Interpretation:
A student opens a stack of new playing cards and shuffles them. In the light of the quoted paragraph, have the cards increased in entropy? Explain your answer in terms of
Concept introduction:
Entropy is an amount of the inaccessible energy in a closed thermodynamic system which is also generally considered to be a measure of the disorder of the system, which is a property of the state of the system, and that changes precisely with any reversible change in heat in the system and inversely with the temperature of the system; broadly: the level of disorder or instability in a system.
Trending nowThis is a popular solution!
Chapter 10 Solutions
Chemistry for Engineering Students
- Coal is used as a fuel in some electric-generating plants. Coal is a complex material, but for simplicity we may consider it to be a form of carbon. The energy that can be derived from a fuel is sometimes compared with the enthalpy of the combustion reaction: C(s)+O2(g)CO2(g) Calculate the standard enthalpy change for this reaction at 25C. Actually, only a fraction of the heat from this reaction is available to produce electric energy. In electric generating plants, this reaction is used to generate heat for a steam engine, which turns the generator. Basically the steam engine is a type of heat engine in which steam enters the engine at high temperature (Th), work is done, and the steam then exits at a lower temperature (Tl). The maximum fraction, f, of heat available to produce useful energy depends on the difference between these temperatures (expressed in kelvins), f = (Th Tl)/Th. What is the maximum heat energy available for useful work from the combustion of 1.00 mol of C(s) to CO2(g)? (Assume the value of H calculated at 25C for the heat obtained in the generator.) It is possible to consider more efficient ways to obtain useful energy from a fuel. For example, methane can be burned in a fuel cell to generate electricity directly. The maximum useful energy obtained in these cases is the maximum work, which equals the free-energy change. Calculate the standard free-energy change for the combustion of 1.00 mol of C(s) to CO2(g). Compare this value with the maximum obtained with the heat engine described here.arrow_forwardDescribe the energy and entropy changes that occur in the following processes, and indicate whether the processes are spontaneous under the conditions stated: a.Lumber becomes a house b.A seed grows into a tree. c.On a hot day, water evaporates from a lake.arrow_forwardA pot of cold water is heated on a stove, and when the water boils, a fresh egg is placed in the water to cook. Describe the events that are occurring in terms of the zeroth law of thermodynamics.arrow_forward
- Define the term entropy, and give an example of a sample of matter that has zero entropy. What are the units of entropy? How do they differ from the units of enthalpy?arrow_forwardWhich of the following processes will lead to a decrease in the internal energy of a system? (1) Energy is transferred as heat to the system; (2) energy is transferred as heat from the system; (3) energy is transferred as work done on the system; or (4) energy is transferred as work done by the system. (a) 1 and 3 (b) 2 and 4 (c) 1 and 4 (d) 2and3arrow_forwardThermodynamics provides a way to interpret everyday occurrences. If you live in northern climates, one common experience is that during early winter, snow falls but then melts when it hits the ground. Both the formation and the melting happen spontaneously. How can thermodynamics explain both of these seemingly opposed events?arrow_forward
- Calculate H for each of the following reactions using the data in Appendix 4: 4Na(s)+O2(g)2Na2O(s)2Na(s)+2H2O(l)2NaOH(aq)+H2(g)2Na(s)+CO2(g)Na2O(s)+CO(g) Explain why a water or carbon dioxide fire extinguisher might not be effective in putting out a sodium fire.arrow_forwardA beaker of water at 40C (on the left in the drawing) and a beaker of ice water at 0°C are placed side by side in an insulated container. After some time has passed, the temperature of the water in the beaker on the left is 30°C and the temperature of the ice water is still 0°C. Describe what is happening in each beaker (a) on the molecular level and (b) in terms of the second law of thermodynamicsarrow_forwardFor each process, tell whether the entropy change of the system is positive or negative. (a) A glassblower heats glass (the system) to its softening temperature. (b) A teaspoon of sugar dissolves in a cup of coffee. (The system consists of both sugar and coffee.) (c) Calcium carbonate precipitates out of water in a cave to form stalactites and stalagmites. (Consider only the calcium carbonate to be the system.)arrow_forward
- For each process, tell whether the entropy change of the system is positive or negative. Water vapor (the system) deposits as ice crystals on a cold windowpane. A can of carbonated beverage loses its fizz. (Consider the beverage but not the can as the system. What happens to the entropy of the dissolved gas?) A glassblower heats glass (the system) to its softening temperature.arrow_forwardAcetic acid, a weak acid, was added to a beaker containing water at 25 C, giving a solution containing molecular acetic acid, hydronium ion, and acetate ion at equilibrium. The temperature did not change. (a) Is the solution process exothermic or endothermic? (b) Was the dissolving process and partial ionization spontaneous? (c) Did the entropy of the system increase or decrease? (d) Did the entropy of the universe increase or decrease?arrow_forwardExplain in your own words what is meant by the term entropy. Explain how both matter spread and energy spread are related to the concept of entropy.arrow_forward
- Chemistry for Engineering StudentsChemistryISBN:9781285199023Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningIntroductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage Learning
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningWorld of Chemistry, 3rd editionChemistryISBN:9781133109655Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCostePublisher:Brooks / Cole / Cengage Learning