EBK WEBASSIGN FOR ZUMDAHL'S CHEMICAL PR
8th Edition
ISBN: 9780357119099
Author: ZUMDAHL
Publisher: VST
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Chapter 4, Problem 94AE
Suppose 50.0 mL of 0.250 M
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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 4 Solutions
EBK WEBASSIGN FOR ZUMDAHL'S CHEMICAL PR
Ch. 4 - Prob. 1DQCh. 4 - Prob. 2DQCh. 4 - Prob. 3DQCh. 4 - Prob. 4DQCh. 4 - Prob. 5DQCh. 4 - The exposed electrodes of a light bulb are placed...Ch. 4 - Prob. 7DQCh. 4 - Prob. 8DQCh. 4 - Consider separate aqueous solutions of HCland...Ch. 4 - Prob. 10DQ
Ch. 4 - Prob. 11DQCh. 4 - Characterize strong electrolytes versus weak...Ch. 4 - The figures below are molecular-level...Ch. 4 - Prob. 14ECh. 4 - Differentiate between what happens when the...Ch. 4 - Commercial cold packs and hot packs are available...Ch. 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 - A stock solution containing Mn2+ ions is prepared...Ch. 4 - Prob. 31ECh. 4 - Prob. 32ECh. 4 - List the formulas of three soluble bromide salts...Ch. 4 - Prob. 34ECh. 4 - Prob. 35ECh. 4 - Prob. 36ECh. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - Write the balanced molecular, complete, and net...Ch. 4 - How would you separate the following ions in...Ch. 4 - Prob. 41ECh. 4 - Prob. 42ECh. 4 - Prob. 43ECh. 4 - What volume of 0.100 M Na3PO4 is required to...Ch. 4 - Prob. 45ECh. 4 - Prob. 46ECh. 4 - Prob. 47ECh. 4 - The following drawings represent aqueous...Ch. 4 - Prob. 49ECh. 4 - Prob. 50ECh. 4 - Prob. 51ECh. 4 - Prob. 52ECh. 4 - Saccharin (C7H5NO3S) is sometimes dispensed in...Ch. 4 - Prob. 54ECh. 4 - A 1.42-g sample of a pure compound with formula...Ch. 4 - Prob. 56ECh. 4 - Prob. 57ECh. 4 - Prob. 58ECh. 4 - Prob. 59ECh. 4 - Prob. 60ECh. 4 - Prob. 61ECh. 4 - Prob. 62ECh. 4 - Prob. 63ECh. 4 - Sodium hydroxide solution is usually standardized...Ch. 4 - Prob. 65ECh. 4 - Prob. 66ECh. 4 - Prob. 67ECh. 4 - A student titrates an unknown amount of...Ch. 4 - Prob. 69ECh. 4 - Prob. 70ECh. 4 - Hydrochloric acid (75.0 mL of 0.250 M) is added...Ch. 4 - Prob. 72ECh. 4 - Prob. 73ECh. 4 - Prob. 74ECh. 4 - Prob. 75ECh. 4 - Prob. 76ECh. 4 - Prob. 77ECh. 4 - Prob. 78ECh. 4 - Prob. 79ECh. 4 - Balance each of the following oxidationreduction...Ch. 4 - Prob. 81ECh. 4 - Prob. 82ECh. 4 - Prob. 83ECh. 4 - Prob. 84ECh. 4 - Prob. 85ECh. 4 - Prob. 86ECh. 4 - Prob. 87ECh. 4 - Prob. 88ECh. 4 - Prob. 89ECh. 4 - Prob. 90ECh. 4 - Prob. 91AECh. 4 - Prob. 92AECh. 4 - Consider a 1.50-g mixture of magnesium nitrate...Ch. 4 - Suppose 50.0 mL of 0.250 M CoCl2 solution is added...Ch. 4 - Prob. 95AECh. 4 - A mixture contains only NaCland Fe(NO3)3 . A...Ch. 4 - A mixture contains only sodium chloride and...Ch. 4 - Prob. 98AECh. 4 - A student added 50.0 mL of an NaOH solution...Ch. 4 - In a 1-L beaker, 203 mL of 0.307 M ammonium...Ch. 4 - It took 25.060.05 mL of a sodium hydroxide...Ch. 4 - You wish to prepare 1 L of a 0.02 M potassium...Ch. 4 - Citric acid, which can be obtained from lemon...Ch. 4 - Acetylsalicylic acid is the active ingredient in...Ch. 4 - A 6.50-g sample of a diprotic acid requires 137.5...Ch. 4 - Prob. 106AECh. 4 - Chlorisondamine chloride (C14H20Cl6N2) is a drug...Ch. 4 - Calculate the concentration of all ions present...Ch. 4 - A solution is prepared by dissolving 0.6706 g...Ch. 4 - For the following chemical reactions, determine...Ch. 4 - What volume of 0.100 M NaOH is required to...Ch. 4 - Prob. 112AECh. 4 - A 450.0-mL sample of a 0.257-M solution of silver...Ch. 4 - Prob. 114AECh. 4 - A 50.00-mL sample of aqueous Ca(OH)2 requires34.66...Ch. 4 - When organic compounds containing sulfur are...Ch. 4 - Assign the oxidation state for the element listed...Ch. 4 - The blood alcohol (C2H5OH) level can be determined...Ch. 4 - Zinc and magnesium metal each react with...Ch. 4 - A 10.00-g sample consisting of a mixture of...Ch. 4 - Consider the reaction of 19.0 g of zinc with...Ch. 4 - Consider an experiment in which two burets, Y and...Ch. 4 - A sample is a mixture of KCl and KBr. When 0.1024...Ch. 4 - You made 100.0 mL of a lead(II) nitrate solution...Ch. 4 - Polychlorinated biphenyls (PCBs) have been used...Ch. 4 - Prob. 126CPCh. 4 - Prob. 127CPCh. 4 - Chromium has been investigated as a coating for...Ch. 4 - Prob. 129CPCh. 4 - Three students were asked to find the identity of...Ch. 4 - A sample is a mixture of AgNO3,CuCl2,andFeCl3...Ch. 4 - Prob. 132MPCh. 4 - You have two 500.0-mL aqueous solutions. Solution...
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- ion. 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_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 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_forward
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