Valence Electrons and Lewis Structures

The video tutorial explains the Lewis structure of ethanol (CH3CH2OH or C2H5OH). It begins by introducing the molecule and its total of 20 valence electrons. The instructor demonstrates how to write the skeleton structure and form chemical bonds, using 16 valence electrons. The remaining electrons are placed around the oxygen atom to complete the structure, ensuring each atom has a full outer shell. The tutorial concludes with a review of the completed Lewis structure, highlighting that all atoms have satisfied the octet rule.

What is another name for the compound CH3CH2OH?

• Methanol

• Ethanol

• Butanol

• Propanol

How many total valence electrons are present in the Lewis structure of ethanol?

• 22

• 18

• 24

• 20

What is the purpose of drawing lines between atoms in a Lewis structure?

• To represent atomic mass

• To show chemical bonds

• To display molecular weight

• To indicate electron spin

How many valence electrons are used to form chemical bonds in the initial skeleton structure of ethanol?

• 18

• 16

• 14

• 12

What is the significance of the octet rule in the Lewis structure of ethanol?

• It calculates the molecular weight

• It ensures atoms have full outer shells

• It predicts the boiling point

• It determines the molecular shape

How many valence electrons does each hydrogen atom have in the ethanol Lewis structure?

• Three

• Four

• Two

• One