Lewis Structures and Molecular Geometry

The video tutorial explains how to draw the Lewis structure for C2H2, also known as acetylene or ethyne. It begins by counting the total number of valence electrons using the periodic table, identifying carbon and hydrogen's valence electrons. The tutorial then guides through placing atoms, forming initial bonds, and completing octets for carbon atoms. It explains the process of forming triple bonds to satisfy the octet rule. Finally, the video discusses the molecular geometry of C2H2, which is linear with a bond angle of 180 degrees, and concludes the tutorial.

What is the total number of valence electrons in C2H2?

• 8

• 12

• 10

• 14

How many valence electrons does each carbon atom have in C2H2?

• 6

• 8

• 2

• 4

Which atom is typically placed in the center of a Lewis structure?

• Oxygen

• Hydrogen

• The least electronegative atom

• The most electronegative atom

How many valence electrons are used initially to form bonds in C2H2?

• 2

• 4

• 8

• 6

Why do hydrogen atoms not require a full octet in Lewis structures?

• They are highly electronegative

• They only need two valence electrons

• They form ionic bonds

• They are too small

What adjustment is made if the central atom does not have a full octet?

• Add more electrons

• Change the atom

• Form double or triple bonds

• Remove electrons

What is the molecular geometry of C2H2?

• Tetrahedral

• Trigonal planar

• Linear

• Bent

What is the bond angle in a linear molecular geometry?

• 360 degrees

• 120 degrees

• 180 degrees

• 90 degrees

How is a triple bond represented in a Lewis structure?

• Three lines

• No lines

• One line

• Two lines

What is another name for acetylene?

• Ethane

• Ethyne

• Ethene

• Ethanol