Lewis Structures and Valence Electrons

The video tutorial explains how to write the Lewis structure for ethane (CH3CH3 or C2H6). It begins by introducing ethane and its chemical formula, then counts the valence electrons for carbon and hydrogen. The tutorial proceeds to demonstrate how to draw the Lewis structure, ensuring each atom satisfies the octet rule. It concludes with a discussion on shorthand notation and the molecular geometry of ethane.

What is another name for the compound CH3CH3?

• Butane

• Ethane

• Methane

• Propane

How many valence electrons does a single carbon atom contribute in ethane?

• 6

• 2

• 8

• 4

What is the total number of valence electrons in CH3CH3?

• 16

• 14

• 12

• 10

Where are hydrogen atoms placed in a Lewis structure?

• On the outside

• Randomly

• At the center

• Between carbon atoms

How many hydrogen atoms are bonded to each carbon in ethane?

• 4

• 1

• 2

• 3

How many electrons are used to form a single bond between atoms in the Lewis structure?

• 3

• 2

• 4

• 1

What is the octet rule in the context of Lewis structures?

• Atoms aim to have 12 electrons in their outer shell

• Atoms aim to have 10 electrons in their outer shell

• Atoms aim to have 6 electrons in their outer shell

• Atoms aim to have 8 electrons in their outer shell

Which of the following is a shorthand representation of the Lewis structure for ethane?

• H3C-CH3

• All of the above

• CH3-CH3

• C2H6

What does the two-dimensional nature of Lewis structures imply?

• They show the 3D shape of molecules

• They show the color of the molecule

• They do not show the 3D shape of molecules

• They show the molecular weight

In the molecular geometry of ethane, how are the hydrogen atoms arranged around each carbon?

• In a straight line

• In a triangular shape

• Spread out evenly

• Clustered on one side