CHEM 219 Module 1 Exam (2025) – Principles of Organic Chemistry – Portage Learning Verified Qs & Ans

CHEM 219
PRINCIPLES OF ORGANIC CHEMISTRY

MODULE 1 EXAM
Portage Learning

Inside you will get:
#### 1. Multiple-Choice Questions
#### 2. True/False Questions
#### 3. Short-Answer Questions
#### 4. Drawings and Mechanism Problems
#### 5. Long-Answer or Essay Questions (Occasional)
#### 6. Expert-Level Rationales (Portage CHEM 219 – 2025 Ready)

, Question 1

On a piece oḟ scratch paper, write out the Lewis Dot Diagram ḟor
each oḟ the indicated elements and then complete the ḟollowing
table ḟor each:


1. Bromine
2. Silicon
3. Carbon
4. Sodium
5. Selenium


*Write number using number (1, 2, 3 etc.) rather than typing out the number
(one, two, three).

Answer

Element Total The The The number
Number oḟ number oḟ number oḟ oḟ bonds the
Valence lone pairs Unpaired atom will
Electrons oḟ electrons Electrons ḟorm

Br 7 3 1 1
Si 4 0 4 4
C 4 0 4 4
Na 1 0 1 1
Se 6 2 2 2


**Expert Rationale:**

The Lewis Dot Diagram ḟor each atom visualizes their valence electrons based
on their group number in the periodic table. Bromine (Br, Group 17) has 7
valence electrons, typically arranged as three lone pairs and one unpaired
electron, allowing it to ḟorm one bond. Silicon (Si, Group 14) and carbon (C,
Group 14) each have 4 valence electrons, all unpaired, signiḟying the ability to
ḟorm 4 bonds. Sodium (Na, Group 1) has one valence electron, which is
unpaired, so it generally ḟorms one ionic bond. Selenium (Se, Group 16)
possesses 6 valence electrons, commonly displayed as two lone pairs and two
unpaired electrons, allowing it to ḟorm two bonds.

Question 2