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CHEM 219 2026 EXAM COMPLETE (104)
CURRENT TESTING QUESTIONS AND
DETAILED CORRECT
ANSWERS|GUARANTEED PASS.
CHEM 219
Prepare for the CHEM 219 Exam with this concise study resource
covering key chemistry concepts, including chemical reactions,
stoichiometry, thermodynamics, and molecular structure. It
reinforces foundational topics and includes exam-style
questions to support effective preparation. Suitable for students
studying general or organic chemistry at the undergraduate
level.
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.
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Oxygen
Carbon
Hydrogen
Nitrogen ✓ ✓ ...... 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
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
e. Na and Br ✓ ✓ ...... ANSWER ....... a. Br-Br:
Electronegativity difference () = 0 = COVALENT (or pure
covalent)
b. K-Cl: () = 2.2 = IONIC
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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. ✓ ✓ ...... ANSWER
....... 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: ✓ ✓
...... ANSWER ....... 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. ✓ ✓ ...... ANSWER ....... Different compounds
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that are not related. They have different MF - (a) C3H8O, (b)
C3H6O.
Identify each of the following carbon skeletons as linear
(continuous), branched, or cyclic. ✓ ✓ ...... ANSWER .......
a) Branched
b) Linear (continuous)
c) Cyclic
On a piece of scratch paper, write out structural formulae for
all of the constitutional isomers possible for the MF C3H6F2.
How many isomers are possible for this formula? ✓ ✓ ......
ANSWER ....... FOUR (shown below)
Characterize each of the following structural formula
representations as either a dash, condensed, super-
condensed, or bond-line formula: ✓ ✓ ...... ANSWER .......
a) Super-Condensed
b) Condensed
c) Bond-line
d) Dash
CHEM 219 2026 EXAM COMPLETE (104)
CURRENT TESTING QUESTIONS AND
DETAILED CORRECT
ANSWERS|GUARANTEED PASS.
CHEM 219
Prepare for the CHEM 219 Exam with this concise study resource
covering key chemistry concepts, including chemical reactions,
stoichiometry, thermodynamics, and molecular structure. It
reinforces foundational topics and includes exam-style
questions to support effective preparation. Suitable for students
studying general or organic chemistry at the undergraduate
level.
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.
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Oxygen
Carbon
Hydrogen
Nitrogen ✓ ✓ ...... 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
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
e. Na and Br ✓ ✓ ...... ANSWER ....... a. Br-Br:
Electronegativity difference () = 0 = COVALENT (or pure
covalent)
b. K-Cl: () = 2.2 = IONIC
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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. ✓ ✓ ...... ANSWER
....... 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: ✓ ✓
...... ANSWER ....... 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. ✓ ✓ ...... ANSWER ....... Different compounds
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that are not related. They have different MF - (a) C3H8O, (b)
C3H6O.
Identify each of the following carbon skeletons as linear
(continuous), branched, or cyclic. ✓ ✓ ...... ANSWER .......
a) Branched
b) Linear (continuous)
c) Cyclic
On a piece of scratch paper, write out structural formulae for
all of the constitutional isomers possible for the MF C3H6F2.
How many isomers are possible for this formula? ✓ ✓ ......
ANSWER ....... FOUR (shown below)
Characterize each of the following structural formula
representations as either a dash, condensed, super-
condensed, or bond-line formula: ✓ ✓ ...... ANSWER .......
a) Super-Condensed
b) Condensed
c) Bond-line
d) Dash
