Lewis Structures and Molecular Composition

The video tutorial explains how to draw the Lewis structure for ethyl acetate (C4H8O2). It begins with an introduction to ethyl acetate and its molecular model. The video then describes the ethyl group and acetate ion, explaining how the acetate ion is derived from acetic acid. The tutorial proceeds to demonstrate the steps for drawing the Lewis structure, emphasizing the importance of valence electrons and the octet rule. Finally, the video verifies the structure by counting the total valence electrons and ensuring all atoms satisfy the octet rule.

What is the main focus of the video tutorial?

• Drawing the Lewis structure for water

• Explaining the properties of acetic acid

• Understanding the molecular model of ethyl acetate

• Discussing the uses of ethyl acetate

What is the ethyl group composed of?

• Two oxygen atoms

• Two carbon atoms joined by single bonds

• A carbon and an oxygen atom

• A hydrogen and a carbon atom

How is the acetate ion formed from acetic acid?

• By adding a carbon atom

• By replacing a hydrogen with an ethyl group

• By removing an oxygen atom

• By adding a hydrogen atom

In the Lewis structure, how many hydrogens are bonded to the carbon in the ethyl group?

• One

• Three

• Two

• Four

What assumption is made about carbon atoms in the Lewis structure?

• They are always double-bonded

• They do not form bonds with hydrogen

• They have four bonds, with missing ones assumed to be hydrogen

• They are always bonded to oxygen

Why are lone pairs added to the oxygen atoms in the Lewis structure?

• To reduce the number of valence electrons

• To increase the number of bonds

• To complete the octet rule

• To make the structure more complex

How many total valence electrons are used in the Lewis structure of ethyl acetate?

• 28

• 36

• 24

• 32

How many carbon atoms are present in the Lewis structure of ethyl acetate?

• Four

• Three

• Five

• Two

What is the total number of hydrogen atoms in ethyl acetate?

• Six

• Nine

• Eight

• Seven

What is the significance of counting valence electrons in the Lewis structure?

• To calculate the density

• To identify the number of bonds

• To ensure the structure is balanced

• To determine the molecular weight