CHEM 219 COMPLETE PACKAGE DEAL
2026/2027 | Modules 1-8 Exams, Final
Exam & Lab Reports Experiments 1-8
| Portage Learning Organic Chemistry
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Question 1: On a piece of scratch paper, write out the Lewis Dot Diagram for each
of the indicated elements and determine the number of Lone Pairs and Unpaired
Electrons in the valence shell.
A) Element X has 2 lone pairs and 2 unpaired electrons
B) Element X has 3 lone pairs and 1 unpaired electron
C) Element X has 4 lone pairs and 0 unpaired electrons
D) Element X has 1 lone pair and 3 unpaired electrons
Correct Answer: A
Rationale: This depends on the specific element's valence electron configuration. The
Lewis dot diagram shows valence electrons as dots; lone pairs are pairs of dots not
involved in bonding, and unpaired electrons are single dots available for bonding.
Question 2: The Lewis dot diagram for an atom can be used to predict:
,A) The number of bonds the atom can form
B) The molecular weight of the atom
C) The number of neutrons in the nucleus
D) The melting point of the element
Correct Answer: A
Rationale: The Lewis dot diagram shows valence electrons, which determine the atom's
bonding capacity. Unpaired electrons can participate in bond formation with other
atoms.
SECTION 2: MODULE 2 EXAM – HYDROCARBONS &
NOMENCLATURE
Question 3: What are hydrocarbons?
A) Molecules composed of carbon and oxygen
B) Molecules composed of only carbon and hydrogen
C) Molecules composed of carbon and nitrogen
D) Molecules composed of hydrogen and oxygen
Correct Answer: B
Rationale: Hydrocarbons are molecules composed of only the elements carbon and
hydrogen. They are the simplest class of organic compounds and are primarily derived
from fossil fuels like coal, petroleum, and natural gas.
Question 4: What are the two major classes of hydrocarbons?
A) Saturated and unsaturated
B) Aromatic and aliphatic
C) Linear and branched
D) Cyclic and acyclic
Correct Answer: B
Rationale: The two major classes of hydrocarbons are aromatic (benzene derivatives)
and aliphatic, which include alkanes, alkenes, and alkynes.
, Question 5: What are alkanes?
A) Unsaturated hydrocarbons with C=C bonds
B) Saturated hydrocarbons composed only of C-C single bonds
C) Hydrocarbons with a benzene ring
D) Hydrocarbons with C≡C bonds
Correct Answer: B
Rationale: Alkanes are saturated hydrocarbons because their skeleton is composed only
of C-C single bonds. They can be linear, branched, or exist in ring formations called
cycloalkanes.
Question 6: What is the general formula of alkanes?
A) CnH2n
B) CnH2n+2
C) CnH2n-2
D) CnHn
Correct Answer: B
Rationale: The general formula of acyclic alkanes is CnH2n+2. For example, methane is
CH4, ethane is C2H6, and propane is C3H8.
Question 7: Name the first four prefixes for alkanes:
A) Methane, ethane, propane, butane
B) Methane, propane, ethane, butane
C) Methane, ethane, butane, propane
D) Ethane, methane, propane, butane
Correct Answer: A
Rationale: The correct order of the first four alkane prefixes is methane (C1), ethane
(C2), propane (C3), and butane (C4).
2026/2027 | Modules 1-8 Exams, Final
Exam & Lab Reports Experiments 1-8
| Portage Learning Organic Chemistry
Bundle | Verified Q&A | Pass
Guaranteed - A+ Graded
Question 1: On a piece of scratch paper, write out the Lewis Dot Diagram for each
of the indicated elements and determine the number of Lone Pairs and Unpaired
Electrons in the valence shell.
A) Element X has 2 lone pairs and 2 unpaired electrons
B) Element X has 3 lone pairs and 1 unpaired electron
C) Element X has 4 lone pairs and 0 unpaired electrons
D) Element X has 1 lone pair and 3 unpaired electrons
Correct Answer: A
Rationale: This depends on the specific element's valence electron configuration. The
Lewis dot diagram shows valence electrons as dots; lone pairs are pairs of dots not
involved in bonding, and unpaired electrons are single dots available for bonding.
Question 2: The Lewis dot diagram for an atom can be used to predict:
,A) The number of bonds the atom can form
B) The molecular weight of the atom
C) The number of neutrons in the nucleus
D) The melting point of the element
Correct Answer: A
Rationale: The Lewis dot diagram shows valence electrons, which determine the atom's
bonding capacity. Unpaired electrons can participate in bond formation with other
atoms.
SECTION 2: MODULE 2 EXAM – HYDROCARBONS &
NOMENCLATURE
Question 3: What are hydrocarbons?
A) Molecules composed of carbon and oxygen
B) Molecules composed of only carbon and hydrogen
C) Molecules composed of carbon and nitrogen
D) Molecules composed of hydrogen and oxygen
Correct Answer: B
Rationale: Hydrocarbons are molecules composed of only the elements carbon and
hydrogen. They are the simplest class of organic compounds and are primarily derived
from fossil fuels like coal, petroleum, and natural gas.
Question 4: What are the two major classes of hydrocarbons?
A) Saturated and unsaturated
B) Aromatic and aliphatic
C) Linear and branched
D) Cyclic and acyclic
Correct Answer: B
Rationale: The two major classes of hydrocarbons are aromatic (benzene derivatives)
and aliphatic, which include alkanes, alkenes, and alkynes.
, Question 5: What are alkanes?
A) Unsaturated hydrocarbons with C=C bonds
B) Saturated hydrocarbons composed only of C-C single bonds
C) Hydrocarbons with a benzene ring
D) Hydrocarbons with C≡C bonds
Correct Answer: B
Rationale: Alkanes are saturated hydrocarbons because their skeleton is composed only
of C-C single bonds. They can be linear, branched, or exist in ring formations called
cycloalkanes.
Question 6: What is the general formula of alkanes?
A) CnH2n
B) CnH2n+2
C) CnH2n-2
D) CnHn
Correct Answer: B
Rationale: The general formula of acyclic alkanes is CnH2n+2. For example, methane is
CH4, ethane is C2H6, and propane is C3H8.
Question 7: Name the first four prefixes for alkanes:
A) Methane, ethane, propane, butane
B) Methane, propane, ethane, butane
C) Methane, ethane, butane, propane
D) Ethane, methane, propane, butane
Correct Answer: A
Rationale: The correct order of the first four alkane prefixes is methane (C1), ethane
(C2), propane (C3), and butane (C4).
