Masteringchemistry With Pearson Etext -- Valuepack Access Card -- For Principles Of Chemistry: A Molecular Approach
3rd Edition
ISBN: 9780133890686
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Chapter 6, Problem 12E
Interpretation Introduction
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Using the conditions of spontaneity to deduce the signs of AH and AS
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
This reaction is always spontaneous, but
proceeds slower at temperatures above
120. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
117. °C.
AS is
(pick one)
ΔΗ is
(pick one)
This reaction is slower below 20. °C than
C
above.
AS is
|(pick one)
?
18
Ar
1
Calculating the pH at equivalence of a titration
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Your answer is incorrect.
0/5
a
A chemist titrates 70.0 mL of a 0.7089 M hydrocyanic acid (HCN) solution with 0.4574M KOH solution at 25 °C. Calculate the pH at equivalence. The pK of
hydrocyanic acid is 9.21.
Round your answer to 2 decimal places.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of KOH solution added.
pH
=
11.43]
G
00.
18
Ar
B•
Biological Macromolecules
Naming and drawing the products of aldose oxidation and reduction
aw a Fischer projection of the molecule that would produce L-ribonic acid if it were subjected to mildly oxidizing reaction conditions.
Click and drag to start drawing a
structure.
X
AP
‡
1/5
Naor
Explanation
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Chapter 6 Solutions
Masteringchemistry With Pearson Etext -- Valuepack Access Card -- For Principles Of Chemistry: A Molecular Approach
Ch. 6 - Prob. 1SAQCh. 6 - Q2. Which sample is most likely to undergo the...Ch. 6 - Prob. 3SAQCh. 6 - Q4. A 12.5-g sample of granite initially at 82.0...Ch. 6 - Q5. A cylinder with a moving piston expands from...Ch. 6 - Q6. When a 3.80-g sample of liquid octane (C8H18)...Ch. 6 - Q7. Hydrogen gas reacts with oxygen to form...Ch. 6 - Prob. 8SAQCh. 6 - Prob. 9SAQCh. 6 - Prob. 10SAQ
Ch. 6 - Prob. 11SAQCh. 6 - Prob. 12SAQCh. 6 - Prob. 13SAQCh. 6 - Prob. 14SAQCh. 6 - Q15. Natural gas burns in air to form carbon...Ch. 6 - 1. What is thermochemistry? Why is it important?
Ch. 6 - 2. What is energy? What is work? List some...Ch. 6 - Prob. 3ECh. 6 - 4. State the law of conservation of energy. How...Ch. 6 - Prob. 5ECh. 6 - 6. State the first law of thermodynamics. What are...Ch. 6 - Prob. 7ECh. 6 - 8. What is a state function? List some examples of...Ch. 6 - 9. What is internal energy? Is internal energy a...Ch. 6 - 10. If energy flows out of a chemical system and...Ch. 6 - 11. If the internal energy of the products of a...Ch. 6 - 12. What is heat? Explain the difference between...Ch. 6 - 13. How is the change in internal energy of a...Ch. 6 - 14. Explain how the sum of heat and work can be a...Ch. 6 - 15. What is heat capacity? Explain the difference...Ch. 6 - 16. Explain how the high specific heat capacity of...Ch. 6 - 17. If two objects, A and B, of different...Ch. 6 - 18. What is pressure–volume work? How is it...Ch. 6 - 19. What is calorimetry? Explain the difference...Ch. 6 - 20. What is the change in enthalpy (ΔH) for a...Ch. 6 - 21. Explain the difference between an exothermic...Ch. 6 - 22. From a molecular viewpoint, where does the...Ch. 6 - 23. From a molecular viewpoint, where does the...Ch. 6 - 24. Is the change in enthalpy for a reaction an...Ch. 6 - Prob. 25ECh. 6 - Prob. 26ECh. 6 - 27. What is a standard state? What is the standard...Ch. 6 - Prob. 28ECh. 6 - How do you calculate Hrxno from tabulated standard...Ch. 6 - Prob. 30ECh. 6 - 31. What are the main environmental problems...Ch. 6 - Prob. 32ECh. 6 - Prob. 33ECh. 6 - Prob. 34ECh. 6 - Prob. 35ECh. 6 - 36. A particular frost-free refrigerator uses...Ch. 6 - 37. Which statement is true of the internal energy...Ch. 6 - Prob. 38ECh. 6 - 39. Identify each energy exchange as primarily...Ch. 6 - 40. Identify each energy exchange as primarily...Ch. 6 - 41. A system releases 622 kJ of heat and does 105...Ch. 6 - 42. A system absorbs 196 kJ of heat and the...Ch. 6 - 43. The gas in a piston (defined as the system)...Ch. 6 - Prob. 44ECh. 6 - Prob. 45ECh. 6 - Prob. 46ECh. 6 - 47. How much heat is required to warm 1.50 L of...Ch. 6 - 48. How much heat is required to warm 1.50 kg of...Ch. 6 - 49. Suppose that 25 g of each substance is...Ch. 6 - 50. An unknown mass of each substance, initially...Ch. 6 - 51. How much work (in J) is required to expand the...Ch. 6 - Prob. 52ECh. 6 - 53. The air within a piston equipped with a...Ch. 6 - 54. A gas is compressed from an initial volume of...Ch. 6 - 55. When 1 mol of a fuel burns at constant...Ch. 6 - 56. The change in internal energy for the...Ch. 6 - 57. Determine whether each process is exothermic...Ch. 6 - 58. Determine whether each process is exothermic...Ch. 6 - 59. Consider the thermochemical equation for the...Ch. 6 - 60. What mass of natural gas (CH4) must burn to...Ch. 6 - Prob. 61ECh. 6 - Prob. 62ECh. 6 - 63. The propane fuel (C3H8) used in gas barbeques...Ch. 6 - Prob. 64ECh. 6 - 65. A silver block, initially at 58.5 °C, is...Ch. 6 - Prob. 66ECh. 6 - 67. A 31.1-g wafer of pure gold, initially at 69.3...Ch. 6 - Prob. 68ECh. 6 - Prob. 69ECh. 6 - 70. A 2.74-g sample of a substance suspected of...Ch. 6 - 71. Exactly 1.5 g of a fuel burns under conditions...Ch. 6 - 72. In order to obtain the largest possible amount...Ch. 6 - 73. When 0.514 g of biphenyl (C12H10) undergoes...Ch. 6 - Prob. 74ECh. 6 - 75. Zinc metal reacts with hydrochloric acid...Ch. 6 - Prob. 76ECh. 6 - Prob. 77ECh. 6 - Prob. 78ECh. 6 - 79. Calculate ΔHrxn for the reaction:
Fe2O3(s) + 3...Ch. 6 - 80. Calculate ΔHrxn for the reaction:
CaO(s) +...Ch. 6 - 81. Calculate ΔHrxn for the reaction:
5 C(s) + 6...Ch. 6 - 82. Calculate ΔHrxn for the reaction:
CH4(g) + 4...Ch. 6 - 83. Write an equation for the formation of each...Ch. 6 - Prob. 84ECh. 6 - 85. Hydrazine (N2H4) is a fuel used by some...Ch. 6 - Prob. 86ECh. 6 - Prob. 87ECh. 6 - Prob. 88ECh. 6 - 89. During photosynthesis, plants use energy from...Ch. 6 - Prob. 90ECh. 6 - 91. Top fuel dragsters and funny cars burn...Ch. 6 - 92. The explosive nitroglycerin (C3H5N3O9)...Ch. 6 - 93. Determine the mass of CO2 produced by burning...Ch. 6 - Prob. 94ECh. 6 - Prob. 95ECh. 6 - Prob. 96ECh. 6 - Prob. 97ECh. 6 - Prob. 98ECh. 6 - 99. Evaporating sweat cools the body because...Ch. 6 - Prob. 100ECh. 6 - 101. Use standard enthalpies of formation to...Ch. 6 - 102. Dry ice is solid carbon dioxide. Instead of...Ch. 6 - 103. A 25.5-g aluminum block is warmed to 65.4 °C...Ch. 6 - Prob. 104ECh. 6 - Prob. 105ECh. 6 - Prob. 106ECh. 6 - 107. Derive a relationship between ΔH and ΔE for a...Ch. 6 - Prob. 108ECh. 6 - Prob. 109ECh. 6 - Prob. 110ECh. 6 - Prob. 111ECh. 6 - 112. When 10.00 g of phosphorus is burned in O2(g)...Ch. 6 - 113. The ?H for the oxidation of sulfur in the gas...Ch. 6 - 114. The of TiI3(s) is –328 kJ/mol and the ΔH°...Ch. 6 - Prob. 115ECh. 6 - Prob. 116ECh. 6 - Prob. 117ECh. 6 - 118. A pure gold ring and a pure silver ring have...Ch. 6 - Prob. 119ECh. 6 - Prob. 120ECh. 6 - Prob. 121ECh. 6 - Prob. 122ECh. 6 - Prob. 123ECh. 6 - Prob. 124ECh. 6 - Prob. 125ECh. 6 - Prob. 126ECh. 6 - Prob. 127ECh. 6 - Prob. 128ECh. 6 - Prob. 129ECh. 6 - Prob. 130ECh. 6 - 131. Which statement is true of the internal...Ch. 6 - Prob. 132ECh. 6 - 133. Which expression describes the heat evolved...Ch. 6 - Prob. 134ECh. 6 - 135. A 1-kg cylinder of aluminum and 1-kg jug of...Ch. 6 - Prob. 136ECh. 6 - 137. When 1 mol of a gas burns at constant...Ch. 6 - Prob. 138ECh. 6 - Prob. 139E
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