The video tutorial explains how to write the Lewis structure for barium sulfate (BaSO4). It begins by identifying barium as a metal and sulfate as a polyatomic ion, forming an ionic compound. The tutorial details the process of electron transfer from barium to the sulfate ion, resulting in a two-plus charge for barium and a two-minus charge for sulfate. The video also describes the concept of a formula unit and how barium sulfate forms a crystal structure with repeating units.

What is the role of barium in the compound barium sulfate?

• It acts as a non-metal.

• It gains electrons from sulfate.

• It forms a covalent bond.

• It transfers electrons to sulfate.

What type of ion is sulfate in the compound barium sulfate?

• Monatomic ion

• Polyatomic ion

• Cation

• Anion

How many valence electrons does barium have to transfer?

• Three

• Two

• Four

• One

What charge does barium acquire after transferring its electrons?

• 2-

• 1+

• 2+

• 1-

What is the charge on the sulfate ion after gaining electrons?

• 1-

• 2+

• 1+

• 2-

Why are brackets used in the Lewis structure of barium sulfate?

• To show shared electrons

• To indicate electron transfer

• To denote molecular geometry

• To highlight covalent bonds

What distinguishes ionic bonds from covalent bonds in the context of barium sulfate?

• Covalent bonds involve ion formation.

• Ionic bonds involve electron transfer.

• Covalent bonds involve electron transfer.

• Ionic bonds involve electron sharing.

What is a formula unit in the context of barium sulfate?

• An isolated ion

• A single molecule

• A repeating pattern in a crystal

• A covalent bond

What type of structure does barium sulfate form?

• Amorphous

• Liquid

• Gaseous

• Crystalline