CHEMISTRY-MOD.MASTERING (18W)
8th Edition
ISBN: 9780136780922
Author: Robinson
Publisher: PEARSON
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Chapter 7, Problem 7.5P
Select the correct electron-dot structure for
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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•
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 7 Solutions
CHEMISTRY-MOD.MASTERING (18W)
Ch. 7 - Use the electro negativity values in Figure 7.4...Ch. 7 - Conceptual APPLY 7.2 An electrostatic potential...Ch. 7 - The dipole moment of AgCI in the gas phaseis...Ch. 7 - Predict which bond has greater percent ionic...Ch. 7 - Select the correct electron-dot structure for H2S...Ch. 7 - Use the octet rule to predict the molecular...Ch. 7 - Identify the correct electron-dot structure for...Ch. 7 - Draw an electron-dot structure for each of the...Ch. 7 - Select the correct electron-dot structure for...Ch. 7 - Identify the correct electron-dot structure(s) for...
Ch. 7 - Prob. 7.11PCh. 7 - Which oxygen species do you predict to be most...Ch. 7 - Draw an electron-dot structure for the following...Ch. 7 - There are two molecules with the formula C2H6O...Ch. 7 - The following structure is a representation of...Ch. 7 - Draw two possible electron-dot structures for the...Ch. 7 - Called “laughing gas, nitrous oxide (N2O) is...Ch. 7 - Draw as many resonance structures as possible for...Ch. 7 - Prob. 7.19PCh. 7 - Prob. 7.20ACh. 7 - Calculate the formal charge on each atom in the...Ch. 7 - Start with the electron-dot structure for the...Ch. 7 - Calculate formal charges on the C and O atoms in...Ch. 7 - Three resonance structures for anisole (Problem...Ch. 7 - The toxicity of the organophosphate insecticides...Ch. 7 - Prob. 7.26PCh. 7 - Prob. 7.27PCh. 7 - The following structure is a representation of the...Ch. 7 - The electron-dot structure for the nerve a gentsar...Ch. 7 - Draw the new electron-dot structures indicated by...Ch. 7 - The following diagram shows the potential energy...Ch. 7 - The following diagram shows the potential energy...Ch. 7 - Two electrostatic potential maps are shown, one of...Ch. 7 - Prob. 7.34CPCh. 7 - Which of the following drawings is most likely to...Ch. 7 - The following ball-and-stick molecular model is a...Ch. 7 - The following hall-and-stick molecular model is a...Ch. 7 - Sinapaldehyde, a compound present in the toasted...Ch. 7 - Vitamin C (ascorbic acid) has the following...Ch. 7 - Match the following descriptions with the type of...Ch. 7 - Why do two atoms come together to form a covalent...Ch. 7 - Explain the difference in the bond dissociation...Ch. 7 - Explain the difference in the bond dissociation...Ch. 7 - Predict which of the following bonds should be...Ch. 7 - Prob. 7.45SPCh. 7 - What general trends in electro negativity occur in...Ch. 7 - Predict the electro negativity of the undiscovered...Ch. 7 - Order the following elements according to...Ch. 7 - Order the following elements according to...Ch. 7 - Which of the following substances contain bonds...Ch. 7 - Use the electro negativity data in Figure 7.4 to...Ch. 7 - Show the direction of polarity for each of the...Ch. 7 - Show the direction of polarity for each of the...Ch. 7 - Which of the substances...Ch. 7 - Which of the substances...Ch. 7 - Order the following compounds according to the...Ch. 7 - Order the following compounds according to the...Ch. 7 - Prob. 7.58SPCh. 7 - Using only the elements Ca, Cl, and Si, give...Ch. 7 - The dipole moment of BrCl is 0.518 D, and the...Ch. 7 - Prob. 7.61SPCh. 7 - Prob. 7.62SPCh. 7 - Prob. 7.63SPCh. 7 - Why does the octet rule apply primarily to...Ch. 7 - Which of the following substances contains an atom...Ch. 7 - Draw electron-dot structures for the following...Ch. 7 - Draw electron-dot structures for the following...Ch. 7 - Identify the correct electron-dot structure for...Ch. 7 - Draw an electron.dot structure for the hydronium...Ch. 7 - Oxalic acid, H2C2O4 , is a mildly poisonous...Ch. 7 - Draw an electron-dot structure for carbon...Ch. 7 - Prob. 7.72SPCh. 7 - Identify the fourth-row elements, X, that form the...Ch. 7 - Write electron-dot structures for molecules with...Ch. 7 - Write electron-dot structures for molecules with...Ch. 7 - Which compound do you expect to have the stronger...Ch. 7 - Which compound do you expect to have the stronger...Ch. 7 - Draw an electron-dot structure for each of the...Ch. 7 - Prob. 7.79SPCh. 7 - Methylphenidate (C14H19NO2) , marketed as Ritalin,...Ch. 7 - Pregabalin (C8H17NO2) , marketed as Lyric a, is an...Ch. 7 - The following molecular model is that of...Ch. 7 - Ibuprofen C 13 H 18 O 2 marketed under such brand...Ch. 7 - Draw as many resonance structures as you can that...Ch. 7 - Draw as many resonance structures as you can for...Ch. 7 - Which of the following pairs of structures...Ch. 7 - Which of the following pairs of structures...Ch. 7 - Draw as many resonance structures as you can that...Ch. 7 - Draw as many resonance structures as you can that...Ch. 7 - Benzene has the following structural formula. Use...Ch. 7 - Draw three resonance structures for sulfur...Ch. 7 - Some mothballs used when storing clothes are made...Ch. 7 - Four different structures (a), (b), (c), and (d)...Ch. 7 - Draw an electron-dot structure for carbon...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Calculate formal charges for the C and O atoms in...Ch. 7 - Draw two electron-dot resonance structures that...Ch. 7 - Draw two electron-dot resonance structures that...Ch. 7 - Prob. 7.102SPCh. 7 - Prob. 7.103SPCh. 7 - Boron trifluoride reacts with dimethyl ether to...Ch. 7 - Thiofulminic acid, HCNS, has recently been...Ch. 7 - Draw two rcsonancc strutur for methyl isocyanate,...Ch. 7 - In the cyanatc ion. OCN , carbon is the central...Ch. 7 - Prob. 7.108MPCh. 7 - Prob. 7.109MPCh. 7 - Prob. 7.110MPCh. 7 - The neutral OH molecule has been implicated in...Ch. 7 - Prob. 7.112MPCh. 7 - Prob. 7.113MP
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- ● Biological Macromolecules Identifying the parts of a disaccharide Take a look at this molecule, and then answer the questions in the table below it. CH2OH O H H H OH OH OH H H CH2OH H O OH H OH H H H H OH Is this a reducing sugar? Does this molecule contain a glycosidic bond? If you said this molecule does contain a glycosidic bond, write the symbol describing it. If you said this molecule does contain a glycosidic bond, write the common names (including anomer and enantiomer labels) of the molecules that would be released if that bond were hydrolyzed. If there's more than one molecule, separate each name with a comma. Explanation Check O yes X O no ○ yes O no Uarrow_forwardThe aim of the lab is to measure the sodium content from tomato sauce using the Mohr titration method. There are two groups being: Regular Tomato sauce & Salt Reduced tomato sauce QUESTION: State how you would prepare both Regular & Salt reduced tomato sauce samples for chemical analysis using the Mohr titration methodarrow_forwardUsing 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_forward
- 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
- 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 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_forwardplease explain this in simple termsarrow_forward
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