Barium Compounds and Hydroxide Ions

The video tutorial explains how to name and write the formula for Ba(OH)2, known as barium hydroxide. It begins by identifying the hydroxide group (OH) as a polyatomic ion bonded to a metal, barium. The tutorial details the naming process, starting with the metal's name followed by the polyatomic ion, resulting in 'barium hydroxide.' It also covers writing the chemical formula, emphasizing the ionic charges: barium with a 2+ charge and hydroxide with a 1- charge, requiring two hydroxide ions to balance. Finally, it notes that barium hydroxide is a base due to the presence of the hydroxide group.

What is the name of the OH group when it is bonded to a metal?

• Oxygen ion

• Hydroxide ion

• Oxide ion

• Peroxide ion

Which element is represented by 'Ba' in the compound Ba(OH)2?

• Beryllium

• Bismuth

• Barium

• Boron

What is the ionic charge of barium in Ba(OH)2?

• 1-

• 2+

• 1+

• 2-

How many hydroxide ions are needed to balance the charge of one barium ion in Ba(OH)2?

• One

• Two

• Four

• Three

Which group on the periodic table does barium belong to?

• Group 1

• Group 2

• Group 3

• Group 4

What type of compound is Ba(OH)2 due to the presence of the hydroxide group?

• Acid

• Oxide

• Salt

• Base