 298 K: Al2O3(s) + 6 HCl(aq) → 2 AlCl3(s) + 3 H2O(l) SPECIES ΔH°f at 298 K (kJ/mol) ΔG°f at 298 K (kJ/mol) Al2O3(s) -1675.7 -1582.3 HCl(aq) -167.16 -131.2 AlCl3(s) -704.2 -628.8 H2O(l) -285.8 -237.1 -1593 kJ/mol +121.7 kJ/mol -121.7 kJ/mol +400.6 kJ/mol +412.8 kJ/mol 5. There are two properties of a reacting system that determine whether a process at constant pressure and temperature can occur spontaneously. These are Kinetic and potential energy change Heat and work Energy change and enthalpy change Enthalpy change and entropy change Loading … Question 1 of 5 Thermodynamics Video Lessons Video lessons and quizzes Share this:TweetWhatsAppLike this:Like Loading...
