Chemical Reactions and Ionic Charges

The video tutorial explains the reaction between calcium oxide (CaO) and water (H2O) to form calcium hydroxide (Ca(OH)2). It describes this as a combination or synthesis reaction, where two substances combine to form a new compound. The video also discusses the charges of the elements involved, using the periodic table to explain why calcium has a 2+ charge and hydroxide has a 1- charge. The tutorial concludes by reinforcing the concept of synthesis reactions.

What type of reaction occurs when calcium oxide reacts with water?

• Double displacement

• Combination

• Single displacement

• Decomposition

Which of the following best describes the role of calcium in the reaction with water?

• It provides a 2+ charge.

• It acts as a catalyst.

• It remains unchanged.

• It is a non-metal.

What is the charge of oxygen in calcium oxide?

• 1+

• 2+

• 1-

• 2-

Why don't we worry about the charge of water in this reaction?

• Water is a covalent compound.

• Water is an ionic compound.

• Water is a metal.

• Water has a neutral charge.

What is the charge of hydroxide in calcium hydroxide?

• 2-

• 2+

• 1-

• 1+

How many hydroxide ions are needed to balance the charge of one calcium ion in calcium hydroxide?

• One

• Two

• Three

• Four

What is the final product of the reaction between calcium oxide and water?

• Calcium sulfate

• Calcium hydroxide

• Calcium chloride

• Calcium carbonate

What is another name for a combination reaction?

• Redox reaction

• Displacement reaction

• Synthesis reaction

• Decomposition reaction