Lewis Structures and Molecular Geometry

The video tutorial explains how to draw the Lewis structure for C2H4, also known as Ethane. It begins by calculating the total number of valence electrons using the Periodic Table. The tutorial then guides viewers through placing hydrogen atoms around carbon atoms and forming chemical bonds. It addresses the octet rule by showing how to form double bonds when necessary. The final structure is presented, highlighting the molecular geometry and the representation of double bonds.

What is the first step in drawing the Lewis structure for C2H4?

• Calculate the molecular geometry.

• Draw a double bond between carbon atoms.

• Place hydrogen atoms around carbon.

• Determine the total number of valence electrons.

How many valence electrons does each hydrogen atom contribute?

• Four

• Eight

• One

• Two

Where are hydrogen atoms placed in a Lewis structure?

• Between carbon atoms

• On the outside

• Next to each other

• In the center

What should be done if a central atom does not have an octet?

• Remove electrons

• Add more valence electrons

• Form double or triple bonds

• Add more hydrogen atoms

How many valence electrons are used in the final Lewis structure of C2H4?

• 16

• 14

• 12

• 10

How is a double bond represented in a Lewis structure?

• With a circle

• With two lines

• With a single line

• With a dotted line

What does the molecular geometry of C2H4 look like?

• A bent shape

• A tetrahedral shape

• A triangle

• A straight line