CHEM 219 Module 1 problem set Exam
Questions and Answers (Latest 2026)
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.
Oxygen
Carbon
Hydrogen
Nitrogen - Correct Answers ✅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
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.
a. Br and Br
b. K and Cl
c. P and Cl
d. C and O
, CHEM 219 Module 1 problem set Exam
Questions and Answers (Latest 2026)
e. Na and Br - Correct Answers ✅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
Define the term constitutional isomer. - Correct Answers
✅Two (or more) different chemical compounds with the same
molecular formula but different connectivity between the
atoms in their structural formulae.
Explain (using specific evidence) what makes the following
two compounds constitutional isomers of one another: -
Correct Answers ✅Both compounds have a MF of C3H6O -
same MF.
Compound "a" has a 3-carbon chain with a C=O in the
middle. No H atom connected to C of C=O.
Compound "b" has a 3-carbon chain with a C=O at the end.
There is an H attached to the C of the C=O.
What is the relationship between the compounds shown? Are
they the same compound, constitutional isomers, or two
different compounds that are not related to one another?
Explain. - Correct Answers ✅Different compounds that are
not related. They have different MF - (a) C3H8O, (b) C3H6O.
Questions and Answers (Latest 2026)
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.
Oxygen
Carbon
Hydrogen
Nitrogen - Correct Answers ✅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
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.
a. Br and Br
b. K and Cl
c. P and Cl
d. C and O
, CHEM 219 Module 1 problem set Exam
Questions and Answers (Latest 2026)
e. Na and Br - Correct Answers ✅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
Define the term constitutional isomer. - Correct Answers
✅Two (or more) different chemical compounds with the same
molecular formula but different connectivity between the
atoms in their structural formulae.
Explain (using specific evidence) what makes the following
two compounds constitutional isomers of one another: -
Correct Answers ✅Both compounds have a MF of C3H6O -
same MF.
Compound "a" has a 3-carbon chain with a C=O in the
middle. No H atom connected to C of C=O.
Compound "b" has a 3-carbon chain with a C=O at the end.
There is an H attached to the C of the C=O.
What is the relationship between the compounds shown? Are
they the same compound, constitutional isomers, or two
different compounds that are not related to one another?
Explain. - Correct Answers ✅Different compounds that are
not related. They have different MF - (a) C3H8O, (b) C3H6O.
