Bundle: General, Organic, and Biological Chemistry, 7th + OWLv2 Quick Prep for General Chemistry, 4 terms (24 months) Printed Access Card
7th Edition
ISBN: 9781305717534
Author: H. Stephen Stoker
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 20.56EP
Write a generalized structural representation for a peptide bond.
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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
Ar
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
☐
Decide 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".
☑
Chapter 20 Solutions
Bundle: General, Organic, and Biological Chemistry, 7th + OWLv2 Quick Prep for General Chemistry, 4 terms (24 months) Printed Access Card
Ch. 20.1 - Prob. 1QQCh. 20.1 - Proteins are naturally occurring unbranched...Ch. 20.2 - Prob. 1QQCh. 20.2 - How do the various standard amino acids differ...Ch. 20.2 - The number of carboxyl groups and amino groups...Ch. 20.2 - How many different subclassifications are there...Ch. 20.2 - Which of the following statements concerning...Ch. 20.3 - Prob. 1QQCh. 20.3 - Proteins from plant sources are a. always complete...Ch. 20.3 - Prob. 3QQ
Ch. 20.4 - Prob. 1QQCh. 20.4 - Which of the following groups is positioned at the...Ch. 20.4 - Which of the following statements concerning...Ch. 20.5 - Which of the standard amino acids exist as...Ch. 20.5 - Which of the following is the zwitterion ion...Ch. 20.5 - Which of the following is the structural form for...Ch. 20.6 - Prob. 1QQCh. 20.6 - Prob. 2QQCh. 20.7 - The joining together of two amino acids to form a...Ch. 20.7 - The number of peptide bonds present in a...Ch. 20.7 - Which of the following statements concerning the...Ch. 20.7 - Prob. 4QQCh. 20.7 - How many isomeric tripeptides can be formed from...Ch. 20.8 - The two best-known peptide hormones present in the...Ch. 20.8 - Which of the following peptides is an important...Ch. 20.9 - The term protein is generally reserved for...Ch. 20.9 - Prob. 2QQCh. 20.9 - Which of the following is not a distinguishing...Ch. 20.10 - Specifying the primary structure of a protein...Ch. 20.10 - Prob. 2QQCh. 20.10 - Prob. 3QQCh. 20.11 - Prob. 1QQCh. 20.11 - Prob. 2QQCh. 20.11 - Prob. 3QQCh. 20.12 - Prob. 1QQCh. 20.12 - Hydrophobic interactions associated with protein...Ch. 20.12 - R group interactions between which of the...Ch. 20.13 - Prob. 1QQCh. 20.13 - Which of the following types of interactions does...Ch. 20.14 - The complete hydrolysis of a protein produces a...Ch. 20.14 - Which of the following statements concerning...Ch. 20.15 - Which of the following levels of protein structure...Ch. 20.15 - Which of the following does not involve protein...Ch. 20.15 - Prob. 3QQCh. 20.16 - Prob. 1QQCh. 20.16 - Prob. 2QQCh. 20.16 - Prob. 3QQCh. 20.16 - In which of the following pairs of proteins are...Ch. 20.17 - Insulin and human growth hormone are examples of...Ch. 20.17 - Myoglobin and transferrin are examples of a....Ch. 20.17 - Prob. 3QQCh. 20.18 - Prob. 1QQCh. 20.18 - Prob. 2QQCh. 20.18 - Prob. 3QQCh. 20.19 - Prob. 1QQCh. 20.19 - Which of the following types of plasma...Ch. 20.19 - Prob. 3QQCh. 20 - Prob. 20.1EPCh. 20 - What element is always present in proteins that is...Ch. 20 - What percent of a cells overall mass is accounted...Ch. 20 - Approximately how many different proteins are...Ch. 20 - What is signified when an amino acid is designated...Ch. 20 - What functional groups are present in all -amino...Ch. 20 - Indicate whether or not each of the following...Ch. 20 - Indicate whether or not each of the following...Ch. 20 - How many carbon atoms are present in the R group...Ch. 20 - How many carbon atoms are present in the R group...Ch. 20 - With the help of Table 20-1, determine the name...Ch. 20 - With the help of Table 20-1, determine the name...Ch. 20 - With the help of Table 20-1, classify each of the...Ch. 20 - With the help of Table 20-1, classify each of the...Ch. 20 - Prob. 20.15EPCh. 20 - With the help of Table 20-1, classify each of the...Ch. 20 - Prob. 20.17EPCh. 20 - Prob. 20.18EPCh. 20 - Prob. 20.19EPCh. 20 - Prob. 20.20EPCh. 20 - Prob. 20.21EPCh. 20 - How many amino groups and how many carboxyl groups...Ch. 20 - Prob. 20.23EPCh. 20 - Which two of the standard amino acids are...Ch. 20 - Prob. 20.25EPCh. 20 - Prob. 20.26EPCh. 20 - Prob. 20.27EPCh. 20 - Prob. 20.28EPCh. 20 - Prob. 20.29EPCh. 20 - Prob. 20.30EPCh. 20 - Indicate whether or not the designation...Ch. 20 - Indicate whether or not the designation...Ch. 20 - Prob. 20.33EPCh. 20 - Prob. 20.34EPCh. 20 - To which family of mirror-image isomers do nearly...Ch. 20 - In what way is the structure of glycine different...Ch. 20 - Draw Fischer projection formulas for the following...Ch. 20 - Draw Fischer projection formulas for the following...Ch. 20 - Answer the following questions about the amino...Ch. 20 - Answer the following questions about the amino...Ch. 20 - At room temperature, amino acids are solids with...Ch. 20 - At room temperature, most amino acids are not very...Ch. 20 - Prob. 20.43EPCh. 20 - Draw the zwitterion structure for each of the...Ch. 20 - Draw the structure of serine at each of the...Ch. 20 - Prob. 20.46EPCh. 20 - Prob. 20.47EPCh. 20 - Most amino acids have isoelectric points between...Ch. 20 - Glutamic acid exists in two low-pH forms instead...Ch. 20 - Arginine exists in two high-pH forms instead of...Ch. 20 - In a low-pH aqueous solution, indicate whether...Ch. 20 - Prob. 20.52EPCh. 20 - When two cysteine molecules dimerize, what happens...Ch. 20 - What chemical reaction involving the cysteine...Ch. 20 - What two functional groups are involved in the...Ch. 20 - Write a generalized structural representation for...Ch. 20 - For the tripeptide GlyAlaCys a. What amino acid is...Ch. 20 - For the tripeptide SerValMet a. What amino acid is...Ch. 20 - Prob. 20.59EPCh. 20 - Prob. 20.60EPCh. 20 - Draw a complete condensed structural...Ch. 20 - Draw a complete condensed structural...Ch. 20 - With the help of Table 20-1, identify the amino...Ch. 20 - With the help of Table 20-1, identify the amino...Ch. 20 - With the help of Table 20-1, assign an IUPAC name...Ch. 20 - With the help of Table 20-1, assign an IUPAC name...Ch. 20 - Prob. 20.67EPCh. 20 - Prob. 20.68EPCh. 20 - For the tripeptide AlaValGly which amino acid...Ch. 20 - For the tripeptide SerArgIle which amino acid...Ch. 20 - Consider the tripeptide tyrosylleucylisoleucine....Ch. 20 - Consider the tripeptide leucylvalyltryptophan. a....Ch. 20 - Explain why the notations SerCys and CysSer...Ch. 20 - Explain why the notations AlaGlyValAla and...Ch. 20 - Prob. 20.75EPCh. 20 - There are a total of six different amino acid...Ch. 20 - Compare the structures of the protein hormones...Ch. 20 - Compare the protein hormones oxytocin and...Ch. 20 - Compare the binding-site locations in the brain...Ch. 20 - Compare the structures of the peptide...Ch. 20 - Prob. 20.81EPCh. 20 - Prob. 20.82EPCh. 20 - What is the major difference between a monomeric...Ch. 20 - What is the major difference between a simple...Ch. 20 - Prob. 20.85EPCh. 20 - Prob. 20.86EPCh. 20 - Prob. 20.87EPCh. 20 - Two proteins with the same amino acid composition...Ch. 20 - How many different primary structures are possible...Ch. 20 - How many different primary structures are possible...Ch. 20 - How many different primary structures are possible...Ch. 20 - How many different primary structures are possible...Ch. 20 - Prob. 20.93EPCh. 20 - Draw a segment of the backbone of a protein that...Ch. 20 - Prob. 20.95EPCh. 20 - In a pleated sheet secondary structure for a...Ch. 20 - Indicate whether each of the following statements...Ch. 20 - Indicate whether each of the following statements...Ch. 20 - Prob. 20.99EPCh. 20 - Prob. 20.100EPCh. 20 - State the four types of attractive forces that...Ch. 20 - Prob. 20.102EPCh. 20 - Prob. 20.103EPCh. 20 - Prob. 20.104EPCh. 20 - Prob. 20.105EPCh. 20 - Prob. 20.106EPCh. 20 - Prob. 20.107EPCh. 20 - Prob. 20.108EPCh. 20 - Prob. 20.109EPCh. 20 - Not all proteins have quaternary structure....Ch. 20 - Prob. 20.111EPCh. 20 - Prob. 20.112EPCh. 20 - Prob. 20.113EPCh. 20 - Prob. 20.114EPCh. 20 - Prob. 20.115EPCh. 20 - Prob. 20.116EPCh. 20 - Prob. 20.117EPCh. 20 - Prob. 20.118EPCh. 20 - Identify the primary structure of a hexapeptide...Ch. 20 - Identify the primary structure of a hexapeptide...Ch. 20 - Draw structural formulas for the products obtained...Ch. 20 - Prob. 20.122EPCh. 20 - Which structural levels of a protein are affected...Ch. 20 - Prob. 20.124EPCh. 20 - In what way is the protein in a cooked egg the...Ch. 20 - Why is cooked protein more easily digested than...Ch. 20 - Indicate whether or not each of the following...Ch. 20 - Prob. 20.128EPCh. 20 - Prob. 20.129EPCh. 20 - Contrast fibrous and globular proteins in terms of...Ch. 20 - Classify each of the following proteins as a...Ch. 20 - What is the major biochemical function of each of...Ch. 20 - Prob. 20.133EPCh. 20 - Prob. 20.134EPCh. 20 - Prob. 20.135EPCh. 20 - Prob. 20.136EPCh. 20 - Prob. 20.137EPCh. 20 - Where are the carbohydrate units located in...Ch. 20 - Prob. 20.139EPCh. 20 - Prob. 20.140EPCh. 20 - Prob. 20.141EPCh. 20 - Prob. 20.142EPCh. 20 - Prob. 20.143EPCh. 20 - Describe the process by which blood...Ch. 20 - Prob. 20.145EPCh. 20 - Prob. 20.146EPCh. 20 - Prob. 20.147EPCh. 20 - Prob. 20.148EPCh. 20 - Prob. 20.149EPCh. 20 - Prob. 20.150EPCh. 20 - Prob. 20.151EPCh. 20 - Prob. 20.152EP
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- 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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- Draw the Lewis structure for the polyatomic phosphite (PO¾³¯) a anion. Be sure to include all resonance structures that satisfy the octet rule. C I A [ ]¯arrow_forwardDecide whether these proposed Lewis structures are reasonable. proposed Lewis structure Is the proposed Lewis structure reasonable? Yes. :0: Cl C C1: 0=0: : 0 : : 0 : H C N 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_forwardDraw the Lewis structure for the polyatomic trisulfide anion. Be sure to include all resonance structures that satisfy the octet rule. с [ ] - Garrow_forward
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