Test Review : Chapter 1 Vocab./ Scientific Method Honors Chemistry.
Chapter 7 Ionic and Metallic Bonding 1. Chapter 7 and 8 Vocab 1. Alloys 2. Chemical formula 3....
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Transcript of Chapter 7 Ionic and Metallic Bonding 1. Chapter 7 and 8 Vocab 1. Alloys 2. Chemical formula 3....
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Chapter 7
Ionic and Metallic Bonding
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Chapter 7 and 8 Vocab1. Alloys
2. Chemical formula
3. Coordination number
4. Electron dot structure
5. Formula unit
6. Halide ion
7. Ionic bonds
8. Ionic compounds
9. Metallic bonds
10. Octet rule
11. Valence electron
12. Covalent Bond
13. Coordinate Covalent Bond
14. Diatomic Molecule
15. Dipole
16. Dispersion Forces
17. Double Covalent Bond
18. Hydrogen Bonds
19. Molecular Compound
20. Molecular Formula
21. Molecule
22. Nonpolar Covalent Bond
23. Polar Covalent Bond
24. Polar Molecule
25. Polyatomic Ion
26. Resonance Structure
27. Single Covalent Bond
28. Structural Formula
29. Triple Covalent Bond
30. Unshared Pair
31. Van der Waals forces
32. VSEPR Theory
Define all of them for 5 EC points
Define the red ones for 3 EC points
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Section 1 - Ions
Read pages 187-193
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Valence Electrons
electrons in the last energy level involved in bonding
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Page 188, Table 7.1Do You See a Pattern?
13 171421 181615
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Group 1 = 1 Valence Electron Group 2 = 2 Valence Electrons Groups 3-12 = VARY in Valence Electrons Group 13 = 3 Valence Electrons Group 14 = 4 Valence Electrons Group 15 = 5 Valence Electrons Group 16 = 6 Valence Electrons Group 17 = 7 Valence Electrons Group 18 = 8 Valence Electrons
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ONE exception to this pattern
Helium Why?
only has 2 valence electrons
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Electron Dot Structures
diagram that shows the valence electrons as dots
one dot (electron) on each side before start pairing up
8
O O
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Electron Dot Structures PracticeDraw the electron dot structures for:
Rb Ba PI
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Octet Rule
atoms want to acquire 8 electrons in their outermost energy level to become stable Again, the idea of full s and p sublevels
atoms will react with each other in some bonding way to obtain these 8 valence electrons 2 Exceptions:
H & HeOnly need 2 valence electrons
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Cation
atom loses electrons, metals a positively charged ion name stays the same
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Example
Na (atom) structure Na )2e- )8e- )1e-
What does Na need to become stable (happy)? 8 Valence Electrons
Is it easier for Na to lose its 1 ve- or gain 7 electrons? LOSE 1
So the Na atom becomes Na ion: Na+1 (ion – cation) Na )2e- )8e- (lost the outer e-)
Now Na is stable and the name stays sodium Looks like Ne but still has Na properties
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Anion
atom gains electrons, nonmetals a negatively charged ion name changes to –ide ending
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Example
Cl (atom) structure Cl )2e- )8e- )7e-
What does Cl need to become stable (Happy)? 8 Valence Electrons
Is it easier for Chlorine to lose its 7 ve- or gain 1 electron? GAIN 1
So the Cl atom becomes Cl ion: Cl-1 (ion – anion) Cl )2e- )8e- )8e- (gained 1
e-)
Now Cl is stable and the name changes to chloride
Looks like Ar but still has Cl properties
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Practice ProblemsGive the name and symbol of the ion formed when:
a. A nitrogen atom gains three electrons
b. A calcium atom loses two electrons
c. A fluorine atom gains one electron
d. An arsenic atom gains three electrons
e. A beryllium atom loses two electrons
a. nitride, N3-
b. calcium, Ca2+
c. fluoride, F-
d. arsenide, As3-
e. beryllium, Be2+
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Charges based on groups Group 1 = Ions with a +1 charge (lost 1 electron) Group 2 = Ions with a +2 charge (lost 2 electrons) Groups 3-12 = Ions with various charges (all cations) Group 13 = Ions with a +3 charge (lost 3 electrons) Group 14 = Ions with a +/- 4 charge (lost or gained 4 electrons) Group 15 = Ions with a -3 charge (gained 3 electrons) Group 16 = Ions with a -2 charge (gained 2 electrons) Group 17 = Ions with a -1 charge (gained 1 electron) Group 18 = Does not form ions (already stable)
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Add to your Periodic Table Reference Sheet!+1 N/A
1+2 +3 ±4 -3 -2 -1
8
2 3 4 5 6 7Charge
Number of Valence Electrons
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What will the charge be? Also, name the ion formed.
Li
Al
Br
+
-
3+
Lithium
Bromide
Aluminum
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QUICK QUIZSection 7.1
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1. How many valence electrons are there in an atom of oxygen?
a. 2
b. 4
c. 6
d. 8
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2. Atoms that tend to gain a noble gas configuration by losing valence electrons are
a. metals.
b. nonmetals.
c. noble gases.
d. representative elements.
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3. When a magnesium atom forms a cation, it does so bya. losing two electrons.
b. gaining two electrons.
c. losing one electron.
d. gaining one electron.
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4. When a bromine atom forms an anion, it does so bya. losing two electrons.
b. gaining two electrons.
c. losing one electron.
d. gaining one electron.
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What’s Next?
Book Work: Page 193 #3-10
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Page 193 #3-10
3. How can you determine the number of valence electrons in a representative element?
4. Atoms of which elements tend to gain electrons? Atoms of which elements tend to lose electrons?
5. How do cations form?
6. How do anions form?
7. How many valence electrons are in each atom?
a. Potassium
b. Carbon
c. Magnesium
d. Oxygen
8. Draw the electron dot structure for each element in Question 7.
9. How many electrons will each element gain or lose in forming an ion?
a) Calcium
b) Fluorine
c) Aluminum
d) Oxygen
10. Write the name and symbol of the ion formed when:
3. Potassium loses one electron
4. Zinc loses two electrons
5. Fluorine gains one electron
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#3 – How can you determine the number of valence electrons in the atom of a
representative element?
Look at the group number Group 1 = 1 valence Group 2 = 2 valence Group 13 = 3 valence Etc.
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#4 – Atoms of which elements tend to gain electrons? Atoms of which elements tend to
lose electrons?
Nonmetals tend to gain electrons
Metals tend to lose electrons
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#5 – How do cations form?
An atom loses valence electrons to form a positive
ion
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#6 – How do anions form?
An atom gains valence electrons to form a
negative ion
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#7 – How many valence electrons are in each atom?
Potassium Carbon Magnesium Oxygen
1 4 2 6
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#8 – Draw the electron dot structure for each element in Question 7.
K, C, Mg, O
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#9 – How many electrons will each element gain or lose in forming an ion?
Calcium Fluorine Aluminum Oxygen
lose 2 gain 1 lose 3 gain 2
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#10 – Write the name and symbol of the ion formed when:
a) Potassium loses one electron
b) Zinc loses two electrons
c) Fluorine gains one electron
K+
Zn2+
F-
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Section 2 -Ionic Bonds and Ionic CompoundsRead pages 194-199
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Ionic Bonds
opposite charges attract transfer of electrons between a metal and a nonmetal called a salt
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How Ionic Bonds Form: Sodium and Chlorine
Na ** *Cl** **
= ** -1
Na+1 *Cl** **
= NaCl
Sodium Chloride
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Example: Sodium and Oxygen
Na
Na
** *O**
*=
** -2
Na+1 *O** Na+1 *
= Na2O
Sodium Oxide
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Example: Magnesium and Oxygen
Mg
** *O**
*=
** -2
Mg+2 *O** *
= MgO
Magnesium Oxide
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Formula Unit
lowest whole-number ratio of ions in an ionic compound
Ratio of Na to Cl is 1:1
Ratio of Mg to Cl is 1:2
NaCl
MgCl2
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12. a. KI – Potassium Iodide
b. Al2O3 – Aluminum Oxide
13. CaCl2 – Calcium Chloride
And NAME them
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Short Cut – Crisscross Method
1. Determine the charge on each ion.
2. Cross the charges.
3. Reduce if necessary.
4. Name the compound.
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Example 1 – Barium and Nitrogen
Ba N2+ 3-
Ba3N2Barium Nitride
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Example 2 – Magnesium and Oxygen
Mg O2+ 2-
Mg2O2
Magnesium OxideMgO
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Practice Problems
Determine the chemical formulas and names of the ionic compounds formed when the following elements combine:
a. magnesium and chlorine MgCl2 = Magnesium Chloride
b. aluminum and sulfur Al2S3 = Aluminum Sulfide
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Ionic Compounds Properties
crystalline solids high melting points conduct electricity when dissolved in water
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LET’S REVIEW
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Short Cut – Crisscross Method
1. Determine the charge on each ion.
2. Cross the charges.
3. Reduce if necessary.
4. Name the compound.
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Example – Aluminum and Chlorine
Al Cl3+ -
AlCl3Aluminum Chloride
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Write the correct chemical formula for the chemical compounds formed from each pair of
ions. Name the compound that is formed.
a. Rb+, O2-
b. Ca2+, N3-
c. Fr+, F-
d. Al3+, P3-
Rb2O
Ca3N2
FrF
AlP
Rubidium Oxide
Calcium Nitride
Francium Fluoride
Aluminum Phosphide
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Write formulas for each compound.
a. Strontium iodide
b. Lithium boride
c. Beryllium sulfide
d. Potassium selenide
Srl2
Li3B
BeS
K2Se
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Decide whether or not the following pairs of elements will form ionic bonds. If not, explain.
a. Na and Ne
b. K and Br
c. N and S
d. Rb and Be
No Ne is a noble gas
Yes
NoBoth are
nonmetals
NoBoth are metals
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QUICK QUIZSection 7.2
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1. Which chemical formula is incorrect?a. KF2
b. CaS
c. MgO
d. NaBr
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2. At room temperature, most ionic compounds area. crystalline solids.
b. liquids.
c. gases.
d. soft, low melting-point solids.
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What’s Next?
Book Work: Page 199 #14-20, 22
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#14 – How can you describe the electrical charge of an ionic compound?
Electrically neutral
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#15 – What properties characterize ionic compounds?
crystalline solids high melting points
conduct electricity when dissolved in water
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#17 – How can you represent the composition of an ionic bond?
formula unit
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#18 – Write the correct chemical formula for the chemical compounds formed from each pair of
ions:
a. K+, S2-
b. Ca2+, O2-
c. Na+, O2-
d. Al3+, N3-
K2S
CaONa2OAlN
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#19 – Write formulas for each compound.
a. Barium chloride
b. Magnesium Oxide
c. Lithium Oxide
d. Calcium Fluoride
BaCl2
MgO
Li2O
CaF2
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#20 – Which pairs of elements are likely to form ionic compounds?
a. Cl, Br
b. Li, Cl
c. K, He
d. I, Na
No Both are nonmetals
Yes
NoHe is a
noble gas
Yes
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#22 – Why do ionic compounds conduct electricity when they are melted or dissolved in
water?
Ions become free to move around
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Section 3 -Bonding in Metals
Read pages 201-203
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Metallic Bond
attraction of the free-floating valence electrons“sea of electrons”
between a metal and a metal
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Metallic Bond Properties
good conductors of electricity ductile - drawn into wire
example: copper wire malleable - hammered into sheets
example: aluminum foil atoms are compacted with an orderly pattern
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Alloy
mixture of metals properties are superior
to those of their component elements
More durable than pure silver, but is still
soft enough to be made into jewelry
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Bicycle frames are often made of titanium alloys that contain aluminum and vanadium.
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QUICK QUIZSection 7.3
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1. The valence electrons of metals can be modeled asa. a body-centered cube.
b. octets of electrons.
c. a rigid array of electrons.
d. a sea of electrons.
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2. In most metals, the atoms are
a. free to move from one part of the metal to another.
b. arranged in a compact and orderly pattern.
c. placed at irregular locations.
d. randomly distributed.
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3. Alloys are important because theya. are pure substances.
b. are the ores from which metals can be refined.
c. can have properties superior to those of their components.
d. are produced by the combustion of metals.
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What’s Next?
Book Work: Page 203 #23-26
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#23 – How do chemists model the valence electrons in metal atoms?
A sea of electrons
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#24 – How can you describe the arrangement of atoms in metals?
Compact, orderly patterns
These tomatoes have a closed-packed arrangement. Similar arrangements can be found in the crystalline structure of metals.
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#25 – Why are alloys more useful than pure metals?
Their properties are often superior to those of their
component elements
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#26 – Describe what is meant by ductile and malleable.
Ductile can be drawn into wires
Malleable can be hammered or forced into shapes
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Chapter 8
Covalent Bonding
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Section 1 -Molecular CompoundsRead pages 213-216
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Covalent Bond
Sharing of electronsSharing is Caring!
between a nonmetal and a nonmetal called a molecule
diatomic molecule – consists of the same two atoms
examples: Br2 I2 N2 Cl2 H2 O2 F2
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Covalent Compounds Properties
gases or liquids low melting points do not conduct electricity when dissolved
in water
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Molecular Formula
Chemical formula for the molecular (covalent) compound
Shows how many atoms of each element are in a compound – does not show arrangement
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QUICK QUIZSection 8.1
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1. Compared to ionic compounds, molecular compounds tend to have relativelya. low melting points and high boiling points.
b. low melting points and low boiling points.
c. high melting points and high boiling points.
d. high melting points and low boiling points.
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2. A molecular compound usually consists of a. two metal atoms and a nonmetal atom.
b. two nonmetal atoms and a metal atom.
c. two or more metal atoms.
d. two or more nonmetal atoms.
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3. A molecular formula shows
a. how many atoms of each element a molecule contains.
b. a molecule's structure.
c. which atoms are bonded together.
d. how atoms are arranged in space.
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What’s Next?
Book Work: Page 216 #1-6
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#1 – How are the melting points and boiling points of molecular compounds usually different
from ionic compounds?
The MP and BP of molecular compounds is
usually relatively low compared to ionic
compounds
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#2 – What information does a molecular formula provide?
How many atoms of each element a molecule
contains
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#3 – What are the only elements to exist in nature as uncombined atoms? What term is
used to describe such elements?
Noble Gases He, Ne, Ar, Kr, Xe, Rn
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#4 – Describe how a molecule whose formula is NO is different from a molecule whose
formula is N2O.
1 nitrogen bonded to 1 oxygen 2 nitrogens bonded to 1 oxygen
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#5 – Give an example of a diatomic molecule that is found in the Earth’s atmosphere.
Oxygen, Nitrogen
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#6 – What information does a molecule’s molecular structure give?
The arrangement of atoms within a molecule
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Section 2 -The Nature of Covalent BondingRead pages 217-222
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Structural Formula represents the covalent bonds by dots and
dashes single bond
sharing of 2 electronsone dash line
unshared pair or lone pairnonbonded pair of electrons
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Page 218Go through examples
FormulaF2
FormulaH2O
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Page 219Go through examples
FormulaNH3
FormulaCH4
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7. a. Cl2 b. Br2 c. I2
Cl Cl Cl Clor
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Practice Problems
The following covalent molecules have only single covalent bonds. Draw an electron dot structure for each.NF3
SBr2
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Double bond sharing of 4 electrons two dash lines
Triple Bond sharing of 6 electrons three dash lines
Double Vs. Triple Bonds
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Coordinate Covalent Bond A covalent bond in which one atom
contributes both bonding electrons
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Bond Dissociation Energies
Energy required to break the bond between two covalently bonded atoms
A large bond dissociation energy means the bond is difficult to break
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Resonance Structure
A structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion
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Exceptions to the Octet Rule
Limited and expanded octets can occur Limited Octet Example:
Boron
Expanded Octet Example: Phosphorus and Sulfur
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QUICK QUIZSection 8.2
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1. In covalent bonding, atoms attain the
configuration of noble gases bya. losing electrons.
b. gaining electrons.
c. transferring electrons.
d. sharing electrons.
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2. Electron dot diagrams are superior to molecular formulas in that they
a. show which electrons are shared.
b. indicate the number of each kind of atom in the molecule.
c. show the arrangement of atoms in the molecule.
d. are easier to write or draw.
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What’s Next?
Book Work: Page 229 #14, 16, 17, 20, and 21
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#14 – How is an electron dot structure used to represent a covalent bond?
Represents the shared pair of electrons of the covalent
bond by two dots
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#16 – How is a coordinate covalent bond different from other covalent bonds?
The shared electron pair comes from one bonding
atom
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#17 – How is the strength of a covalent bond related to it’s bond dissociation energy?
Higher energy means stronger bond
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#20 – What kinds of information does a structural formula reveal about the compound it
represents?
The atoms that make up the compound
The nature of the bonds
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#21 – Draw electron dot structures for the following molecules, which have only single
covalent bonds.
H2S
PH3
ClF
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Section 3 - Bonding Theories
Read pages 230-236
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Molecular Orbitals
Overlapping atomic orbitals form molecular orbitals
Remember the atomic orbitals: S, P, D and F from Chapter 5?
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Sigma Bonds Formed when two atomic orbitals combine to
form a molecular orbital that is symmetrical around the axis connecting two atomic nuclei
Simply – a single overlap of orbitals end to end Strong bonds Symbol is Greek letter sigma (σ)
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Pi Bonds When two atomic orbitals combine to form a
molecular orbital by overlapping side by side. Simply – an overlap of orbitals side by side Weaker than sigma bonds because of less
overlap Symbol is Greek letter pi (π)
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Comparison of Sigma vs. Pi bonds in a P orbital
Thinking Further:Do you think S orbitals can form pi bonds? NO
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VSEPR Theory
Valence Shell Electron-Pair Repulsion Theory States that because electron pairs repel,
molecules adjust their shapes so that valence electron pairs are as far apart as possible
Helps predict the 3D structure of an atom
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There are multiple different shapes that a molecule can have: Decide the shape by looking at
characteristics of the CENTRAL atomCharacteristics include:
How many bonded pairs How many lone pairs
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Codes for Molecular Geometry All 2 atom molecules are linear!
123Which type of bond is the strongest?
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Linear
Number of Bonded Pairs: 2 Number of Lone Pairs: 0 Example: BeH2
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Bent
Number of Bonded Pairs: 2 Number of Lone Pairs: 2 Example: H2O
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Tetrahedral
Number of Bonded Pairs: 4 Number of Lone Pairs: 0 Example: CH4
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Solid Line – Same PlaneTriangle – In Front of PlaneDotted Line – Behind Plane
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Practice Problems
Determine the molecular shape of the following molecules:1. SBr2
1. Bent
2. HCl1. Linear
3. SiF4
1. Tetrahedral
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Practice Problems
Determine the molecular shape of the following molecules:1. SBr2
1. Bent
2. HCl1. Linear
3. SiF4
1. Tetrahedral
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Practice Problems
Determine the molecular shape of the following molecules:1. SBr2
1. Bent
2. HCl1. Linear
3. SiF4
1. Tetrahedral
i
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QUICK QUIZSection 8.3
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1. The image below shows what type of geometry…
a. Tetrahedral
b. Octahedral
c. Square Pyramidal
d. Trigonal Bipyramidal
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2. Which bond is stronger: Sigma or Pi?
a. Sigma
b. Pi
c. They are equally strong.
d. You cannot tell.
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What’s Next?
Book Work: Page 236 #24 and 27
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#24 – Explain how VSEPR theory can be used to predict the shapes of molecules.
Electron pairs repel one another so the shape is determined by the position where the valence electron pairs are as far away from each other as possible
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#27 – What is a sigma bond? Describe, with the aid of a diagram, how the overlap of two half-filled 1s orbitals produces a sigma bond. A sigma bond is the single overlap of two
atomic orbitals end to end.
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Section 4 -Polar Bonds and MoleculesRead pages 237-241
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Nonpolar Covalent Bond
atoms share the electron equally consists of the same 2 atoms
diatomic molecules
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Polar Covalent Bond
atoms share the electron unequally one atom has a higher electronegativity than the
other and holds onto the electron more
Electronegativity – The ability of an atom
to attract electrons
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Dipole
each atom is partially charged one atom is partially positive, written as d+
Less electronegative element one atom is partially negative, written as d-
More electronegative element
Delta (d +)
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Beside properties, we can mathematically determine if a compound will be
Ionic Polar Covalent Nonpolar Covalent
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What number are we interested in?
Electronegativity Find this number on your periodic table. We want the electronegativity difference
between the two atoms, what math are we going to do?Subtraction
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Do this notation on the back of your periodic table!
Nonpolar Covalent Polar Covalent Ionic0 0.4 2.0 3.2
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Try it!What type of bond is formed by KCl?
FIRSTFind the electronegativity values for K and Cl.
SECONDFind the difference in the values.
3.0 – 0.8 = 2.2THIRDCompare to chart.
IonicNonpolar Covalent Polar Covalent Ionic0 0.4 2.0 3.2
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30. a. polar covalent
b. Ionic
c. polar covalent
d. polar covalent
e. Ionic
f. nonpolar
31. d = c, b, a
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Hydrogen Bond
includes hydrogen weak bonds holds molecules together
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QUICK QUIZSection 8.4
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1. In a molecule, the atom with the largest electronegativity value
a. repels electrons more strongly and acquires a slightly negative charge.
b. repels electrons more strongly and acquires a slightly positive charge.
c. attracts electrons more strongly and acquires a slightly positive charge.
d. attracts electrons more strongly and acquires a slightly negative charge.
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2. When polar molecules are placed between oppositely charged plates, the negative a. molecules stick to the positive plates.
b. molecules stick to the negative plates.
c. ends of the molecules turn toward the positive plates.
d. ends of the molecules turn toward the negative plates.
Next Slide Shows This
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When polar molecules, such as HCl, are placed in an electric field, the slightly negative ends of the molecules become oriented toward the
positively charged plate and the slightly positive ends of the molecules become oriented toward the negatively charged plate.
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What’s Next?
Book Work: Page 244 #32, 37
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#32 – How do electronegativity values determine the charge distribution in a polar
covalent bond?
The more electronegative atom attracts electrons more strongly and
gains a slightly negative charge. The less electronegative atom has a
slightly positive charge.
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#37 – Draw the electron dot structure for each molecule. Identify polar covalent bonds by assigning slightly positive (d+) and slightly
negative (d-) symbols to the appropriate atoms.a) HOOH
b) BrCl
d+ - Br
d- - Cl
c) HBr
d+ - H
d- - Br
d) H2O
d+ - H
d- - O
O O
H H
d- d-
d+ d+
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Overall Review
Make a REVIEW chart, mind map (web), flow chart, or foldable comparing the 3 types of bonds (ionic, metallic, covalent). Be sure to include:
1. types of elements (metal, nonmetal)
2. physical state of matter (solid, liquid, gas)
3. what the electrons do (transferred, shared, free-flowing)
4. melting points (high or low)
5. conductivity (yes or no)
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Ionic Covalent Metallic
Types of Elements
Physical State of Matter
Electrons
Melting Point
Conductivity
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Ionic Covalent Metallic
Types of Elements
Metal and Nonmetal
Nonmetal and Nonmetal
Metal and Metal
Physical State of Matter
Solid Liquid or gas Solid
Electrons Transferred Shared Shared, sea of
electrons
Melting Point High Low High
Conductivity Solid – noAqueous – yes
No Yes