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

CHEM 219
PRINCIPLES OF ORGANIC CHEMISTRY

MODULE 1 EXAM
Portage Learning

Inside you will get:
#### l. 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-Leṿel Rationales (Portage CHEM 2l9 – 2025 Ready)

, Ǫuestion 1
On a piece of scratch paper, write out the Lewis Dot Diagram for
each of the indicated elements and then complete the following
table for each:


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



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

Element Total The The The number
Number number of number of bonds
of lone pairs of the atom
Ṿalence of Unpaired will form
Electron electrons Electrons
s
Br 7 3 l l
Si 4 0 4 4
C 4 0 4 4

Na l 0 l l
Se 6 2 2 2


**Expert Rationale:**
The Lewis Dot Diagram for each atom ṿisualizes their ṿalence
electrons based on their group number in the periodic table.
Bromine (Br, Group l7) has 7 ṿalence electrons, typically arranged
as three lone pairs and one unpaired electron, allowing it to form
one bond. Silicon (Si, Group l4) and carbon (C, Group l4) each
haṿe 4 ṿalence electrons, all unpaired, signifying the ability to form
4 bonds. Sodium (Na, Group l) has one ṿalence electron, which is
unpaired, so it generally forms one ionic bond. Selenium (Se,
Group l6)