Lewis Dot Structure Practice: Step-by-Step Guide

This video tutorial explains how to draw Lewis structures for various molecules, including OF2, CH4, H2, CO2, BH3, O3, NH4+, SO4 2-, and PO4 3-. It covers the calculation of valence electrons, the placement of atoms, and the formation of chemical bonds. The video also discusses exceptions to the octet rule, resonance structures, and the concept of expanded octets for certain elements. The tutorial provides a step-by-step guide to ensure each atom achieves a stable electron configuration.

What is a single bond in a Lewis structure?

• A single electron shared between three atoms

• A single electron shared between two atoms

• A pair of electrons shared between two atoms

• A pair of electrons shared between three atoms

How many valence electrons does oxygen have in the OF2 Lewis structure?

• 10

• 6

• 4

• 8

In the CH4 Lewis structure, how many valence electrons does carbon have?

• 2

• 4

• 6

• 8

How many valence electrons are used in the H2 Lewis structure?

• 4

• 1

• 3

• 2

What is the total number of valence electrons in the CO2 Lewis structure?

• 16

• 18

• 14

• 12

How many valence electrons does boron need in the BH3 Lewis structure?

• 10

• 6

• 4

• 8

What are resonance structures in Lewis structures?

• Structures with different bonds

• Structures with different valence electrons

• Structures with different atoms

• Different ways to draw the same Lewis structure

What does a plus sign indicate in a Lewis structure?

• The compound has gained an electron

• The compound has lost an electron

• The compound has gained a proton

• The compound has lost a proton

What is an expanded octet?

• When an atom has no valence electrons

• When an atom has less than eight valence electrons

• When an atom has more than eight valence electrons

• When an atom has exactly eight valence electrons

Why should formal charges be checked in advanced Lewis structures?

• To ensure the structure is favorable

• To ensure the structure is stable

• To ensure the structure is correct

• To ensure the structure is balanced