Hydroxide Ion and Barium Concepts

This video tutorial explains the reaction between barium hydroxide and water. It begins by introducing the components of the reaction, barium hydroxide and water, and discusses the nature of barium as a metal and hydroxide as a polyatomic ion. The video then explores the ionic charges of barium and hydroxide, using the periodic table and a table of common polyatomic ions. It describes how barium hydroxide dissociates in water, forming barium ions and hydroxide ions, and explains the significance of the aqueous state. Finally, the video demonstrates how to write the chemical equation for the reaction, emphasizing the importance of balancing the equation and understanding the role of each component.

What type of ion is hydroxide considered to be?

• Anion

• Polyatomic ion

• Cation

• Monatomic ion

Which group in the periodic table does barium belong to?

• Group 4

• Group 3

• Group 2

• Group 1

What is the ionic charge of barium?

• 2-

• 2+

• 1+

• 1-

What is the charge of the hydroxide ion?

• 1+

• 2+

• 2-

• 1-

What happens to barium hydroxide when it is added to water?

• It forms a precipitate

• It evaporates

• It dissociates into ions

• It remains unchanged

How many hydroxide ions are produced from one formula unit of barium hydroxide?

• Four

• Three

• Two

• One

What does 'aq' signify when writing chemical equations?

• Aqueous or dissolved in water

• Liquid state

• Solid state

• Gaseous state

Why is it unnecessary to write H2O on the product side of the equation?

• Because it is already implied

• Because it is a catalyst

• Because it is not involved in the reaction

• Because it is a reactant