Chemistry: A Molecular Approach
3rd Edition
ISBN: 9780321809247
Author: Nivaldo J. Tro
Publisher: Prentice Hall
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Chapter 4, Problem 6E
Interpretation Introduction
Interpretation: The difference between a strong electrolyte, a weak electrolyte, and a nonelectrolyte is to be explained.
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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
Try Again
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•
Chapter 4 Solutions
Chemistry: A Molecular Approach
Ch. 4 - Prob. 1SAQCh. 4 - Q2. Sodium and chlorine react to form sodium...Ch. 4 - Prob. 3SAQCh. 4 - Prob. 4SAQCh. 4 - Prob. 5SAQCh. 4 - Prob. 6SAQCh. 4 - Prob. 7SAQCh. 4 - Prob. 8SAQCh. 4 - Prob. 9SAQCh. 4 - Q10. What is the net ionic equation for the...
Ch. 4 - Q11. What is the net ionic equation for the...Ch. 4 - Q12. What is the net ionic equation for the...Ch. 4 - Prob. 13SAQCh. 4 - Prob. 14SAQCh. 4 - Prob. 15SAQCh. 4 - 1. What is reaction stoichiometry? What is the...Ch. 4 - Prob. 2ECh. 4 - Prob. 3ECh. 4 - Prob. 4ECh. 4 - 5. What is molarity? How is it useful?
Ch. 4 - 6. Explain how a strong electrolyte, a weak...Ch. 4 - 7. Explain the difference between a strong acid...Ch. 4 - Prob. 8ECh. 4 - Prob. 9ECh. 4 - Prob. 10ECh. 4 - Prob. 11ECh. 4 - Prob. 12ECh. 4 - Prob. 13ECh. 4 - Prob. 14ECh. 4 - 15. What is an acid–base reaction? Give an...Ch. 4 - 16. Explain the principles behind an acid–base...Ch. 4 - 17. What is a gas-evolution reaction? Give an...Ch. 4 - 18. What reactant types give rise to gas-evolution...Ch. 4 - Prob. 19ECh. 4 - Prob. 20ECh. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - 23. In a redox reaction, which reactant is the...Ch. 4 - Prob. 24ECh. 4 - Prob. 25ECh. 4 - Prob. 26ECh. 4 - 27. Calculate how many moles of NO2 form when each...Ch. 4 - 28. Calculate how many moles of NH3 form when each...Ch. 4 - Prob. 29ECh. 4 - Prob. 30ECh. 4 - Prob. 31ECh. 4 - Prob. 32ECh. 4 - 33. For each of the reactions, calculate the mass...Ch. 4 - 34. For each of the reactions, calculate the mass...Ch. 4 - 35. For each of the acid–base reactions, calculate...Ch. 4 - Prob. 36ECh. 4 - 37. Find theFor the following reaction, determine ...Ch. 4 - 38. Find the limiting reactant for each initial...Ch. 4 - Prob. 39ECh. 4 - Prob. 40ECh. 4 - Prob. 41ECh. 4 - 42. Calculate the theoretical yield of product (in...Ch. 4 - Zinc sulfide reacts with oxygen according to the...Ch. 4 - 44. Iron(II) sulfide reacts with hydrochloric acid...Ch. 4 - Prob. 45ECh. 4 - Prob. 46ECh. 4 - 47. Iron(III) oxide reacts with carbon monoxide...Ch. 4 - 48. Elemental phosphorus reacts with chlorine gas...Ch. 4 - 49. Lead ions can be precipitated from solution...Ch. 4 - Prob. 50ECh. 4 - Prob. 51ECh. 4 - Prob. 52ECh. 4 - 53. Calculate the molarity of each solution.
a....Ch. 4 - Prob. 54ECh. 4 - 55. What is the molarity of NO3– in each...Ch. 4 - Prob. 56ECh. 4 - Prob. 57ECh. 4 - 58. What volume of 0.200 M ethanol solution...Ch. 4 - Prob. 59ECh. 4 - Prob. 60ECh. 4 - 61. If 123 mL of a 1.1 M glucose solution is...Ch. 4 - 62. If 3.5 L of a 4.8 M SrCl2 solution is diluted...Ch. 4 - 63. To what volume should you dilute 50.0 mL of a...Ch. 4 - 64. To what volume should you dilute 25 mL of a...Ch. 4 - Prob. 65ECh. 4 - 66. Consider the reaction:
Li2S(aq) + Co(NO3)2(aq)...Ch. 4 - 67. What is the minimum amount of 6.0 M H2SO4...Ch. 4 - Prob. 68ECh. 4 - 69. A 25.0-mL sample of a 1.20 M potassium...Ch. 4 - Prob. 70ECh. 4 - Prob. 71ECh. 4 - Prob. 72ECh. 4 - Prob. 73ECh. 4 - Prob. 74ECh. 4 - Prob. 75ECh. 4 - 76. Complete and balance each equation. If no...Ch. 4 - Write a molecular equation for the precipitation...Ch. 4 - 78. Write a molecular equation for the...Ch. 4 - Prob. 79ECh. 4 - 80. Write balanced complete ionic and net ionic...Ch. 4 - Prob. 81ECh. 4 - Prob. 82ECh. 4 - 83. Write balanced molecular and net ionic...Ch. 4 - Prob. 84ECh. 4 - Prob. 85ECh. 4 - Prob. 86ECh. 4 - Prob. 87ECh. 4 - 90. A 30.00-mL sample of an unknown H3PO4 solution...Ch. 4 - Prob. 89ECh. 4 - Prob. 90ECh. 4 - Prob. 91ECh. 4 - Prob. 92ECh. 4 - Prob. 93ECh. 4 - Prob. 94ECh. 4 - Prob. 95ECh. 4 - Prob. 96ECh. 4 - Prob. 97ECh. 4 - Prob. 98ECh. 4 - Prob. 99ECh. 4 - Prob. 100ECh. 4 - 103. People sometimes use sodium bicarbonate as an...Ch. 4 - 104. Toilet bowl cleaners often contain...Ch. 4 - Prob. 103ECh. 4 - Many home barbeques are fueled with propane gas...Ch. 4 - Prob. 105ECh. 4 - Prob. 106ECh. 4 - Prob. 107ECh. 4 - 110. A hydrochloric acid solution will neutralize...Ch. 4 - 111. Predict the products and write a balanced...Ch. 4 - 112. Predict the products and write a balanced...Ch. 4 - Prob. 111ECh. 4 - Prob. 112ECh. 4 - Prob. 113ECh. 4 - Prob. 114ECh. 4 - 117. The nitrogen in sodium nitrate and in...Ch. 4 - 118. Find the volume of 0.110 M hydrochloric acid...Ch. 4 - Prob. 117ECh. 4 - 120. We prepare a solution by mixing 0.10 L of...Ch. 4 - Prob. 119ECh. 4 - Prob. 120ECh. 4 - Prob. 121ECh. 4 - 124. An important reaction that takes place in a...Ch. 4 - 125. A liquid fuel mixture contains 30.35% hexane...Ch. 4 - 126. Titanium occurs in the magnetic mineral...Ch. 4 - Prob. 125ECh. 4 - Prob. 126ECh. 4 - Prob. 127ECh. 4 - Prob. 128ECh. 4 - 131. Recall from Section 4.6 that sodium carbonate...Ch. 4 - 132. Lead poisoning is a serious condition...Ch. 4 - Prob. 131ECh. 4 - Prob. 132ECh. 4 - Prob. 133ECh. 4 - Prob. 134ECh. 4 - Prob. 135ECh. 4 - Prob. 136ECh. 4 - Prob. 137ECh. 4 - Consider the generic ionic compounds with the...
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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 The reverse of this reaction is always spontaneous but proceeds faster at temperatures above -48. °C. ΔΗ is (pick one) ✓ AS is (pick one) B This reaction is spontaneous except below 114. °C but proceeds at a slower rate below 135. °C. ΔΗ is (pick one) AS is (pick one) ΔΗ is C This reaction is exothermic and proceeds faster at temperatures above -43. °C. (pick one) AS is (pick one) v Х 5 ? 18 Ararrow_forwardion. A student proposes the following Lewis structure for the perchlorate (CIO) io : :0: : Cl : - - : :0: ك Assign a formal charge to each atom in the student's Lewis structure. atom central O formal charge ☐ top O ☐ right O ☐ bottom O ☐ Cl ☐arrow_forwardDecide whether these proposed Lewis structures are reasonable. proposed Lewis structure Yes. Is the proposed Lewis structure reasonable? Cl- : 2: :Z: :Z: N—N : 0: C C1: O CO No, it has the wrong number of valence electrons. The correct number is: ☐ No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* ☐ Yes. No, it has the wrong number of valence electrons. The correct number is: ☐ No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* | Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* | If two or more atoms of the same element don't satisfy the octet rule, just enter the chemical symbol as many times as necessary. For example, if two oxygen atoms don't satisfy the octet rule, enter "0,0". ☑arrow_forward
- 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 ΔΗ is (pick one) A This reaction is faster above 103. °C than below. AS is (pick one) ΔΗ is (pick one) B This reaction is spontaneous only above -9. °C. AS is (pick one) ΔΗ is (pick one) C The reverse of this reaction is always spontaneous. AS is (pick one) 18 Ararrow_forwardUse 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 The reverse of this reaction is always spontaneous but proceeds slower at temperatures below 41. °C. ΔΗ is (pick one) AS is (pick one) ΔΗ is (pick one) B This reaction is spontaneous except above 94. °C. AS is (pick one) This reaction is always spontaneous, but ΔΗ is (pick one) C proceeds slower at temperatures below −14. °C. AS is (pick one) Х 00. 18 Ar 무ㅎ B 1 1arrow_forwardDraw the product of the reaction shown below. Ignore inorganic byproducts. + H CH3CH2OH HCI Drawingarrow_forward
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Solutions: Crash Course Chemistry #27; Author: Crash Course;https://www.youtube.com/watch?v=9h2f1Bjr0p4;License: Standard YouTube License, CC-BY