Portage Learning Chem 219 Principles of Organic Chemistry
Module 1 Exam
Question 1
On a piece of scratch paper, write out the Lewis Dot Diagram for each of
the indicated elements and determine the following for each:
a) The number of Lone Pairs the atom possesses in its valence
shell.
b) The number of Unpaired Electrons the atom possesses in its
valence shell.
c) The number of bonds the atom will form.
1. Oxygen
2. Carbon
3. Hydrogen
4. Nitrogen
CORR ANS:
1. O
2. Two lone pairs
3. Two unpaired electrons
4. two bonds
Portage Learning Chem 219 Principles of Organic Chemistry
Module 1 Exam
, 2. C
3. Zero lone pairs
4. Four unpaired electrons
5. four bonds
3. H
4. Zero lone pairs
5. One unpaired electron
6. one bond
4. N
5. One lone pair
6. three unpaired electrons
7. three bonds
Answer:
Oxygen – a) 2 b) 2 c) 2
Carbon – a) 0 b) 4 c) 4
Hydrogen- a) 0 b) 1 c) 1
Nitrogen – a) 1 b) 3 c) 3
Question 2
Classify the bonding between the given pairs of atoms as ionic, covalent,
or polar covalent. Use the table of electronegativities shown below to help
with the classification.
Portage Learning Chem 219 Principles of Organic Chemistry
Module 1 Exam
, a. Br and Br
b. K and Cl
c. P and Cl
d. C and O
e. Na and Br
CORR ANS:
a. covalent
b. Ionic
c. covalent
d. polar covalent
e. ionic
Answer:
a. Br-Br: Electronegativity difference ( ) = 0 = COVALENT (or
pure covalent)
b. K-Cl: ( ) = 2.2 = IONIC
c. P-Cl: ( )= 0.9 = POLAR COVALENT
d. C-O: ( )= 1.0 = POLAR COVALENT
e. Na-Br: ( ) = 1.8 = POLAR COVALENT
Portage Learning Chem 219 Principles of Organic Chemistry
Module 1 Exam
Module 1 Exam
Question 1
On a piece of scratch paper, write out the Lewis Dot Diagram for each of
the indicated elements and determine the following for each:
a) The number of Lone Pairs the atom possesses in its valence
shell.
b) The number of Unpaired Electrons the atom possesses in its
valence shell.
c) The number of bonds the atom will form.
1. Oxygen
2. Carbon
3. Hydrogen
4. Nitrogen
CORR ANS:
1. O
2. Two lone pairs
3. Two unpaired electrons
4. two bonds
Portage Learning Chem 219 Principles of Organic Chemistry
Module 1 Exam
, 2. C
3. Zero lone pairs
4. Four unpaired electrons
5. four bonds
3. H
4. Zero lone pairs
5. One unpaired electron
6. one bond
4. N
5. One lone pair
6. three unpaired electrons
7. three bonds
Answer:
Oxygen – a) 2 b) 2 c) 2
Carbon – a) 0 b) 4 c) 4
Hydrogen- a) 0 b) 1 c) 1
Nitrogen – a) 1 b) 3 c) 3
Question 2
Classify the bonding between the given pairs of atoms as ionic, covalent,
or polar covalent. Use the table of electronegativities shown below to help
with the classification.
Portage Learning Chem 219 Principles of Organic Chemistry
Module 1 Exam
, a. Br and Br
b. K and Cl
c. P and Cl
d. C and O
e. Na and Br
CORR ANS:
a. covalent
b. Ionic
c. covalent
d. polar covalent
e. ionic
Answer:
a. Br-Br: Electronegativity difference ( ) = 0 = COVALENT (or
pure covalent)
b. K-Cl: ( ) = 2.2 = IONIC
c. P-Cl: ( )= 0.9 = POLAR COVALENT
d. C-O: ( )= 1.0 = POLAR COVALENT
e. Na-Br: ( ) = 1.8 = POLAR COVALENT
Portage Learning Chem 219 Principles of Organic Chemistry
Module 1 Exam
