Study Guide for Chemistry: The Central Science
13th Edition
ISBN: 9780321949288
Author: Theodore E. Brown, James C. Hill
Publisher: PEARSON
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Chapter 4, Problem 77E
As shown here, one type of computer keyboard cleaner contains liquefied 1, 1-difluoroethane (C2H4F2), which is a gas at atmospheric pressure. When the nozzle is squeezed, the 1, 1-difluroenthane vaporizes out of the nozzle at high pressure, blowing dust out objects.
- Based on your experience, is the vaporization a spontaneous process at room temperature?
- Defining the 1.1-difluoroethane as the system, do you expect qsys for the process to be positive or negative
- Predict whether ΔS is positive or negative for this process.
- Given your answer to (a), (b), and (c), do you think the operation of this product depends more on enthalpy or entropy? [Sections 19.1 and 19.2]
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Chapter 4 Solutions
Study Guide for Chemistry: The Central Science
Ch. 4.1 - Prob. 4.1.1PECh. 4.1 - How are the boundaries between the regions of the...Ch. 4.2 - Air pollution in the Mexico City metropolitan area...Ch. 4.2 - Prob. 4.2.2PECh. 4.2 - Prob. 4.3.1PECh. 4.2 - Prob. 4.3.2PECh. 4.2 - Prob. 4.4.1PECh. 4.2 - Prob. 4.4.2PECh. 4.3 - Distinguish between photodissociation and...Ch. 4.3 - Prob. 4.5.2PE
Ch. 4.3 - Prob. 4.6.1PECh. 4.3 - Prob. 4.6.2PECh. 4.3 - Do the reactions involved in ozone depletion...Ch. 4.3 - Prob. 4.7.2PECh. 4.4 - Prob. 4.8.1PECh. 4.4 - Prob. 4.8.2PECh. 4.4 - Prob. 4.9.1PECh. 4.4 - Prob. 4.9.2PECh. 4.4 - Prob. 4.10.1PECh. 4.4 - Prob. 4.10.2PECh. 4.5 - Practice Exercise 2 The bond energy in N2 is 941...Ch. 4.5 - Prob. 4.11.2PECh. 4.5 - Prob. 4.12.1PECh. 4.5 - Prob. 4.12.2PECh. 4.5 - Prob. 4.13.1PECh. 4.5 - Prob. 4.13.2PECh. 4.5 - The figure shows the three lowest regions of...Ch. 4.5 - Prob. 4.14.2PECh. 4.6 - Where does the energy come from to evaporate the...Ch. 4.6 - Prob. 4.15.2PECh. 4.6 - Prob. 4.16.1PECh. 4.6 - The first stage of treatment at the reverse...Ch. 4.6 - Prob. 4.17.1PECh. 4.6 - Prob. 4.17.2PECh. 4 - Prob. 1DECh. 4 - Prob. 1ECh. 4 - Prob. 2ECh. 4 - Prob. 3ECh. 4 - Prob. 4ECh. 4 - Prob. 5ECh. 4 - Prob. 6ECh. 4 - Which of the following ions will always be a...Ch. 4 - Prob. 8ECh. 4 - Prob. 9ECh. 4 - Prob. 10ECh. 4 - Prob. 11ECh. 4 - List the common products formed when an organic...Ch. 4 - Prob. 13ECh. 4 - Prob. 14ECh. 4 - Prob. 15ECh. 4 - Prob. 16ECh. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Prob. 19ECh. 4 - Prob. 20ECh. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - Prob. 25ECh. 4 - Prob. 26ECh. 4 - Prob. 27ECh. 4 - Prob. 28ECh. 4 - Prob. 29ECh. 4 - Explain, using Le Châtelier’s principle, why the...Ch. 4 - Prob. 31ECh. 4 - Prob. 32ECh. 4 - Prob. 33ECh. 4 - Prob. 34ECh. 4 - Prob. 35ECh. 4 - Prob. 36ECh. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - Prob. 39ECh. 4 - Prob. 40ECh. 4 - Prob. 41ECh. 4 - Prob. 42ECh. 4 - Prob. 43ECh. 4 - Prob. 44ECh. 4 - Prob. 45ECh. 4 - 18.85 The main reason that distillation is a...Ch. 4 - Prob. 47ECh. 4 - Prob. 48ECh. 4 - Prob. 49ECh. 4 - Prob. 50ECh. 4 - Prob. 51ECh. 4 - Prob. 52ECh. 4 - The process of iron being oxidized to make iron...Ch. 4 - At 1 atm pressure, CO2(s) sublimes at 78oC. Is...Ch. 4 - Prob. 55ECh. 4 - Prob. 56ECh. 4 - Prob. 57ECh. 4 - Prob. 58ECh. 4 - Prob. 59ECh. 4 - Prob. 60ECh. 4 - Using the standard molar entropies in Appendix C,...Ch. 4 - Which of these statements is true? All spontaneous...Ch. 4 - Prob. 63ECh. 4 - Prob. 64ECh. 4 - Prob. 65ECh. 4 - Prob. 66ECh. 4 - Prob. 67ECh. 4 - What is the temperature above which the Haber...Ch. 4 - Prob. 69ECh. 4 - Prob. 70ECh. 4 - Prob. 71ECh. 4 - Prob. 72ECh. 4 - Prob. 73ECh. 4 - Prob. 74ECh. 4 - Prob. 75ECh. 4 - Prob. 76ECh. 4 - As shown here, one type of computer keyboard...Ch. 4 - 19.3
a. What are the signs of ΔS and ΔH for the...Ch. 4 - Predict the signs of H and S for this reaction....Ch. 4 - Prob. 80ECh. 4 - The accompanying diagram shows how H (red line)...Ch. 4 - Prob. 82ECh. 4 - Prob. 83ECh. 4 - Prob. 84ECh. 4 - Prob. 85ECh. 4 - Prob. 86ECh. 4 - Prob. 87ECh. 4 - Can endothermic chemical reaction be spontaneous?...Ch. 4 - Prob. 89ECh. 4 - Prob. 90ECh. 4 - Prob. 91AECh. 4 - Prob. 92AECh. 4 - Prob. 93AECh. 4 - Prob. 94AECh. 4 - Prob. 95AECh. 4 - Prob. 96AECh. 4 - Prob. 97AECh. 4 - Prob. 98AECh. 4 - Prob. 99AECh. 4 - Prob. 100AECh. 4 - Prob. 101AECh. 4 - Prob. 102AECh. 4 - Prob. 103AECh. 4 - Alcohol-based fuels for automobiles lead to the...Ch. 4 - Prob. 105IECh. 4 - Prob. 106IECh. 4 - Prob. 107IECh. 4 - Prob. 108IECh. 4 - Prob. 109IECh. 4 - Prob. 110IECh. 4 - Prob. 111IECh. 4 - Prob. 112IECh. 4 - Although there are many ions in seawater, the...Ch. 4 - The Ogallala aquifer described in the Close Look...Ch. 4 - Prob. 115IE
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- Indicate whether the following processes are spontaneous or nonspontaneous. (a) Liquid water freezing at a temperature below its freezing point (b) Liquid water freezing at a temperature above its freezing point (c) The combustion of gasoline (d) A ball thrown into the air (e) A raindrop falling to the ground (f) Iron rusting in a moist atmospherearrow_forwardDefine the following: a. spontaneous process b. entropy c. positional probability d. system e. surroundings f. universearrow_forwardSolid NH4NO3 is placed in a beaker containing water at 25 C. When the solid has completely dissolved, the temperature of the solution is 23.5 C. (a) Was the process exothermic or endothermic? (b) Was the process spontaneous? (c) Did the entropy of the system increase? (d) Did the entropy of the universe increase?arrow_forward
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