Solution Manual For Organic Chemistry: A Guided Inquiry, 2nd Edition
Stay on top of your textbook work with Solution Manual For Organic Chemistry: A Guided Inquiry, 2nd Edition, a guide offering complete solutions for every exercise.
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ChemActivity 1: Bond Angles and Shape
(What are the bond angles and shape of CH 4 ?)
Model 1: Planetary Model of an Atom
In a planetary model of an atom, negatively charged electrons (–1 each) are arranged around a
positively charged nucleus (+Z = nuclear charge) in a series of shells that look like orbits.
+1
= electron
+6 +7 +8 +9 +10
H C N O F Ne
shell #1
shell #2
Figure 1.1: Valence Shell Representations of Hydrogen, Carbon, Nitrogen, Oxygen, Fluorine, and Neon
core electrons = electrons in any inner shell(s) (don’t participate in bonding)
core atom = the nucleus (made up of protons and neutrons) plus the core electrons
valence electrons = electrons in the outermost shell (participate in bonding)
valence shell = outermost shell, where valence electrons are found
Electrons DO NOT “orbit” the nucleus like the planets orbit the sun. In ChemActivity 3 we will study a more complex model
in which electrons are described as inhabiting 3-dimensional regions of space called “orbitals” (1s, 2s, 2px, 2py, 2pz, 3s, etc.).
Critical Thinking Questions
1. (E) What does the number (+Z) at the center of each atom in Figure 1.1 represent, and what
number would you expect at the center of a representation of a bromine atom (Br)?
2. (E) How many total electrons does an oxygen atom have, and how could you find the answer to
this using a periodic table?
3. (E) How many valence electrons does each atom in Figure 1.1 have, and what number on a
periodic table gives you these answers?
4. What is the maximum number of electrons that can fit in…
a. (E) shell No. 1?
b. (E) shell No. 2 (Neon has a full Shell No. 2)?
c. Describe how the answers to a) and b) are contained in the structure of the periodic table.
(What are the bond angles and shape of CH 4 ?)
Model 1: Planetary Model of an Atom
In a planetary model of an atom, negatively charged electrons (–1 each) are arranged around a
positively charged nucleus (+Z = nuclear charge) in a series of shells that look like orbits.
+1
= electron
+6 +7 +8 +9 +10
H C N O F Ne
shell #1
shell #2
Figure 1.1: Valence Shell Representations of Hydrogen, Carbon, Nitrogen, Oxygen, Fluorine, and Neon
core electrons = electrons in any inner shell(s) (don’t participate in bonding)
core atom = the nucleus (made up of protons and neutrons) plus the core electrons
valence electrons = electrons in the outermost shell (participate in bonding)
valence shell = outermost shell, where valence electrons are found
Electrons DO NOT “orbit” the nucleus like the planets orbit the sun. In ChemActivity 3 we will study a more complex model
in which electrons are described as inhabiting 3-dimensional regions of space called “orbitals” (1s, 2s, 2px, 2py, 2pz, 3s, etc.).
Critical Thinking Questions
1. (E) What does the number (+Z) at the center of each atom in Figure 1.1 represent, and what
number would you expect at the center of a representation of a bromine atom (Br)?
2. (E) How many total electrons does an oxygen atom have, and how could you find the answer to
this using a periodic table?
3. (E) How many valence electrons does each atom in Figure 1.1 have, and what number on a
periodic table gives you these answers?
4. What is the maximum number of electrons that can fit in…
a. (E) shell No. 1?
b. (E) shell No. 2 (Neon has a full Shell No. 2)?
c. Describe how the answers to a) and b) are contained in the structure of the periodic table.
ChemActivity 1: Bond Angles and Shape 9
Model 2: Bonding and Non-bonding Electron Domains
Bonding electron domain = shared valence electrons (2, 4, or 6e—) localized between two core atoms
3 types Æ Single Bond (1 pair, 2 electrons); Double Bond (2 pairs, 4 e—); Triple Bond (3 pairs, 6 e—)
Non-bonding electron domain (“lone pair”) = pair of valence electrons (2 e—) not involved in a bond
One way to think of a bond: two positively charged core atoms mutually attracted to the negatively
charged electrons that are localized between them.
+8valence shell
representation*
dot shorthand
electron domain
bond-line
ball & stick
space filling
H H O O N N
+1 +1 +8 +7+7
O O N NH H
H H O O N N
Figure 1.2: Example of a Single, Double, and Triple Bond
Critical Thinking Questions
5. (E) How many electrons are in a triple bond?
6. (E) Identify each lone pair shown in the first four rows of Figure 1.2.
7. (E) Each molecule in Figure 1.2 has exactly one bonding electron domain. Identify it and…
a. label what type of bonding electron domain it is.
b. report the number of electrons in each bonding electron domain.
8. You hear a student from a nearby group say that “Electron domains repel one another.” Cite
evidence from Figure 1.2 to support or refute this statement.
Model 2: Bonding and Non-bonding Electron Domains
Bonding electron domain = shared valence electrons (2, 4, or 6e—) localized between two core atoms
3 types Æ Single Bond (1 pair, 2 electrons); Double Bond (2 pairs, 4 e—); Triple Bond (3 pairs, 6 e—)
Non-bonding electron domain (“lone pair”) = pair of valence electrons (2 e—) not involved in a bond
One way to think of a bond: two positively charged core atoms mutually attracted to the negatively
charged electrons that are localized between them.
+8valence shell
representation*
dot shorthand
electron domain
bond-line
ball & stick
space filling
H H O O N N
+1 +1 +8 +7+7
O O N NH H
H H O O N N
Figure 1.2: Example of a Single, Double, and Triple Bond
Critical Thinking Questions
5. (E) How many electrons are in a triple bond?
6. (E) Identify each lone pair shown in the first four rows of Figure 1.2.
7. (E) Each molecule in Figure 1.2 has exactly one bonding electron domain. Identify it and…
a. label what type of bonding electron domain it is.
b. report the number of electrons in each bonding electron domain.
8. You hear a student from a nearby group say that “Electron domains repel one another.” Cite
evidence from Figure 1.2 to support or refute this statement.
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